Species Report
9108 Records
Here are all the species that match your criteria. Please click on the the Scientific Name to find out more about the particular species.
| Inverted Common Name | Scientific Name | Where Listed | Lead Region | Listing Status |
|---|---|---|---|---|
| Abalone, Black | Haliotis cracherodii | Entire | NMFS | E |
| Abalone, White | Haliotis sorenseni | North America (West Coast from Point Conception, CA, U.S.A., to Punta Abreojos, Baja California, Mexico) | NMFS | E |
| Acacia, Emory | Acacia emoryana | 2 | Not Listed | |
| Acornshell | Epioblasma haysiana | Entire | 4 | Not Listed |
| Acornshell, southern | Epioblasma othcaloogensis | Entire | 4 | E |
| Addax | Addax nasomaculatus | Entire | Foreign | E |
| Adder's-mouth | Malaxis brachypoda | 1 | Not Listed | |
| Adder's-tongue, California | Ophioglossum lusitanicum | 1 | Not Listed | |
| Adder's-tongue, [unnamed] | Ophioglossum concinnum | 1 | Not Listed | |
| Adjutant, greater | Leptoptilos dubius | Entire | 9 | E |
| Admiral, Nevada | Limenitus weidemeyerii nevadae | Entire | 1 | Not Listed |
| Adobe-lily, greenhorn | Fritillaria striata | 1 | Not Listed | |
| Adobe-lily, [unnamed] | Fritillaria pluriflora | 1 | Not Listed | |
| adolphia, California | Adolphia californica | 8 | Not Listed | |
| A`e | Zanthoxylum dipetalum var. tomentosum | 1 | E | |
| A`e | Zanthoxylum hawaiiense | 1 | E | |
| A`e | Zanthoxylum oahuense | 1 | PE | |
| A`e | Zanthoxylum semiarticulatum | 1 | Not Listed | |
| A`e | Zanthoxylum skottsbergii | 1 | Not Listed | |
| Agastache, small-leaved | Agastache parvifolia | 1 | Not Listed | |
| Agave, Arizona | Agave arizonica | 2 | DO | |
| Agave, Chisos | Agave glomeruliflora | 2 | Not Listed | |
| Agave, Clark Mountains | Agave utahensis nevadensis | 1 | Not Listed | |
| Agave, ivory-spined | Agave utahensis eborispina | 1 | Not Listed | |
| Agave, Santa Cruz striped | Agave parviflora parviflora | 2 | Not Listed | |
| Agave, Shaw's | Agave shawii | 1 | Not Listed | |
| Agave, sp. nov. ined. (Tonto Basin) | Agave sp. | 2 | Not Listed | |
| `Ahakea | Bobea sandwicensis | 1 | Not Listed | |
| `Ahakea | Bobea timonioides | 1 | Not Listed | |
| `Ahinahina | Argyroxiphium sandwicense ssp. macrocephalum | 1 | T | |
| `Ahinahina | Argyroxiphium sandwicense ssp. sandwicense | 1 | E | |
| `Aiakeakua, popolo | Solanum sandwicense | 1 | E | |
| `Aiea | Nothocestrum breviflorum | 1 | E | |
| `Aiea | Nothocestrum latifolium | 1 | C | |
| `Aiea | Nothocestrum longifolium rufipilosum | 1 | Not Listed | |
| `Aiea | Nothocestrum peltatum | 1 | E | |
| Akekee | Loxops caeruleirostris | Entire | 1 | E |
| Akepa, Hawaii (honeycreeper) | Loxops coccineus coccineus | Entire | 1 | E |
| Akepa, Maui (honeycreeper) | Loxops coccineus ochraceus | Entire | 1 | E |
| Akialoa, Kauai (honeycreeper) | Hemignathus procerus | Entire | 1 | E |
| Akiapola`au (honeycreeper) | Hemignathus munroi | Entire | 1 | E |
| Akikiki | Oreomystis bairdi | Entire | 1 | E |
| `Akoko | Chamaesyce arnottiana | 1 | Not Listed | |
| `Akoko | Chamaesyce atrococca | 1 | Not Listed | |
| `Akoko | Chamaesyce celastroides tomentella | 1 | Not Listed | |
| `Akoko | Chamaesyce celastroides var. kaenana | 1 | E | |
| `Akoko | Chamaesyce deppeana | 1 | E | |
| `Akoko | Chamaesyce eleanoriae | 1 | E | |
| `Akoko | Chamaesyce herbstii | 1 | E | |
| `Akoko | Chamaesyce kuwaleana | 1 | E | |
| `Akoko | Chamaesyce olowaluana | 1 | Not Listed | |
| `Akoko | Chamaesyce remyi hanaleiensis | 1 | Not Listed | |
| `Akoko | Chamaesyce remyi var. kauaiensis | 1 | E | |
| `Akoko | Chamaesyce remyi var. remyi | 1 | E | |
| `Akoko | Chamaesyce rockii | 1 | E | |
| `Akoko | Chamaesyce skottsbergii vaccinioides | 1 | Not Listed | |
| `Akoko | Chamaesyce sparsiflora | 1 | Not Listed | |
| `Akoko | Euphorbia haeleeleana | 1 | E | |
| `Akoko, Ewa Plains | Chamaesyce skottsbergii var. kalaeloana | 1 | E | |
| `aku | Cyanea tritomantha | 1 | C | |
| Ala`a | Pouteria auahiensis | 1 | Not Listed | |
| Ala`a | Pouteria hotteana | 4 | Not Listed | |
| Ala`a | Pouteria rhynchosperma | 1 | Not Listed | |
| `Ala `ala wai nui | Peperomia subpetiolata | 1 | C | |
| Ala balik (trout) | Salmo platycephalus | Entire | Foreign | E |
| Alani | Melicope adscendens | 1 | E | |
| Alani | Melicope balloui | 1 | E | |
| Alani | Melicope christophersenii | 1 | PE | |
| Alani | Melicope cruciata | 1 | Not Listed | |
| Alani | Melicope degeneri | 1 | E | |
| Alani | Melicope haleakalae | 1 | Not Listed | |
| Alani | Melicope haupuensis | 1 | E | |
| Alani | Melicope hawaiensis | 1 | Not Listed | |
| Alani | Melicope hiiakae | 1 | PE | |
| Alani | Melicope kavaiensis | 1 | Not Listed | |
| Alani | Melicope knudsenii | 1 | E | |
| Alani | Melicope lydgatei | 1 | E | |
| Alani | Melicope macropus | 1 | Not Listed | |
| Alani | Melicope makahae | 1 | PE | |
| Alani | Melicope mucronulata | 1 | E | |
| Alani | Melicope munroi | 1 | E | |
| Alani | Melicope nealae | 1 | Not Listed | |
| Alani | Melicope obovata | 1 | Not Listed | |
| Alani | Melicope orbicularis | 1 | Not Listed | |
| Alani | Melicope ovalis | 1 | E | |
| Alani | Melicope ovata | 1 | Not Listed | |
| Alani | Melicope pallida | 1 | E | |
| Alani | Melicope paniculata | 1 | E | |
| Alani | Melicope puberula | 1 | E | |
| Alani | Melicope quadrangularis | 1 | E | |
| Alani | Melicope reflexa | 1 | E | |
| Alani | Melicope saint-johnii | 1 | E | |
| Alani | Melicope sandwicensis | 1 | Not Listed | |
| Alani | Melicope wailauensis | 1 | Not Listed | |
| Alani | Melicope zahlbruckneri | 1 | E | |
| Albatross, Amsterdam | Diomedia amsterdamensis | Entire | Foreign | E |
| Albatross, black-footed | Phoebastria nigripes | Entire | 1 | Not Listed |
| Albatross, short-tailed | Phoebastria (=Diomedea) albatrus | Entire | 7 | E |
| Alder, seaside | Alnus maritima | 5 | Not Listed | |
| Alethe, Thyolo | Alethe choloensis | Entire | Foreign | E |
| Algodoncillo | Psiguria cookiana | 4 | Not Listed | |
| Alice-flower, wonderland | Aliciella (=Gilia) cespitosa | 6 | Not Listed | |
| Alkali grass, Howell's | Puccinellia howellii | 1 | Not Listed | |
| Alkali grass, Parish's | Puccinellia parishii | 2 | Not Listed | |
| Alkali grass, [unnamed] | Puccinellia triflora | 7 | Not Listed | |
| Alligator, American | Alligator mississippiensis | Entire | 4 | SAT |
| Alligator, Chinese | Alligator sinensis | Entire | Foreign | E |
| Allocarya, Calistoga | Plagiobothrys strictus | 8 | E | |
| Allocarya, Cedar Crest | Plagiobothrys glyptocarpus modestus | 1 | Not Listed | |
| Allocarya, glabrous | Plagiobothrys glaber | 1 | Not Listed | |
| Allocarya, scribe | Plagiobothrys scriptus | 1 | Not Listed | |
| Alopecurus, Sonoma | Alopecurus aequalis var. sonomensis | 8 | E | |
| Alumroot, Duran's | Heuchera duranii | 1 | Not Listed | |
| Alumroot, island | Heuchera maxima | 1 | Not Listed | |
| Alumroot, Laguna | Heuchera brevistaminea | 1 | Not Listed | |
| alumroot, shaggyhair | Heuchera hirsutissima | 1 | Not Listed | |
| Alumroot, [unnamed] | Heuchera americana hispida | 5 | Not Listed | |
| Amaranth, seabeach | Amaranthus pumilus | 4 | T | |
| Ambersnail, Kanab | Oxyloma haydeni kanabensis | Entire | 6 | E |
| Ambrosia, San Diego | Ambrosia pumila | 8 | E | |
| Ambrosia, south Texas | Ambrosia cheiranthifolia | 2 | E | |
| Ambrosia, [unnamed] | Ambrosia linearis | 6 | Not Listed | |
| Amole, purple | Chlorogalum purpureum | 8 | T | |
| Amorpha, Texas | Amorpha roemeriana | 2 | Not Listed | |
| Amphianthus, little | Amphianthus pusillus | 4 | T | |
| Amphipod, Alabama well | Stygobromus smithi | Entire | 4 | Not Listed |
| Amphipod, Allegheny cave | Stygobromus allegheniensis | Entire | 5 | Not Listed |
| Amphipod, anomalous spring | Crangonyx anomalus | Entire | 3 | Not Listed |
| Amphipod, Appalachian Valley cave | Crangonyx antennatus | Entire | 4 | Not Listed |
| Amphipod, Arizona cave | Stygobromus arizonensis | Entire | 2 | UR |
| Amphipod, Balcones cave | Stygobromus balconis | Entire | 2 | Not Listed |
| Amphipod, Barr's cave | Stygobromus barri | Entire | 3 | Not Listed |
| Amphipod, Bath County cave | Stygobromus mundus | Entire | 5 | Not Listed |
| Amphipod, bifurcated cave | Stygobromus bifurcatus | Entire | 2 | Not Listed |
| Amphipod, Bigger's | Stygobromus biggersi | Entire | 5 | Not Listed |
| Amphipod, Bousfield's | Gammarus bousfieldi | Entire | 4 | Not Listed |
| Amphipod, Bowman's cave | Stygobromus bowmani | Entire | 2 | Not Listed |
| Amphipod, Burnsville Cove cave | Stygobromus conradi | Entire | 5 | Not Listed |
| Amphipod, Cascade Cave | Stygobromus dejectus | Entire | 2 | Not Listed |
| Amphipod, cave | Stygobromus phreaticus | Entire | NA | Not Listed |
| Amphipod, Central Kentucky cave | Stygobromus exilis | Entire | 4 | Not Listed |
| Amphipod, Central Missouri cave | Allocrangonyx hubrichti | Entire | 3 | Not Listed |
| Amphipod, Clanton's cave | Stygobromus clantoni | Entire | 6 | Not Listed |
| Amphipod, Cooper's cave | Stygobromus cooperi | Entire | 5 | Not Listed |
| Amphipod, Culver's cave | Stygobromus culveri | Entire | 5 | Not Listed |
| Amphipod, Dearolf's cave | Crangonyx dearolfi | Entire | 5 | Not Listed |
| Amphipod, Devil's Sinkhole | Stygobromus hadenoecus | Entire | 2 | Not Listed |
| Amphipod, diminutive | Gammarus hyalleloides | Entire | 2 | C |
| Amphipod, Elevated Spring | Stygobromus elatus | Entire | 4 | Not Listed |
| Amphipod, Ephemeral cave | Stygobromus ephemerus | Entire | 5 | Not Listed |
| Amphipod, Ezell's Cave | Stygobromus flagellatus | Entire | 2 | Not Listed |
| Amphipod, Florida cave | Crangonyx grandimanus | Entire | 4 | Not Listed |
| Amphipod, Franz's | Stygobromus franzi | Entire | 5 | Not Listed |
| Amphipod, Grady's cave | Stygobromus gradyi | Entire | 1 | UR |
| Amphipod, Greenbrier Cave | Stygobromus emarginatus | Entire | 5 | Not Listed |
| Amphipod, Hara's cave | Stygobromus harai | Entire | 1 | UR |
| Amphipod, Hay's Spring | Stygobromus hayi | Entire | 5 | E |
| Amphipod, Hobb's cave | Crangonyx hobbsi | Entire | 4 | Not Listed |
| Amphipod, Illinois cave | Gammarus acherondytes | Entire | 3 | E |
| Amphipod, Iowa | Stygobromus iowae | Entire | 3 | Not Listed |
| Amphipod, Kansas well | Bactrurus hubrichti | Entire | 2 | Not Listed |
| Amphipod, Kauai cave | Spelaeorchestia koloana | Entire | 1 | E |
| Amphipod, Kenk's | Stygobromus kenki | Entire | 5 | C |
| Amphipod, long-legged cave | Stygobromus longipes | Entire | 2 | Not Listed |
| Amphipod, MacKenzie's cave | Stygobromus mackenziei | Entire | 1 | UR |
| Amphipod, Malheur Cave | Stygobromus hubbsi | Entire | 1 | UR |
| Amphipod, Minor cave | Crangonyx minor | Entire | 3 | Not Listed |
| Amphipod, minute cave | Stygobromus parvus | Entire | 5 | Not Listed |
| Amphipod, Morrison's cave | Stygobromus morrisoni | Entire | 5 | Not Listed |
| Amphipod, mountain cave | Stygobromus montanus | Entire | 4 | Not Listed |
| Amphipod, Noel's | Gammarus desperatus | Entire | 2 | E |
| Amphipod, Norton's cave | Stygobromus nortoni | Entire | 4 | Not Listed |
| Amphipod, Oklahoma cave | Allocrangonyx pellucidus | Entire | 2 | Not Listed |
| Amphipod, Onondaga Cave | Stygobromus onondagaensis | Entire | 3 | Not Listed |
| Amphipod, Oregon cave | Stygobromus oregonensis | Entire | 1 | Not Listed |
| Amphipod, Ozark cave | Stygobromus ozarkensis | Entire | 3 | Not Listed |
| Amphipod, Packard's cave | Crangonyx packardi | Entire | 3 | Not Listed |
| Amphipod, Peck's cave | Stygobromus (=Stygonectes) pecki | Entire | 2 | E |
| Amphipod, Pecos | Gammarus pecos | Entire | 2 | Not Listed |
| Amphipod, Pickle Springs | Stygobromus heteropodus | Entire | 3 | Not Listed |
| Amphipod, Pizzini's | Stygobromus pizzinii | Entire | 5 | Not Listed |
| Amphipod, Pocahontas cave | Stygobromus nanus | Entire | 5 | Not Listed |
| Amphipod, Potomac groundwater | Stygobromus tenuis potomacus | Entire | 5 | Not Listed |
| Amphipod, redacted cave | Stygobromus redactus | Entire | 5 | Not Listed |
| Amphipod, Redell's cave | Stygobromus reddelli | Entire | 2 | Not Listed |
| Amphipod, Rubious Cave | Stygobromus lucifugus | Entire | 3 | Not Listed |
| Amphipod, Shenandoah Valley cave | Stygobromus gracilipes | Entire | 5 | Not Listed |
| Amphipod, Southwestern Virginia cave | Stygobromus mackini | Entire | 4 | Not Listed |
| Amphipod, Spring Cave | Stygobromus spinatus | Entire | 5 | Not Listed |
| Amphipod, Stellmack's cave | Stygobromus stellmacki | Entire | 5 | Not Listed |
| Amphipod, subtle cave | Stygobromus subtilis | Entire | 3 | Not Listed |
| Amphipod, tidewater | Stygobromus indentatus | Entire | 5 | Not Listed |
| Amphipod, tidewater interstitial | Stygobromus araeus | Entire | 5 | Not Listed |
| Amphipod, undescribed | Crangonyx sp | Entire | NA | Not Listed |
| Amphipod, [unnamed] | Stygobromus hoffmani | Entire | 5 | Not Listed |
| Amphipod, Wengerors' cave | Stygobromus wengerorum | Entire | 1 | UR |
| Amphipod, Wisconsin well | Stygobromus putealis | Entire | 3 | Not Listed |
| Amphiuma, One-toed | Amphiuma pholeter | Entire | 4 | Not Listed |
| `Anaunau | Lepidium arbuscula | 1 | E | |
| `Anaunau | Lepidium bidentatum o-waihiense | 1 | Not Listed | |
| `Anaunau | Lepidium serra | 1 | Not Listed | |
| `Anaunau, Remy's | Lepidium bidentatum remyi | 1 | Not Listed | |
| Ancylid, domed | Rhodacmea elatior | Entire | 4 | Not Listed |
| Ancylid, hood | Ferrissia mcneili | Entire | 4 | Not Listed |
| Ancylid, wicker | Rhodacmea filosa | Entire | 4 | Not Listed |
| Andrenid bee, Antioch | Perdita scitula antiochensis | Entire | 1 | Not Listed |
| Andrenid bee, yellow-banded | Perdita hirticeps luteocincta | Entire | 1 | Not Listed |
| Anemone, Edge Falls | Anemone edwardsiana petraea | 2 | Not Listed | |
| Anemone, [unnamed] | Anemone edwardsiana edwardsiana | 2 | Not Listed | |
| Anemone, [unnamed] | Anemone minima | 5 | Not Listed | |
| Anemone, [unnamed] | Anemone oregana felix | 1 | Not Listed | |
| Angelica, Call's | Angelica callii | 1 | Not Listed | |
| Anglepod, Falfurrias | Matelea radiata | 2 | Not Listed | |
| Anglepod, [unnamed] | Matelea alabamensis | 4 | Not Listed | |
| Anglepod, [unnamed] | Matelea baldwyniana | 4 | Not Listed | |
| Ani, smooth-billed | Crotophaga ani | Entire | 4 | Not Listed |
| Anoa, lowland | Bubalus depressicornis | Entire | Foreign | E |
| Anoa, mountain | Bubalus quarlesi | Entire | Foreign | E |
| Anobiid beetle, Piko | Holcobius pikoensis | Entire | 1 | Not Listed |
| Anole, Cook's | Anolis cooki | Entire | 4 | Not Listed |
| Anole, Culebra Island giant | Anolis roosevelti | Entire | 4 | E |
| Anole, Puerto Rican pygmy | Anolis occultus | Entire | 4 | Not Listed |
| Ant, ancient | Smithistruma reliquia | Entire | 1 | Not Listed |
| Ant, Charleston | Lasius nevadensis | Entire | 1 | Not Listed |
| Antelope, giant sable | Hippotragus niger variani | Entire | Foreign | E |
| antelope Tibetan | Pantholops hodgsonii | entire | Foreign | E |
| Anthicid, Antioch Dunes | Anthicus antiochensis | Entire | 1 | Not Listed |
| Anthicid, Sacramento | Anthicus sacramento | Entire | 1 | Not Listed |
| Antlion, Molokai | Distoleon perjerus | Entire | 1 | Not Listed |
| Antpitta, brown-banded | Grallaria milleri | Entire | 9 | PE |
| Ant, Valley oak | Proceratium californicum | Entire | 1 | UR |
| Ant, velvet | Dasymutilla imperialis | entire | 8 | Not Listed |
| Ant, velvet | Dasymutilla nocturna | entire | 8 | Not Listed |
| Antwren, black hooded (black-headed) | Formicivora erythronotos | Entire | 9 | E |
| `Anunu | Sicyos alba | 1 | E | |
| `Anunu | Sicyos cucumerinus | 1 | Not Listed | |
| `Anunu | Sicyos macrophyllus | 1 | C | |
| Apamea moth, Smyth's | Apamea smythi | Entire | 3 | Not Listed |
| Aphanisma | Aphanisma blitoides | 1 | Not Listed | |
| Apoda | Pelea parvifolia apoda | 1 | Not Listed | |
| Arc-mussel, Altamaha | Alasmidonta arcula | Entire | 4 | Not Listed |
| Arc-mussel, Florida | Alasmidonta wrightiana | Entire | 4 | Not Listed |
| Argali | Ovis ammon | Entire except Kyrgyzstan, Mongolia, and Tajikistan | Foreign | E |
| Argali | Ovis ammon | Kyrgyzstan, Mongolia, and Tajikistan | Foreign | T |
| Armadillo, giant | Priodontes maximus | Entire | Foreign | E |
| Armadillo, pink fairy | Chlamyphorus truncatus | Entire | Foreign | E |
| Arnica, Shasta | Arnica viscosa | 1 | Not Listed | |
| Arrow-grass, Gaspe Peninsula | Triglochin gaspense | 5 | Not Listed | |
| Arrowhead, bunched | Sagittaria fasciculata | 4 | E | |
| Arrowwood, [unnamed] | Viburnum bracteatum | 4 | Not Listed | |
| Artemisia, sp. nov. ined. | Artemisia sp. | 1 | Not Listed | |
| Ascyrum, Edison's | Hypericum edisonianum | 4 | Not Listed | |
| Ash, Goodding's | Fraxinus gooddingii | 2 | Not Listed | |
| Ash, large-petaled | Fraxinus cuspidata macropetala | 2 | Not Listed | |
| Ash, [unnamed] | Fraxinus anomala lowellii | 2 | Not Listed | |
| Asphodel, bog | Narthecium americanum | 5 | C | |
| Ass, African wild | Equus asinus | Entire | Foreign | E |
| Ass, Asian wild | Equus hemionus | Entire | Foreign | E |
| Aster, Borrego | Xylorhiza orcuttii | 1 | Not Listed | |
| aster, Bouquet | eurybia mirabilis | 4 | Not Listed | |
| Aster, brikellbush | Aster brickellioides | 1 | Not Listed | |
| Aster, Chapman's | Aster chapmani | 4 | Not Listed | |
| Aster, Columbian whitetop | Sericocarpus rigidus | 1 | Not Listed | |
| Aster, coyote-thistle | Aster eryngiifolius | 4 | Not Listed | |
| Aster, Cruise's golden | Chrysopsis gossypina cruiseana | 4 | Not Listed | |
| Aster, curtus | Aster curtus | 1 | Not Listed | |
| Aster, decurrent false | Boltonia decurrens | 3 | T | |
| Aster, Florida golden | Chrysopsis floridana | 4 | E | |
| Aster, Georgia | Symphyotrichum georgianum | 4 | C | |
| Aster, Godfrey's golden | Chrysopsis godfreyi | 4 | Not Listed | |
| Aster, Gorman | Aster gormanii | 1 | Not Listed | |
| Aster, Guadalupe smooth | Aster laevis guadalupensis | 2 | Not Listed | |
| Aster, Hawaiian | Aster sandwicensis | 1 | Not Listed | |
| Asteriid fly, Nihoa two-spotted | Bryania bipunctata | Entire | 1 | Not Listed |
| Aster, Jessica's | Aster jessicae | 1 | Not Listed | |
| Aster, Laguna Mountains | Machaeranthera asteroides lagunensis | 1 | Not Listed | |
| Aster, Mecca | Xylorhiza cognata | 1 | Not Listed | |
| Aster, Peirson's | Aster peirsonii | 1 | Not Listed | |
| aster, Red Rock Canyon | ionactis caelestis | 6 | Not Listed | |
| Aster, Rockcastle | Aster saxicastellii | 4 | Not Listed | |
| Aster, rough-stemmed | Aster puniceus scabricaulis | 2 | Not Listed | |
| Aster, Ruth's golden | Pityopsis ruthii | 4 | E | |
| Aster, serpentine | Aster depauperatus | 5 | Not Listed | |
| Aster, Suisun | Aster chilensis lentus | 1 | Not Listed | |
| Aster, [unnamed] | Aster brachypholis | 4 | Not Listed | |
| Aster, [unnamed] | Aster chasei | 3 | Not Listed | |
| Aster, [unnamed] | Aster furcatus | 3 | Not Listed | |
| Aster, [unnamed] | Aster glaucescens | 1 | Not Listed | |
| Aster, [unnamed] | Aster greatai | 1 | Not Listed | |
| Aster, [unnamed] | Aster hallii | 1 | Not Listed | |
| Aster, [unnamed] | Aster kingii kingii | 6 | Not Listed | |
| Aster, [unnamed] | Aster lemmonii | 2 | Not Listed | |
| Aster, [unnamed] | Aster mollis | 6 | Not Listed | |
| Aster, [unnamed] | Aster pinifolius | 4 | Not Listed | |
| Aster, [unnamed] | Aster plumosus | 4 | Not Listed | |
| Aster, [unnamed] | Aster schistosus | 5 | Not Listed | |
| Aster, [unnamed] | Aster spinulosus | 4 | Not Listed | |
| Aster, [unnamed] | Aster verutifolius | 4 | Not Listed | |
| Aster, wayside | Aster vialis | 1 | Not Listed | |
| Aster, western bog | Aster paludicola | 1 | Not Listed | |
| Aster, Yukon | Aster yukonensis | 7 | Not Listed | |
| Aster, Ziegler's | Machaeranthera canescens ziegleri | 1 | Not Listed | |
| Auklet, Cassin's | Ptychoramphus aleuticus | Entire | 1 | Not Listed |
| aumakua, Palapalai | Dryopteris crinalis var. podosorus | 1 | E | |
| Aupaka | Isodendrion hosakae | 1 | E | |
| Aupaka | Isodendrion laurifolium | 1 | E | |
| Aupaka | Isodendrion longifolium | 1 | T | |
| Avahi | Avahi laniger (entire genus) | Entire | Foreign | E |
| Avens, bent | Geum geniculatum | 4 | Not Listed | |
| Avens, mountain | Geum peckii | 5 | Not Listed | |
| Avens, spreading | Geum radiatum | 4 | E | |
| `Awikiwiki | Canavalia molokaiensis | 1 | E | |
| `Awikiwiki | Canavalia napaliensis | 1 | E | |
| `Awikiwiki | Canavalia pubescens | 1 | C | |
| Awiwi | Centaurium sebaeoides | 1 | E | |
| Awiwi | Hedyotis cookiana | 1 | E | |
| Aye-aye | Daubentonia madagascariensis | Entire | Foreign | E |
| Ayenia, Texas | Ayenia limitaris | 2 | E | |
| Ayumodoki (loach) | Hymenophysa curta | Entire | Foreign | E |
| Azalea, pink-shell | Rhododendron vaseyi | 4 | Not Listed | |
| Azalea, plumleaf | Rhododendron prunifolium | 4 | Not Listed | |
| Babirusa | Babyrousa babyrussa | Entire | Foreign | E |
| Baboon, gelada | Theropithecus gelada | Entire | Foreign | T |
| Baccharis, Encinitas | Baccharis vanessae | 8 | T | |
| Bacora, marron | Solanum conocarpum | 4 | C | |
| badger, American | taxidiinae taxus | Entire | 2 | Not Listed |
| Baeria, Salinas Valley | Lasthenia leptalea | 1 | Not Listed | |
| Ballmoss, Bailey's | Tillandsia baileyi | 2 | Not Listed | |
| balsamroot, Big scale | balsamorhiza macrolepis var. macrolepis | 6 | Not Listed | |
| Bandicoot, barred | Perameles bougainville | Entire | Foreign | E |
| Bandicoot, desert | Perameles eremiana | Entire | Foreign | E |
| Bandicoot, lesser rabbit | Macrotis leucura | Entire | Foreign | E |
| Bandicoot, pig-footed | Chaeropus ecaudatus | Entire | Foreign | E |
| Bandicoot, rabbit | Macrotis lagotis | Entire | Foreign | E |
| Bankclimber, purple (mussel) | Elliptoideus sloatianus | Entire | 4 | T |
| Banteng | Bos javanicus | Entire | Foreign | E |
| Barbara's buttons, large-flowered | Marshallia grandiflora | 5 | Not Listed | |
| Barberry, Hardy Creek | Berberis nervosa mendocinensis | 1 | Not Listed | |
| Barberry, Higgin's | Berberis higginsiae | 1 | Not Listed | |
| Barberry, island | Berberis pinnata ssp. insularis | 8 | E | |
| Barberry, Kofa | Berberis harrisoniana | 2 | Not Listed | |
| Barberry, Nevin's | Berberis nevinii | 8 | E | |
| Barberry, Truckee | Berberis (=Mahonia) sonnei | 8 | DO | |
| Barberry, [unnamed] | Berberis swaseyi | 2 | Not Listed | |
| Barbthroat, black | Threnetes grzimeki | Entire | Foreign | UR |
| Bariaco | Trichilia triacantha | 4 | E | |
| barley, Vernal | hordeum intercedens | 6 | Not Listed | |
| Barrel cactus, coast | Ferocactus viridescens | 1 | Not Listed | |
| barren strawberry, Piedmont | Waldsteinia lobata | 4 | Not Listed | |
| Bass, Guadalupe | Micropterus treculi | Entire | 2 | Not Listed |
| Bat, Allen's big-eared | Idionycteris phyllotis | Entire | 6 | Not Listed |
| bat, Big brown | eptesicus fuscus | Entire | 6 | Not Listed |
| Bat, big free-tailed | Nyctinomops macrotis | Entire | 2 | Not Listed |
| Bat, Bulmer's fruit (=flying fox) | Aproteles bulmerae | Entire | Foreign | E |
| Bat, bumblebee | Craseonycteris thonglongyai | Entire | Foreign | E |
| Bat, California leaf-nosed | Macrotus californicus | Entire | 2 | Not Listed |
| Bat, Desmarest's fig-eating | Stenoderma rufum | Entire | 4 | Not Listed |
| Bat, Eastern small-footed | Myotis leibii | Entire | 5 | UR |
| bat, Florida bonneted | Eumops floridanus | Entire | 4 | C |
| Bat, gray | Myotis grisescens | Entire | 3 | E |
| Bat, Hawaiian hoary | Lasiurus cinereus semotus | Entire | 1 | E |
| Bat, Indiana | Myotis sodalis | Entire | 3 | E |
| Bat, insular long-tongued | Monophylus plethodon frater | Entire | 4 | Not Listed |
| Bat, lesser long-nosed | Leptonycteris curasoae yerbabuenae | Entire | 2 | E |
| Bat, little Mariana fruit | Pteropus tokudae | Entire | 1 | E |
| Bat, Mariana fruit (=Mariana flying fox) | Pteropus mariannus mariannus | entire range | 1 | T |
| Bat, Mexican long-nosed | Leptonycteris nivalis | Entire | 2 | E |
| Bat, Mexican long-tongued | Choeronycteris mexicana | Entire | 2 | Not Listed |
| Bat, occult little brown | Myotis lucifugus occultus | Entire | 2 | Not Listed |
| Bat, Ozark big-eared | Corynorhinus (=Plecotus) townsendii ingens | Entire | 2 | E |
| Bat, Pacific sheath-tailed | Emballonura semicaudata rotensis | Entire | 1 | C |
| Bat, Pacific sheath-tailed | Emballonura semicaudata semicaudata | American Samoa | 1 | C |
| Bat, Pacific Townsend's big-eared | Plecotus townsendii townsendii | Entire | 1 | Not Listed |
| Bat, Pagan Mariana flying fox | Pteropus mariannus paganensis | Entire | 1 | Not Listed |
| Bat, pale Townsend's big-eared | Plecotus townsendii pallescens | Entire | 2 | Not Listed |
| bat, Pallid | antrozous pallidus | Entire | 2 | Not Listed |
| bat, Pocketed free-tailed | nyctinomops femorosaccus | Entire | 6 | Not Listed |
| Bat, Rafinesque's big-eared | Plecotus rafinesquii | Entire | 4 | Not Listed |
| Bat, Rodrigues fruit (=flying fox) | Pteropus rodricensis | Entire | Foreign | E |
| Bat, Samoan fruit | Pteropus samoensis samoensis | Entire | 1 | UR |
| Bat, sheath-tailed | Emballonura semicaudata sulcata | Entire | 1 | Not Listed |
| bat, Silver-haired | lasionycteris noctivagans | Entire | 7 | Not Listed |
| Bat, Singapore roundleaf horseshoe | Hipposideros ridleyi | Entire | Foreign | E |
| bat, Southern yellow | Lasiurus ega | Entire | 8 | Not Listed |
| Bat, spotted | Euderma maculatum | Entire | 2 | Not Listed |
| bat, Townsend's western big-eared | plecotus townsendii ssp. pallescens | Entire | 6 | Not Listed |
| bat, Townsend's western big-eared | plecotus townsendii ssp. townsendii | Entire | 6 | Not Listed |
| Bat, Virginia big-eared | Corynorhinus (=Plecotus) townsendii virginianus | Entire | 5 | E |
| bat, Western red | lasiurus blossevillii | Entire | 6 | Not Listed |
| Beaked-rush, California | Rhynchospora californica | 1 | Not Listed | |
| Beaked-rush, hairy-peduncled | Rhynchospora crinipes | 4 | Not Listed | |
| Beaked-rush, Knieskern's | Rhynchospora knieskernii | 5 | T | |
| Beaked-rush, Thorne's | Rhynchospora thornei | 4 | Not Listed | |
| Beaked-rush, [unnamed] | Rhynchospora culixa | 4 | Not Listed | |
| Beaked-rush, [unnamed] | Rhynchospora decurrens | 4 | Not Listed | |
| Beaked-rush, [unnamed] | Rhynchospora globularis saxicola | 4 | Not Listed | |
| Beaked-rush, [unnamed] | Rhynchospora punctata | 4 | Not Listed | |
| Bean, Choctaw | Villosa choctawensis | Entire | 4 | PE |
| Bean, Cumberland (pearlymussel) | Villosa trabalis | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Bean, Cumberland (pearlymussel) | Villosa trabalis | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Bean, Cumberland (pearlymussel) | Villosa trabalis | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Bean, purple | Villosa perpurpurea | Entire | 5 | E |
| Bean, rayed | Villosa fabalis | Entire | 3 | E |
| Bean, supine | Phaseolus supinus | 2 | Not Listed | |
| Bear, American black | Ursus americanus | U.S.A. (LA, all counties; MS, TX, only within the historic county range of the Louisiana black bear) | 4 | SAT |
| Bear, Baluchistan | Ursus thibetanus gedrosianus | Entire | Foreign | E |
| Bear, brown | Ursus arctos arctos | Italy | Foreign | E |
| Bear, brown | Ursus arctos arctos | Kenai Peninsula Population | 7 | Not Listed |
| Bear, brown | Ursus arctos horribilis | Alaska | NA | Not Listed |
| Bear, brown | Ursus arctos pruinosus | Entire | Foreign | E |
| Beard grass, [unnamed] | Andropogon arctatus | 4 | Not Listed | |
| Beardtongue, Absaroka | Penstemon absarokensis | 6 | Not Listed | |
| Beardtongue, Alamo | Penstemon alamosensis | 2 | Not Listed | |
| Beardtongue Ben Franklin's | Penstemon franklinii | 6 | Not Listed | |
| Beardtongue, cache | Penstemon compactus | 6 | Not Listed | |
| Beardtongue, Cary | Penstemon caryi | 6 | Not Listed | |
| Beardtongue, Cataiina | Penstemon discolor | 2 | Not Listed | |
| beardtongue, Charleston | penstemon leiophyllus var. keckii | 6 | Not Listed | |
| Beardtongue, closed-lip | Penstemon personatus | 1 | Not Listed | |
| Beardtongue, Degener | Penstemon degeneri | 6 | Not Listed | |
| Beardtongue, Garrett's | Penstemon scariosus garrettii | 6 | Not Listed | |
| Beardtongue, Gibbens | Penstemon gibbensii | 6 | Not Listed | |
| Beardtongue, Graham | Penstemon grahamii | 6 | PT | |
| Beardtongue, Harrington | Penstemon harringtonii | 6 | Not Listed | |
| Beardtongue, Lemhi | Penstemon lemhiensis | 1 | Not Listed | |
| Beardtongue, low | Penstemon nanus | 6 | Not Listed | |
| Beardtongue, Mt. Trumbull | Penstemon distans | 2 | Not Listed | |
| Beardtongue, Parachute | Penstemon debilis | 6 | T | |
| Beardtongue, Payson | Penstemon paysoniorum | 6 | Not Listed | |
| Beardtongue, Penland | Penstemon penlandii | 6 | E | |
| Beardtongue, Red Canyon | Penstemon bracteatus | 6 | Not Listed | |
| Beardtongue, small | Penstemon parvus | 6 | Not Listed | |
| Beardtongue, stemless | Penstemon acaulis | 6 | Not Listed | |
| Beardtongue, Stephens' | Penstemon stephensii | 1 | Not Listed | |
| Beardtongue, Tidestrom | Penstemon tidestromii | 6 | Not Listed | |
| Beardtongue, tiger | Penstemon mensarum | 6 | Not Listed | |
| Beardtongue, Tracy | Penstemon tracyi | 1 | Not Listed | |
| Beardtongue, Tunnel Springs | Penstemon concinnus | 6 | Not Listed | |
| Beardtongue, Uintah | Penstemon uintahensis | 6 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon abietinus | 6 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon angustifolius dulcis | 6 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon caespitosus suffruticosus | 6 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon clutei | 2 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon deamii | 3 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon decurvus | 1 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon glaucinus | 1 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon keckii | 1 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon leiophyllus | 6 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon nyeensis | 1 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon pahutensis | 1 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon pinorum | 6 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon retrorsus | 6 | Not Listed | |
| Beardtongue, [unnamed] | Penstemon rubicundus | 1 | Not Listed | |
| Beardtongue, Wallowa | Penstemon spatulatus | 1 | Not Listed | |
| Beardtongue, Ward | Penstemon wardii | 6 | Not Listed | |
| Beardtongue, White River | Penstemon scariosus albifluvis | 6 | C | |
| Bear, Florida black | Ursus americanus floridanus | Entire | 4 | Not Listed |
| Bear, Glacier | Ursus americanus emmonsii | Entire | 7 | Not Listed |
| Beargrass, Britton's | Nolina brittoniana | 4 | E | |
| Beargrass, Dehesa | Nolina interrata | 1 | Not Listed | |
| beargrass, Peninsular | Nolina cismontana | 1 | Not Listed | |
| Beargrass, sp. nov. ined. (chaparral) | Nolina sp. | 1 | Not Listed | |
| Beargrass, [unnamed] | Nolina atopocarpa | 4 | Not Listed | |
| Bear, grizzly | Ursus arctos horribilis | Cabinet-Yaak Recovery Zone Population | 6 | UR |
| Bear, grizzly | Ursus arctos horribilis | North Cascades Ecosystem Recovery Zone Population | 6 | UR |
| Bear, grizzly | Ursus arctos horribilis | Selkirk Recovery Zone Population | 6 | UR |
| Bear, grizzly | Ursus arctos horribilis | U.S.A., conterminous (lower 48) States, except where listed as an experimental population or delisted | 6 | T |
| Bear, grizzly | Ursus arctos horribilis | U.S.A. experimental non-essential (portions of ID and MT, see 17.84(l)) | 6 | EXPN |
| Bear, Louisiana black | Ursus americanus luteolus | Entire | 4 | T |
| Bear, Mexican grizzly | Ursus arctos | Mexico | Foreign | E |
| Bear, polar | Ursus maritimus | Entire | 7 | T |
| Bear-poppy, Dwarf | Arctomecon humilis | 6 | E | |
| Beauty, Harper's | Harperocallis flava | 4 | E | |
| Beaver (Mongolian) | Castor fiber birulai | Entire | Foreign | E |
| Beavertail cactus, short-jointed | Opuntia basilaris brachyclada | 1 | Not Listed | |
| Bedstraw, Borrego | Galium angustifolium borregoense | 1 | Not Listed | |
| Bedstraw, cliff | Galium correllii | 2 | Not Listed | |
| Bedstraw, Cone Peak | Galium californicum luciense | 1 | Not Listed | |
| Bedstraw, El Dorado | Galium californicum ssp. sierrae | 8 | E | |
| Bedstraw, Hardham's | Galium hardhamiae | 1 | Not Listed | |
| Bedstraw, island | Galium buxifolium | 8 | E | |
| Bedstraw, Kingston | Galium hilendiae kingstonense | 1 | Not Listed | |
| Bedstraw, Modoc | Galium glabrescens modocense | 1 | Not Listed | |
| Bedstraw, San Clemente island | Galium catalinense acrispum | 1 | Not Listed | |
| Bedstraw, San Gabriel | Galium grande | 1 | Not Listed | |
| Bedstraw, San Jacinto | Galium californicum primum | 1 | Not Listed | |
| bedstraw, San Jacinto Mountains | galium angustifolium ssp. jacinticum | 6 | Not Listed | |
| Bedstraw, San Miguel Island | Galium californicum miguelense | 1 | Not Listed | |
| Bedstraw, Santa Lucia | Galium clementis | 1 | Not Listed | |
| Bedstraw, Scott Mountains | Galium serpenticum scotticum | 1 | Not Listed | |
| Bedstraw, Telescope Peak | Galium hypotrichium tomentellum | 1 | Not Listed | |
| Bedstraw, [unnamed] | Galium andrewsii gatense | 1 | Not Listed | |
| Bedstraw, [unnamed] | Galium collomae | 2 | Not Listed | |
| Bedstraw, Warner Mountains | Galium serpenticum warnerense | 1 | Not Listed | |
| Bee, Andrenid | Perdita algondones | Entire | 1 | Not Listed |
| Bee, Andrenid | Perdita glamis | entire | 8 | Not Listed |
| Bee, Riverside cuckoo | Holcopasites ruthae | Entire | NA | Not Listed |
| Beetle | Amblyderus werneri | Entire | 6 | Not Listed |
| Beetle | Cyclocephala wandae | entire | 8 | Not Listed |
| Beetle, American burying | Nicrophorus americanus | Entire | 2 | E |
| Beetle, American burying | Nicrophorus americanus | Experimental Population in Wah'Kon-tah Prairie in southwest Missouri. | 3 | EXPN |
| Beetle, bog idol leaf | Donacia idola | Entire | 1 | Not Listed |
| Beetle, Channel Islands dune | Coelus pacificus | Entire | 1 | Not Listed |
| Beetle, Coffin Cave mold | Batrisodes texanus | Entire | 2 | E |
| Beetle, Comal Springs dryopid | Stygoparnus comalensis | Entire | 2 | E |
| Beetle, Comal Springs riffle | Heterelmis comalensis | Entire | 2 | E |
| Beetle, Death Valley agabus diving | Agabus rumppi | Entire | 1 | UR |
| Beetle, delta green ground | Elaphrus viridis | Entire | 8 | T |
| Beetle, Duck River cave | Pseudanophthalmus tullahoma | Entire | 4 | Not Listed |
| Beetle, globose dune | Coelus globosus | Entire | 1 | Not Listed |
| Beetle, Hardy's dune | Anomala hardyorum | entire | 8 | Not Listed |
| Beetle, Helotes mold | Batrisodes venyivi | Entire | 2 | E |
| Beetle, Hungerford's crawling water | Brychius hungerfordi | Entire | 3 | E |
| Beetle, Kretschmarr Cave mold | Texamaurops reddelli | Entire | 2 | E |
| Beetle, Mojave rabbitbrush longhorn | Crossidius mojavensis mojavensis | Entire | 1 | Not Listed |
| Beetle, Mount Hermon June | Polyphylla barbata | Entire | 8 | E |
| Beetle, Nickajack Cave | Pseudanophthalmus nickajackensis | Entire | 4 | Not Listed |
| Beetle, riffle | Microcylloepus sp | Entire | NA | Not Listed |
| Beetle, Robinson's rain scarab | Phoebetus robinsoni | Entire | 1 | Not Listed |
| Beetle, San Joaquin dune | Coelus gracilis | Entire | 1 | Not Listed |
| Beetle, Santa Cruz rain | Pleocoma conjugens conjugens | Entire | 1 | Not Listed |
| Beetle, seclusive water scavenger | Paracymus seclusus | Entire | 4 | Not Listed |
| Beetle, Snail shell cave | Pseudanophthalmus acherontis | Entire | 4 | Not Listed |
| Beetle, Tooth Cave blind rove | Cylindropsis sp. | Entire | 2 | Not Listed |
| Beetle, Tooth Cave ground | Rhadine persephone | Entire | 2 | E |
| Beetle, valley elderberry longhorn | Desmocerus californicus dimorphus | Entire | 8 | T |
| Beetle, Warm Springs Zaitzevian riffle | Zaitzevia thermae | Entire | 6 | Not Listed |
| Beetle, West Wills Valley cave | Pseudanophthalmus assimilis | Entire | 4 | Not Listed |
| Bellflower, Basin | Campanula reverchonii | 2 | Not Listed | |
| Bellflower, Brooksville | Campanula robinsiae | 4 | E | |
| Benitoa, western | Benitoa occidentalis | 1 | Not Listed | |
| Bensoniella | Bensoniella oregona | 1 | Not Listed | |
| Bentgrass, awned | Agrostis aristiglumis | 1 | Not Listed | |
| Bentgrass, Blasdale's | Agrostis blasdalei blasdalei | 1 | Not Listed | |
| Bentgrass, coastal bluff | Agrostis clivicola clivicola | 1 | Not Listed | |
| Bentgrass, Henderson's | Agrostis microphylla hendersonii | 1 | Not Listed | |
| Bentgrass, Howell's | Agrostis howellii | 1 | Not Listed | |
| Bentgrass, Marin | Agrostis blasdalei marinensis | 1 | Not Listed | |
| Bentgrass, Point Reyes | Agrostis clivicola punta-reyesensis | 1 | Not Listed | |
| Bentgrass, Ross | Agrostis rossiae | 6 | Not Listed | |
| Berry, wooly | Vaccinium hirsutum | 4 | Not Listed | |
| Bidens, campylotheca | Bidens campylotheca campylotheca | 1 | Not Listed | |
| Bidens, cuneate | Bidens cuneata | 1 | DR | |
| Bidens, Forbes | Bidens forbesii | 1 | Not Listed | |
| Bidens, Manoa | Bidens coarctata | 1 | Not Listed | |
| Bidens, Maunalua | Bidens graciloides | 1 | Not Listed | |
| Bidens, poplar-leaved | Bidens populifolia | 1 | Not Listed | |
| Bidens, robust | Bidens valida | 1 | Not Listed | |
| Bidens, willow-leaved | Bidens salicoides | 1 | Not Listed | |
| Bilberry, Siskiyou Mountains | Vaccinium coccineum | 1 | Not Listed | |
| bindweed, Clay | convolvulus equitans | 6 | Not Listed | |
| Birch, [unnamed] | Betula murrayana | 3 | Not Listed | |
| Birch, Virginia round-leaf | Betula uber | 5 | T | |
| Birds-beak, desert | Cordylanthus eremicus eremicus | 1 | Not Listed | |
| Bird's-beak, Fresno County | Cordylanthus tenuis barbatus | 1 | Not Listed | |
| Birds-beak, hispid | Cordylanthus mollis hispidus | 1 | Not Listed | |
| Bird's-beak, Mt. Diablo | Cordylanthus nidularius | 8 | Not Listed | |
| Birds-beak, northcoast | Cordylanthus maritimus palustris | 1 | Not Listed | |
| Bird's-beak, Orcutt's | Cordylanthus orcuttianus | 1 | Not Listed | |
| Birds-beak, pallid | Cordylanthus tenuis pallescens | 1 | Not Listed | |
| Bird's beak, palmate-bracted | Cordylanthus palmatus | 8 | E | |
| Bird's-beak, Pennell's | Cordylanthus tenuis ssp. capillaris | 8 | E | |
| Bird's-beak, salt marsh | Cordylanthus maritimus ssp. maritimus | 8 | E | |
| Birds-beak, San Bernardino | Cordylanthus eremicus bernardinus | 1 | Not Listed | |
| Birds-beak, seaside | Cordylanthus rigidus littoralis | 1 | Not Listed | |
| Bird's-beak, soft | Cordylanthus mollis ssp. mollis | 8 | E | |
| Bird's-beak, Tecopa | Cordylanthus tecopensis | 1 | Not Listed | |
| Birds-in-a-nest, Carolina | Macbridea caroliniana | 4 | Not Listed | |
| Birds-in-a-nest, white | Macbridea alba | 4 | T | |
| Biscuitroot, Cedar Breaks | Cymopterus minimus | 6 | Not Listed | |
| Biscuitroot, Coulter | Cymopterus coulteri | 6 | Not Listed | |
| Biscuitroot, Duchesne | Cymopterus duchesnensis | 6 | Not Listed | |
| Biscuitroot, Higgins | Cymopterus acaulis higginsii | 6 | Not Listed | |
| Bison, plains | Bison bison bison | Entire | 6 | Not Listed |
| Bison, wood | Bison bison athabascae | Canada | 7 | E |
| Bittercress, Constance's | Cardamine constancei | 1 | Not Listed | |
| Bittercress, Kona | Cardamine konaensis | 1 | Not Listed | |
| Bittercress, Long's | Cardamine longii | 5 | Not Listed | |
| Bittercress, mountain | Cardamine clematitis | 4 | Not Listed | |
| Bittercress, Saddle Mountain | Cardamine pattersonii | 1 | Not Listed | |
| Bittercress, small-anthered | Cardamine micranthera | 4 | E | |
| Bittercress, [unnamed] | Cardamine rupicola | 6 | Not Listed | |
| bittern, American | botaurus lentiginosus | Entire | 7 | Not Listed |
| Bittern, least | Ixobrychus exilis hesperis | Entire | 1 | Not Listed |
| Bitterroot, Yosemite | Lewisia disepala | 1 | Not Listed | |
| Blackbird, grey-headed | Turdus poliocephalus poliocephalus | Entire | Foreign | UR |
| Blackbird, tricolored | Agelaius tricolor | Entire | 1 | Not Listed |
| Blackbird, yellow-shouldered | Agelaius xanthomus | Entire | 4 | E |
| Bladder-pod, Bryce | Lesquerella rubicundula | 6 | Not Listed | |
| Bladder-pod, Duck River | Lesquerella densipila | 4 | Not Listed | |
| Bladderpod, Dudley Bluffs | Lesquerella congesta | 6 | T | |
| Bladder-pod, Fremont's | Lesquerella fremontii | 6 | Not Listed | |
| Bladder-pod, Garrett | Lesquerella garrettii | 6 | Not Listed | |
| Bladder-pod, golden | Lesquerella aurea | 2 | Not Listed | |
| Bladder-pod, Gooddings | Lesquerella gooddingii | 2 | Not Listed | |
| Bladderpod, Kaibab | Lesquerella kaibabensis | 2 | Not Listed | |
| Bladderpod, keeled | Lesquerella carinata | 6 | Not Listed | |
| Bladderpod, kodachrome | Lesquerella tumulosa | 6 | E | |
| Bladder-pod, large-fruited | Lesquerella macrocarpa | 6 | Not Listed | |
| Bladderpod, lyrate | Lesquerella lyrata | 4 | T | |
| bladderpod, Missouri | Physaria filiformis | 3 | T | |
| Bladderpod Pryor Mountains | Lesquerella lesicii | 6 | Not Listed | |
| Bladderpod, San Bernardino Mountains | Lesquerella kingii ssp. bernardina | 8 | E | |
| Bladderpod, Short's | Physaria globosa | 4 | C | |
| Bladderpod, Spring Creek | Lesquerella perforata | 4 | E | |
| Bladderpod, Stones River | Lesquerella stonensis | 4 | Not Listed | |
| Bladder-pod, strong | Lesquerella valida | 2 | Not Listed | |
| Bladder-pod, thread-leaved | Lesquerella angustifolia | 2 | Not Listed | |
| Bladder-pod, [unnamed] | Lesquerella hitchcockii | 1 | Not Listed | |
| Bladder-pod, [unnamed] | Lesquerella kingii diversifolia | 1 | Not Listed | |
| Bladder-pod, [unnamed] | Lesquerella lata | 2 | Not Listed | |
| Bladder-pod, [unnamed] | Lesquerella lescurii | 4 | Not Listed | |
| Bladder-pod, [unnamed] | Lesquerella mcvaughiana | 2 | Not Listed | |
| Bladder-pod, [unnamed] | Lesquerella parviflora | 6 | Not Listed | |
| Bladder-pod, [unnamed] | Lesquerella pruinosa | 6 | Not Listed | |
| Bladderpod, [unnamed] | Lesquerella humilis | 6 | Not Listed | |
| Bladderpod, [unnamed] | Lesquerella paysonii | 6 | Not Listed | |
| Bladderpod, white | Lesquerella pallida | 2 | E | |
| Bladderpod, White Bluffs | Physaria douglasii tuplashensis | 1 | PT | |
| Bladderpod, Zapata | Lesquerella thamnophila | 2 | E | |
| Blanketflower, white | Gaillardia aestivalis winkleri | 2 | Not Listed | |
| Blanketflower, yellow | Gaillardia flava | 6 | Not Listed | |
| Blazingstar, Ash Meadows | Mentzelia leucophylla | 8 | T | |
| Blazing-star, clay | Mentzelia argillosa | 6 | Not Listed | |
| Blazingstar, Godfrey's | Liatris provincialis | 4 | Not Listed | |
| Blazingstar Goodrich's | Mentzelia goodrichii | 6 | Not Listed | |
| Blazingstar, Heller's | Liatris helleri | 4 | T | |
| Blazingstar, scrub | Liatris ohlingerae | 4 | E | |
| Blazingstar, [unnamed] | Liatris borealis | 5 | Not Listed | |
| Bleeding-heart, Pacific | Dicentra formosa oregana | 1 | Not Listed | |
| Bleeding-heart, Sierra Nevada | Dicentra nevadensis | 1 | Not Listed | |
| Bleedingheart, yellow | Dicentra ochroleuca | 1 | Not Listed | |
| Blindcat, Mexican (catfish) | Prietella phreatophila | Entire | Foreign | E |
| Blindcat, toothless | Trogloglanis pattersoni | Entire | 2 | Not Listed |
| Blindcat, widemouth | Satan eurystomus | Entire | 2 | Not Listed |
| Blister beetle, Anthony | Lytta mirifica | Entire | 2 | Not Listed |
| Blister beetle, Hopping's | Lytta hoppingi | Entire | 1 | Not Listed |
| Blister beetle, moestan | Lytta moesta | Entire | 1 | Not Listed |
| Blister beetle, Mojave Desert | Lytta inseparata | Entire | 1 | Not Listed |
| Blister beetle, molestan | Lytta molesta | Entire | 1 | Not Listed |
| Blister beetle, Morrison's | Lytta morrisoni | Entire | 1 | Not Listed |
| Blossom, green (pearlymussel) | Epioblasma torulosa gubernaculum | Entire | 4 | E |
| Blossom, tubercled (pearlymussel) | Epioblasma torulosa torulosa | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Blossom, tubercled (pearlymussel) | Epioblasma torulosa torulosa | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Blossom, turgid (pearlymussel) | Epioblasma turgidula | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Blossom, turgid (pearlymussel) | Epioblasma turgidula | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Blossom, yellow (pearlymussel) | Epioblasma florentina florentina | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Blossom, yellow (pearlymussel) | Epioblasma florentina florentina | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Blue, Baking Powder Flat | Euphilotes bernardino minuta | Entire | 8 | UR |
| Bluebell, Drummond | Mertensia drummondii | 7 | Not Listed | |
| Bluebells, canescent | Mertensia viridis cana | 6 | Not Listed | |
| Bluebells, smooth-leaf | Mertensia viridis dilatata | 6 | Not Listed | |
| Bluebells, [unnamed] | Mertensia toyabensis | 1 | Not Listed | |
| bluebird, Western | sialia mexicana | Entire | 2 | Not Listed |
| Blue, Boharts' | Philotiella speciosa bohartorum | Entire | 1 | Not Listed |
| Bluecup, Lake Alamanor | Githopsis latifolia | 1 | Not Listed | |
| Bluecup, Mission Canyon | Githopsis diffusa filicaulis | 1 | Not Listed | |
| Bluecurls, Hidden Lake | Trichostema austromontanum ssp. compactum | 8 | T | |
| Blue curls, sp. nov. ined. | Trichostema sp. | 4 | Not Listed | |
| Blue, dark | Euphilotes enoptes ssp. | Entire | 1 | Not Listed |
| Blue-eyed grass, Mountain | Sisyrinchium sarmentosum | 1 | UR | |
| Bluegrass, Big Bend | Poa involuta | 2 | Not Listed | |
| Bluegrass, bog | Poa paludigena | 3 | Not Listed | |
| Bluegrass, Hawaiian | Poa sandvicensis | 1 | E | |
| Bluegrass, Lassen County | Poa fibrata | 1 | Not Listed | |
| Bluegrass, Mann's | Poa mannii | 1 | E | |
| Bluegrass, Napa | Poa napensis | 8 | E | |
| Bluegrass, Piper's | Poa piperi | 1 | Not Listed | |
| Bluegrass, San Bernardino | Poa atropurpurea | 8 | E | |
| Bluegrass, sea cliff | Poa unilateralis | 1 | Not Listed | |
| Bluegrass, timber | Poa rhizomata | 1 | Not Listed | |
| Bluegrass, [unnamed] | Poa strictiramea | 2 | Not Listed | |
| Blue, Mattoni's | Euphilotes rita mattoni | Entire | 1 | Not Listed |
| Blue, Pheres | Icaricia icarioides pheres | Entire | 1 | Not Listed |
| Blue, Point Reyes | Icaricia icariodes ssp. | Entire | 1 | Not Listed |
| Blue, Sand Mountain | Euphilotes rita ssp. | Entire | 1 | Not Listed |
| Blue, San Emigdio | Plebulina emigdionis | Entire | 1 | Not Listed |
| Blue, San Gabriel Mountains | Plejebus saepiolus ssp. | San Gabriel Mts | 1 | Not Listed |
| Blue, Spring Mountains | Plejebus shasta charlestonensis | Entire | 1 | Not Listed |
| Blue, Spring Mountains icarioides | Plejebus icarioides ssp. | Spring Mts | 1 | Not Listed |
| Blue-star, Kearney's | Amsonia kearneyana | 2 | E | |
| Blue-star, Louisiana | Amsonia ludoviciana | 4 | Not Listed | |
| Blue-star, smooth | Amsonia glaberrima | 2 | Not Listed | |
| Blue-star, Tharp | Amsonia tharpii | 2 | Not Listed | |
| Blue-star, [unnamed] | Amsonia grandiflora | 2 | Not Listed | |
| Blue-star, [unnamed] | Amsonia palmeri | 2 | Not Listed | |
| Blue-star, [unnamed] | Amsonia peeblesii | 2 | Not Listed | |
| Blue-star, [unnamed] | Amsonia repens | 2 | Not Listed | |
| Bluet, Alpine | Houstonia caerulea faxonorum | 5 | Not Listed | |
| Bluet, lateral | Enallagma laterale | Entire | 5 | Not Listed |
| Bluet, Roan Mountain | Hedyotis purpurea var. montana | 4 | E | |
| Bluet, [unnamed] | Hedyotis butterwickiae | 2 | Not Listed | |
| Blue, White Mountains icarioides | Plejebus icarioides ssp. | White Mts | 1 | Not Listed |
| Blue, White Mountains saepiolus | Plejebus saepiolus ssp. | White Mts | 1 | Not Listed |
| Blue, Xerces | Glaucopsyche xerces | Entire | 1 | Not Listed |
| Boa, coastal rosy | Lichanura trivirgata roseofusca | Entire | 1 | Not Listed |
| Boa, Jamaican | Epicrates subflavus | Entire | Foreign | E |
| Boa, Mona | Epicrates monensis monensis | Entire | 4 | T |
| Boa, Navassa dusky dwarf | Tropidophis melanurus bucculentus | Entire | 4 | Not Listed |
| Boa, Puerto Rican | Epicrates inornatus | Entire | 4 | E |
| Boa, rosy | Lichanura trivirgata | Entire | 2 | Not Listed |
| Boa, Round Island bolyeria | Bolyeria multocarinata | Entire | Foreign | E |
| Boa, Round Island casarea | Casarea dussumieri | Entire | Foreign | E |
| Boa, southern rubber | Charina bottae umbratica | Entire | 1 | Not Listed |
| Boa, Virgin Islands tree | Epicrates monensis granti | Entire | 4 | E |
| Bobcat | Lynx rufus | Entire | NA | Not Listed |
| Bobcat, Mexican | Lynx (=Felis) rufus escuinapae | Entire | Foreign | E |
| Bobwhite, masked (quail) | Colinus virginianus ridgwayi | Entire | 2 | E |
| Bocaccio | Sebastes paucispinis | Puget Sound–Georgia Basin DPS—U.S.A.(WA) and British Columbia, including Puget Sound and Georgia Basin | NMFS | E |
| Bog-asphodel, smooth | Tofieldia glabra | 4 | Not Listed | |
| Bonamia, bigpod | Bonamia ovalifolia | 2 | Not Listed | |
| Bonamia, Florida | Bonamia grandiflora | 4 | T | |
| Boneset, pine barrens | Eupatorium resinosum | 5 | Not Listed | |
| Bontebok | Damaliscus pygarus (=dorcas) dorcas | Entire | Foreign | E |
| Bonytongue, Asian | Scleropages formosus | Entire | Foreign | E |
| Booby, Abbott's | Papasula (=Sula) abbotti | Entire | Foreign | E |
| Bottlebrush grass, California | Elymus californicus | 1 | Not Listed | |
| Boxwood, Vahl's | Buxus vahlii | 4 | E | |
| Brachymenium, Anderson's | Brachymenium andersonii | 4 | Not Listed | |
| Brasil, Edwards' | Condalia hookeri edwardsiana | 2 | Not Listed | |
| Braya, alpine | Braya humilis ventosa | 6 | Not Listed | |
| Brazos-mint, Centerville | Brazoria pulcherrima | 2 | Not Listed | |
| Brickell-bush, Florida | Brickellia mosieri | 4 | C | |
| Brickell-bush, Flyr's | Brickellia cordifolia | 4 | Not Listed | |
| Brickellia, Knapp's | Brickellia knappiana | 1 | Not Listed | |
| Brickellia, Sierra Vieja | Brickellia viejensis | 2 | Not Listed | |
| Bricklebush, Hinckley's | Brickellia brachyphylla montanus | 1 | Not Listed | |
| Bricklebush, Terlingua | Brickellia brachyphylla terlinguensis | 2 | Not Listed | |
| Brine shrimp, Mono Lake | Artemia monica | Entire | 1 | Not Listed |
| Bristlebird, western | Dasyornis longirostris (=brachypterus I.) | Entire | Foreign | E |
| Bristlebird, western rufous | Dasyornis broadbenti littoralis | Entire | Foreign | E |
| Bristlefront, Stresemann's | Merulaxis stresemanni | Entire | NA | Not Listed |
| Bristle-moss, Keever's | Orthotrichum keeverae | 4 | Not Listed | |
| Bristlesnail, Trinity | Monadenia setosa | Entire | 1 | Not Listed |
| Bristletail, Hawaiian long-palp | Neomachiloides heteropus | Entire | 1 | Not Listed |
| Bristletail, Perkin's club-palp | Machiloides perkinsi | Entire | 1 | Not Listed |
| Brittlescale | Atriplex depressa | 1 | Not Listed | |
| Brittlescale, Parrish's | Atriplex parishii | 1 | Not Listed | |
| Broadbill, Guam | Myiagra freycineti | Entire | 1 | D3A |
| Brodiaea, Chinese Camp | Brodiaea pallida | 8 | T | |
| Brodiaea, Dudley's | Triteleia dudleyi | 1 | Not Listed | |
| Brodiaea, Indian Valley | Brodiaea coronaria rosea | 1 | Not Listed | |
| Brodiaea, Kaweah | Brodiaea insignis | 1 | Not Listed | |
| Brodiaea, Orcutt's | Brodiaea orcuttii | 1 | Not Listed | |
| Brodiaea, San Clemente Island | Brodiaea kinkiensis | 1 | Not Listed | |
| Brodiaea, San Clemente Island | Triteleia clementina | 1 | Not Listed | |
| Brodiaea, thread-leaved | Brodiaea filifolia | 8 | T | |
| Brodiaea, vernal pool | Dichelostemma lacuna-vernalis | 1 | Not Listed | |
| Brome, Arizona | Bromus arizonicus | 1 | UR | |
| Brongniartia, little-leaf | Brongniartia minutifolia | 2 | Not Listed | |
| Broomrape, Rock Creek | Orobanche valida valida | 1 | Not Listed | |
| Broomrape, short-lobed | Orobanche parishii brachyloba | 1 | Not Listed | |
| Broom, San Clemente Island | Lotus dendroideus ssp. traskiae | 8 | E | |
| Browallia, sp. nov. ined. | Browallia sp. | 2 | Not Listed | |
| Buckmoth, [unnamed] | Hemileuca sp. | Entire | 5 | Not Listed |
| Buckthorn, [unnamed] | Bumelia thornei | 4 | Not Listed | |
| Buckwheat, Beatley | Eriogonum beatleyae | 1 | Not Listed | |
| Buckwheat Brandegee's Wild | Eriogonum brandegeei | 6 | UR | |
| Buckwheat, Butterworth's | Eriogonum butterworthianum | 1 | Not Listed | |
| Buckwheat, Cache Peak | Eriogonum kennedyi pinicola | 1 | Not Listed | |
| Buckwheat, Churchill Narrows | Eriogonum diatomaceum | 8 | C | |
| Buckwheat, Clark Mountain | Eriogonum heermannii floccosum | 1 | Not Listed | |
| Buckwheat, Conejo | Eriogonum crocatum | 1 | Not Listed | |
| Buckwheat, Congdon's | Eriogonum congdonii | 1 | Not Listed | |
| Buckwheat, Contra Costa | Eriogonum truncatum | 8 | Not Listed | |
| Buckwheat, cottony | Eriogonum gossypinum | 1 | Not Listed | |
| Buckwheat, Crosby's | Eriogonum crosbyae | 1 | Not Listed | |
| Buckwheat, cushenbury | Eriogonum ovalifolium var. vineum | 8 | E | |
| Buckwheat, Cusick's | Eriogonum cusickii | 1 | Not Listed | |
| Buckwheat, Donner Pass | Eriogonum umbellatum torreyanum | 1 | Not Listed | |
| Buckwheat, Dubakella Mountain | Eriogonum libertini | 1 | Not Listed | |
| Buckwheat, Eastwood's | Eriogonum eastwoodianum | 1 | Not Listed | |
| Buckwheat, forked | Eriogonum bifurcatum | 8 | Not Listed | |
| Buckwheat, Frisco | Eriogonum soredium | 6 | C | |
| Buckwheat, Gilman's | Eriogonum gilmanii | 1 | Not Listed | |
| Buckwheat, golden | Eriogonum chrysops | 1 | Not Listed | |
| Buckwheat, Hoffmann's | Eriogonum hoffmannii hoffmannii | 1 | Not Listed | |
| Buckwheat, Holmgren's | Eriogonum holmgrenii | 1 | Not Listed | |
| Buckwheat, Idria | Eriogonum vestitum | 1 | Not Listed | |
| Buckwheat, Ione (incl. Irish Hill) | Eriogonum apricum (incl. var. prostratum) | 8 | E | |
| Buckwheat, Jaynes Canyon | Eriogonum diclinum | 1 | Not Listed | |
| Buckwheat, Johnston's | Eriogonum microthecum johnstonii | 1 | Not Listed | |
| Buckwheat, jointed | Eriogonum intrafractum | 1 | Not Listed | |
| Buckwheat, Klamath Mountain | Eriogonum hirtellum | 1 | Not Listed | |
| Buckwheat, large red | Eriogonum grande rubescens | 1 | Not Listed | |
| buckwheat, Las Vegas | Eriogonum corymbosum var. nilesii | 8 | C | |
| Buckwheat, Mono | Eriogonum ampullaceum | 1 | Not Listed | |
| Buckwheat, mouse | Eriogonum nudum murinum | 1 | Not Listed | |
| Buckwheat, Mt. Eddy | Eriogonum umbellatum humistratum | 1 | Not Listed | |
| Buckwheat, Olanche Peak | Eriogonum wrightii olanchense | 1 | Not Listed | |
| Buckwheat, Panamint Mountains | Eriogonum microthecum panamintense | 1 | Not Listed | |
| Buckwheat, Pinnacles | Eriogonum nortonii | 1 | Not Listed | |
| Buckwheat, Piute | Eriogonum breedlovei breedlovei | 1 | Not Listed | |
| Buckwheat, Point Lobos | Eriogonum parvifolium lucidum | 1 | Not Listed | |
| Buckwheat, prostrate | Eriogonum prociduum | 1 | Not Listed | |
| Buckwheat, Red Mountain | Eriogonum kelloggii | 8 | C | |
| Buckwheat, Reveal's | Eriogonum contiguum | 1 | Not Listed | |
| Buckwheat, robust Hoffmann's | Eriogonum hoffmannii robustius | 1 | Not Listed | |
| Buckwheat, San Clemente Island | Eriogonum giganteum formosum | 1 | Not Listed | |
| Buckwheat, San Miguel Island | Eriogonum grande dunklei | 1 | Not Listed | |
| Buckwheat, San Nicolas Island | Eriogonum grande timorum | 1 | Not Listed | |
| Buckwheat, Santa Barbara Island | Eriogonum giganteum compactum | 1 | Not Listed | |
| Buckwheat, Santa Paula | Eriogonum parvifolium paynei | 1 | Not Listed | |
| Buckwheat, scrub | Eriogonum longifolium var. gnaphalifolium | 4 | T | |
| Buckwheat, Siskiyou | Eriogonum siskiyouense | 1 | Not Listed | |
| Buckwheat, Snow Mountain | Eriogonum nervulosum | 1 | Not Listed | |
| Buckwheat, steamboat | Eriogonum ovalifolium var. williamsiae | 8 | E | |
| Buckwheat, sulfur-flowered, alpine | Eriogonum umbellatum minus | 1 | Not Listed | |
| Buckwheat, Sulphur Springs | Eriogonum argophyllum | 8 | Not Listed | |
| Buckwheat, Temblor | Eriogonum temblorense | 1 | Not Listed | |
| Buckwheat, The Needles | Eriogonum breedlovei shevockii | 1 | Not Listed | |
| Buckwheat, Thorne's | Eriogonum ericifolium thornei | 1 | Not Listed | |
| Buckwheat, Tiburon | Eriogonum caninum | 1 | Not Listed | |
| Buckwheat, Tiehm's | Eriogonum tiehmii | 1 | Not Listed | |
| Buckwheat, Trinity | Eriogonum alpinum | 1 | Not Listed | |
| Buckwheat, Twisselmann's | Eriogonum twisselmannii | 1 | Not Listed | |
| Buckwheat, Umtanum Desert | Eriogonum codium | 1 | PT | |
| Buckwheat, [unnamed] | Eriogonum anemophilum | 1 | Not Listed | |
| Buckwheat, [unnamed] | Eriogonum lemmonii | 1 | Not Listed | |
| Buckwheat, [unnamed] | Eriogonum meledonum | 1 | Not Listed | |
| Buckwheat, [unnamed] | Eriogonum viscidulum | 8 | Not Listed | |
| Buckwheat, Waldo | Eriogonum pendulum | 1 | Not Listed | |
| Buckwheat, Wild Rose Canyon | Eriogonum eremicola | 1 | Not Listed | |
| Bug, Aaa water treader | Cavaticovelia aaa | Entire | 1 | Not Listed |
| Bug, annectans rhopalid | Ithamar annectans | Entire | 1 | Not Listed |
| Bugbane, Arizona | Cimicifuga arizonica | 2 | Not Listed | |
| Bugbane, Tall | Cimicifuga elata | 1 | Not Listed | |
| Bug, Belfragi's chlorochroan | Chlorochroa belfragi | Entire | 3 | Not Listed |
| Bug, Dismal Swamp chlorochroan | Chlorochroa dismalia | Entire | 5 | Not Listed |
| Bug, Dry Creek cliff strider | Oravelia pege | Entire | 1 | Not Listed |
| Bug, Hawaiian rhopalid | Ithamar hawaiiense | Entire | 1 | Not Listed |
| Bug, Lanai kalanian leaf | Kalania hawaiiensis | Entire | 1 | Not Listed |
| Bug, Oahu kalanian leaf | Kalania sp. | Entire | 1 | Not Listed |
| Bug, phyllostegian leaf | Cyrtopeltis phyllostegiae | Entire | 1 | Not Listed |
| Bug, Santa Rita Mountains chlorochroan | Chlorochroa rita | Entire | 2 | Not Listed |
| Bug, Saratoga Springs belostoman | Belostoma saratogae | Entire | 1 | Not Listed |
| Bugseed Boat-shaped | Corispermum navicula | 6 | UR | |
| Bug, Wekiu | Nysius wekiuicola | Entire | 1 | Not Listed |
| Bug, Wilbur Springs shore | Saldula usingeri | Entire | 1 | Not Listed |
| Bulbul, Mauritius olivaceous | Hypsipetes borbonicus olivaceus | Entire | Foreign | E |
| Bullfinch, Sao Miguel (finch) | Pyrrhula pyrrhula murina | Entire | Foreign | E |
| Bullrush, [unnamed] | Scirpus hallii | 3 | Not Listed | |
| Bully, Everglades | Sideroxylon reclinatum ssp. austrofloridense | 4 | C | |
| Bully, Everglades | Sideroxylon reclinatum var. austrofloridense | 4 | Not Listed | |
| Bulrush, Long's | Scirpus longii | 5 | Not Listed | |
| Bulrush, Northeastern | Scirpus ancistrochaetus | 5 | E | |
| Bulrush, reclining | Scirpus flaccidifolius | 4 | Not Listed | |
| Bumblebee, Franklin's | Bombus franklini | Entire | 1 | UR |
| Bundleflower, ruby | Desmanthus bicornutus | 2 | Not Listed | |
| Bunting, eastern painted | Passerina ciris ciris | Entire | 4 | Not Listed |
| Bunting, McKay's | Plectrophenax hyperboreus | Entire | 7 | Not Listed |
| Burbot, Kootenai River | Lota lota | Entire | 1 | UR |
| Bur-marigold, Maryland | Bidens bidentoides mariana | 5 | Not Listed | |
| Bur-marigold, [unnamed] | Bidens bidentoides bidentoides | 5 | Not Listed | |
| Bush-clover, prairie | Lespedeza leptostachya | 3 | T | |
| Bush lupine, Mountains Springs | Lupinus excubitus medius | 1 | Not Listed | |
| Bush-mallow, Abbott's | Malacothamnus abbottii | 1 | Not Listed | |
| bush mallow, Arcuate | malacothamnus arcuatus | 6 | Not Listed | |
| Bush-mallow, Arroyo Seco | Malacothamnus palmeri lucianus | 1 | Not Listed | |
| Bush-mallow, Carmel Valley | Malacothamnus palmeri involucratus | 1 | Not Listed | |
| Bush-mallow, Davidson's | Malacothamnus davidsonii | 1 | Not Listed | |
| Bush-mallow, Mendocino | Malacothamnus mendocinensis | 1 | Not Listed | |
| Bush-mallow, Palmer's | Malacothamnus palmeri palmeri | 1 | Not Listed | |
| Bush-mallow, Parish's | Malacothamnus parishii | 1 | Not Listed | |
| Bush-mallow, San Clemente Island | Malacothamnus clementinus | 8 | E | |
| Bush-mallow, Santa Cruz Island | Malacothamnus fasciculatus var. nesioticus | 8 | E | |
| Bush monkeyflower, low | Diplacus aridus | 1 | Not Listed | |
| Bush-pea, [unnamed] | Genistidium dumosum | 2 | Not Listed | |
| Bush-shrike, Ulugura | Malaconotus alius | Entire | Foreign | T |
| Bushwren, New Zealand | Xenicus longipes | Entire | Foreign | E |
| Bustard, great Indian | Ardeotis (=Choriotis) nigriceps | Entire | Foreign | E |
| Bustard, long-legged | Sypheotides indica | Entire | NA | Not Listed |
| Buttercup, autumn | Ranunculus aestivalis (=acriformis) | 6 | E | |
| Buttercup, Bladen | Ranunculus subcordatus | 4 | Not Listed | |
| Buttercup, [unnamed] | Ranunculus inamoenus subaffinis | 2 | Not Listed | |
| Butterfly, alamosa satyr | Cercyonis meadi alamosa | Entire | 6 | Not Listed |
| Butterfly, Andrew's marble | Euchloe hyantis andrewsi | Entire | 1 | Not Listed |
| Butterfly, Apache silverspot | Speyeria nokomis apacheana | Entire | 1 | Not Listed |
| Butterfly, Bahama swallowtail | Heraclides andraemon bonhotei | Entire | 4 | DA |
| Butterfly, Bartram's hairstreak | Strymon acis bartrami | Entire | 4 | C |
| Butterfly, bay checkerspot | Euphydryas editha bayensis | Entire | 8 | T |
| Butterfly, Behren's silverspot | Speyeria zerene behrensii | Entire | 8 | E |
| Butterfly, blueblack silverspot | Speyeria nokomis nigrocaerulea | Entire | 2 | Not Listed |
| Butterfly, bog elfin | Incisalia lanoraieensis | Entire | 5 | Not Listed |
| Butterfly, callippe silverspot | Speyeria callippe callippe | Entire | 8 | E |
| Butterfly, Catalina orange tip | Anthocharis cethura catalina | Entire | 1 | Not Listed |
| Butterfly, chryxus arctic | Oeneis chryxus valerata | Entire | 1 | Not Listed |
| Butterfly, Clemence's fritillary | Speyeria adiaste clemencei | Entire | 1 | Not Listed |
| Butterfly, clouded tailed copper | Lycaena arota nubila | Entire | 1 | Not Listed |
| Butterfly, Comstock's blue | Euphilotes battoides comstocki | Entire | 1 | Not Listed |
| Butterfly, Corsican swallowtail | Papilio hospiton | Entire | Foreign | E |
| Butterfly, Doudoroff's elfin | Incisalia mossi windi | Entire | 1 | Not Listed |
| Butterfly, El Segundo blue | Euphilotes battoides allyni | Entire | 8 | E |
| Butterfly, Esperanza swallowtail | Papilio esperanza | Entire | NA | UR |
| Butterfly, Fender's blue | Icaricia icarioides fenderi | Entire | 1 | E |
| Butterfly, Florida atala | Eumaeus atala florida | Entire | 4 | Not Listed |
| Butterfly, Florida leafwing | Anaea troglodyta floridalis | Entire | 4 | C |
| Butterfly, Fluminense swallowtail | Parides ascanius | Entire | Foreign | UR |
| Butterfly, Hahnel's Amazonian swallowtail | Parides hahneli | Entire | Foreign | UR |
| Butterfly, Harris' mimic swallowtail | Eurytides lysithous harrisianus | Entire | Foreign | UR |
| Butterfly, Hawaiian hairstreak | Vaga blackburni | Entire | 1 | Not Listed |
| Butterfly, helios yellow | Eurema dina helios | Entire | 4 | Not Listed |
| Butterfly, Hessel's hairstreak | Mitoura hesseli | Entire | 5 | Not Listed |
| Butterfly, Homerus swallowtail | Papilio homerus | Entire | Foreign | E |
| Butterfly, Hydaspe fritillary | Speyeria hydaspe conquista | Entire | 6 | Not Listed |
| Butterfly, Island large marble | Euchloe ausonides insulanus | Entire | 1 | Not Listed |
| Butterfly, Jamaican kite swallowtail | Eurytides marcellinus | Entire | Foreign | UR |
| Butterfly, Kaiser-I-Hind swallowtail | Teinopalpus imperialis | Entire | Foreign | UR |
| Butterfly, Karner blue | Lycaeides melissa samuelis | Entire | 3 | E |
| Butterfly, Kendall's yucca skipper | Megathymus coloradensis kendalli | Entire | 2 | Not Listed |
| Butterfly, Lange's metalmark | Apodemia mormo langei | Entire | 8 | E |
| Butterfly, Langston's blue | Euphilotes enoptes langstoni | Entire | 1 | Not Listed |
| Butterfly, lotis blue | Lycaeides argyrognomon lotis | Entire | 8 | E |
| Butterfly, Luzon peacock swallowtail | Papilio chikae | Entire | Foreign | E |
| Butterfly, Mariana eight-spot | Hypolimnas octocula mariannensis | Entire | 1 | C |
| Butterfly, Marianas euploea | Euploea eleutho | Entire | 1 | Not Listed |
| Butterfly, Mariana wandering | Vagrans egistina | Entire | 1 | C |
| Butterfly, Miami Blue | Cyclargus (=Hemiargus) thomasi bethunebakeri | Entire | 4 | E |
| Butterfly, minute checkerspot | Poladryas minuta minuta | Entire | 2 | Not Listed |
| Butterfly, mission blue | Icaricia icarioides missionensis | Entire | 8 | E |
| Butterfly, Mitchell's satyr | Neonympha mitchellii mitchellii | Entire | 3 | E |
| butterfly, Morro Bay blue | Icaricia icarioides moroensis | Entire | 1 | Not Listed |
| Butterfly, mountain silverspot | Speyeria nokomis nitocris | Entire | 2 | Not Listed |
| Butterfly, Mount Charleston blue | Plebejus shasta charlestonensis | Entire | 8 | C |
| Butterfly, Myrtle's silverspot | Speyeria zerene myrtleae | Entire | 8 | E |
| Butterfly, New Guinea birdwing | Ornithoptera meridionalis | Entire | NA | UR |
| Butterfly, obsolete viceroy | Limenitis archippus obsoletus | Entire | 1 | Not Listed |
| Butterfly, Oregon silverspot | Speyeria zerene hippolyta | Entire | 1 | T |
| Butterfly, Oso Flaco patch | Chlosyne leanira osoflaco | Entire | 1 | Not Listed |
| Butterfly, Palos Verdes blue | Glaucopsyche lygdamus palosverdesensis | Entire | 8 | E |
| Butterfly-pea, [unnamed] | Centrosema arenicola | 4 | Not Listed | |
| Butterfly plant, Colorado | Gaura neomexicana var. coloradensis | 6 | T | |
| Butterfly, Puerto Rico harlequin | Atlantea tulita | Entire | 4 | C |
| Butterfly, Queen Alexandra's birdwing | Troides (=Omithoptara) alexandrae | Entire | Foreign | E |
| Butterfly, Quino checkerspot | Euphydryas editha quino (=E. e. wrighti) | Entire | 8 | E |
| Butterfly, Sacramento Mountains checkerspot | Euphydryas anicia cloudcrofti | Entire | 2 | Not Listed |
| Butterfly, Saint Francis' satyr | Neonympha mitchellii francisci | Entire | 4 | E |
| Butterfly, San Bruno elfin | Callophrys mossii bayensis | Entire | 8 | E |
| Butterfly, Sand Mountain blue | Euphilotes pallescens arenamontana | entire | 8 | Not Listed |
| Butterfly, Schaus swallowtail | Heraclides aristodemus ponceanus | Entire | 4 | E |
| Butterfly, Smith's blue | Euphilotes enoptes smithi | Entire | 8 | E |
| Butterfly, smoky eyed brown | Satyrodes eurydice fumosa | Entire | 6 | Not Listed |
| Butterfly, Spring Mountains acastus checkerspot | Chlosyne acastus robusta | Entire | 8 | UR |
| butterfly, Spring Mountains comma skipper | hesperia comma ssp. mojavensis | Entire | 2 | Not Listed |
| Butterfly, swallowtail | Battus zetides | Entire | NA | Not Listed |
| Butterfly, swallowtail | Eurytides iphitas | Entire | NA | Not Listed |
| Butterfly, swallowtail | Graphium levassori | Entire | NA | Not Listed |
| Butterfly, swallowtail | Graphium sandawanum | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio benguetanus | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio carolinensis | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio desmondi teita | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio himeros | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio leucotaenia | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio maraho | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio moerneri | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio morondavana | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio neumoegeni | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio osmana | Entire | NA | Not Listed |
| Butterfly, swallowtail | Papilio phorbanta | Entire | NA | Not Listed |
| Butterfly, swallowtail | Parides burchellanus | Entire | NA | Not Listed |
| Butterfly, swallowtail | Parides jophon | Entire | NA | Not Listed |
| Butterfly, swallowtail | Parides schadenberqi | Entire | NA | Not Listed |
| Butterfly, swallowtail | Troides croesus | Entire | NA | Not Listed |
| Butterfly, swallowtail | Troides dohertyi | Entire | NA | Not Listed |
| Butterfly, Uncompahgre fritillary | Boloria acrocnema | Entire | 6 | E |
| Butterfly, Wind's elfin | Incisalia mossi doudoroffi | Entire | 1 | Not Listed |
| Butternut | Juglans cinerea | 4 | Not Listed | |
| Butterweed, Gander | Senecio ganderi | 1 | Not Listed | |
| Butterweed, Layne's | Senecio layneae | 8 | T | |
| Butterweed, Red Hills | Senecio clevelandii heterophyllus | 1 | Not Listed | |
| Butterweed, San Bernardino | Senecio bernardinus | 1 | Not Listed | |
| Butterwort, Chapman's | Pinguicula planifolia | 4 | Not Listed | |
| Butterwort, Godfrey's | Pinguicula ionantha | 4 | T | |
| Button cactus, Boke's | Epithelantha bokei | 2 | Not Listed | |
| Button-celery, Hoover's | Eryngium aristulatum hooveri | 1 | Not Listed | |
| Button-celery, San Diego | Eryngium aristulatum var. parishii | 8 | E | |
| Button-clery, Pendleton | Eryngium pendletonensis | 1 | Not Listed | |
| Button, Mohr's Barbara | Marshallia mohrii | 4 | T | |
| Buttons, tiny bog | Lachnocaulon digynum | 4 | Not Listed | |
| Cactus, Acuna | Echinomastus erectocentrus var. acunensis | 2 | C | |
| Cactus, Arizona hedgehog | Echinocereus triglochidiatus var. arizonicus | 2 | E | |
| Cactus, Bakersfield | Opuntia treleasei | 8 | E | |
| Cactus, black lace | Echinocereus reichenbachii var. albertii | 2 | E | |
| Cactus, Brady pincushion | Pediocactus bradyi | 2 | E | |
| Cactus, butterfly, Gaut's | Neolloydia gautii | 2 | Not Listed | |
| Cactus, Chisos Mountain hedgehog | Echinocereus chisoensis var. chisoensis | 2 | T | |
| Cactus, Cochise pincushion | Coryphantha robbinsorum | 2 | T | |
| Cactus, Colorado hookless | Sclerocactus glaucus | 6 | T | |
| Cactus, Fickeisen plains | Pediocactus peeblesianus fickeiseniae | 2 | C | |
| Cactus, Florida semaphore | Consolea corallicola | 4 | C | |
| cactus, Foxtail | escobaria alversonii | 6 | Not Listed | |
| Cactus, Hoffmann's | Opuntia bigelovii hoffmannii | 1 | Not Listed | |
| Cactus, Kaibab plains | Pediocactus paradinei | 2 | Not Listed | |
| Cactus, Key tree | Pilosocereus robinii | 4 | E | |
| Cactus, Knowlton's | Pediocactus knowltonii | 2 | E | |
| Cactus, Kuenzler hedgehog | Echinocereus fendleri var. kuenzleri | 2 | E | |
| Cactus, Lee pincushion | Coryphantha sneedii var. leei | 2 | T | |
| Cactus, Lloyd's hedgehog | Echinocereus lloydii | 2 | DO | |
| Cactus, Lloyd's Mariposa | Echinomastus mariposensis | 2 | T | |
| Cactus, Mesa Verde | Sclerocactus mesae-verdae | 2 | T | |
| Cactus, Nellie cory | Coryphantha minima | 2 | E | |
| Cactus, Nichol's Turk's head | Echinocactus horizonthalonius var. nicholii | 2 | E | |
| Cactus, paper-spined | Pediocactus papyracanthus | 2 | Not Listed | |
| cactus, Pariette | Sclerocactus brevispinus | 6 | T | |
| Cactus, Peebles Navajo | Pediocactus peeblesianus var. peeblesianus | 2 | E | |
| Cactus, Pima pineapple | Coryphantha scheeri var. robustispina | 2 | E | |
| Cactus, San Rafael | Pediocactus despainii | 6 | E | |
| Cactus, Santa Cruz beehive | Coryphantha recurvata | 2 | Not Listed | |
| Cactus, Siler pincushion | Pediocactus (=Echinocactus,=Utahia) sileri | 2 | T | |
| Cactus, Sneed pincushion | Coryphantha sneedii var. sneedii | 2 | E | |
| Cactus, spineless hedgehog | Echinocereus triglochidiatus var. inermis | 6 | DO | |
| Cactus, star | Astrophytum asterias | 2 | E | |
| Cactus, Tobusch fishhook | Ancistrocactus tobuschii | 2 | E | |
| cactus, Uinta Basin hookless | Sclerocactus wetlandicus | 6 | T | |
| Cactus, Winkler | Pediocactus winkleri | 6 | T | |
| Cactus, Wright fishhook | Sclerocactus wrightiae | 6 | E | |
| Caddisfly, Abellan hydropsyche | Hydropsyche abella | Entire | 1 | Not Listed |
| Caddisfly, Alexander's rhyacophilan | Rhyacophila alexanderi | Entire | 6 | Not Listed |
| Caddisfly, amphibious | Desmona bethula | Entire | 1 | Not Listed |
| Caddisfly, Arkansas agapetus | Agapetus medicus | Entire | 4 | Not Listed |
| Caddisfly, artesian agapetus | Agapetus artesus | Entire | 3 | Not Listed |
| Caddisfly, Athens long-horned | Triaenodes phalacris | Entire | 3 | Not Listed |
| Caddisfly, Balmorhea saddle-case | Protoptila balmorhea | Entire | 2 | Not Listed |
| Caddisfly, Bilobed rhyacophilan | Rhyacophila mosana | Entire | 1 | Not Listed |
| Caddisfly, Blue Mountains cryptochian | Cryptochia neosa | Entire | 1 | Not Listed |
| Caddisfly, Buffalo Springs | Ceratopsyche etnieri | Entire | 4 | Not Listed |
| Caddisfly, Cahaba saddle-case | Protoptila cahabensis | Entire | 4 | Not Listed |
| Caddisfly, California diplectronan | Diplectrona californica | Entire | 1 | Not Listed |
| Caddisfly, Carlson's polycentropus | Polycentropus carlsoni | Entire | 4 | Not Listed |
| Caddisfly, Cascades apatanian | Apatania tavala | Entire | 1 | Not Listed |
| Caddisfly, Castle Crags rhyacophilan | Rhyacophila lineata | Entire | 1 | Not Listed |
| Caddisfly, Castle Lake rhyacophilan | Rhyacophila amabilis | Entire | 1 | Not Listed |
| Caddisfly, Clatsop philocascan | Philocasca oron | Entire | 1 | Not Listed |
| Caddisfly, Cold Spring | Lepidostoma ermanae | Entire | 1 | Not Listed |
| Caddisfly, Columbia Gorge neothremman | Neothremma andersoni | Entire | 1 | Not Listed |
| Caddisfly, confusion | Cryptochia shasta | Entire | 1 | Not Listed |
| Caddisfly, Denning's agapetus | Agapetus denningi | Entire | 1 | Not Listed |
| Caddisfly, Denning's cryptic | Cryptochia denningi | Entire | 1 | Not Listed |
| Caddisfly, Fender's rhyacophilan | Rhyacophila fenderi | Entire | 1 | Not Listed |
| Caddisfly, Fischer's lelpidostoman | Lepidostoma fischeri | Entire | 1 | Not Listed |
| Caddisfly, Flint's net-spinning | Cheumatopsyche flinti | Entire | 2 | Not Listed |
| Caddisfly, Florida ceraclean longhorn | Ceraclea floridana | Entire | 4 | Not Listed |
| Caddisfly, Fort Dick limnephilus | Limnephilus atercus | Entire | 1 | Not Listed |
| Caddisfly, Goeden's lepidostoman | Lepidostoma goedeni | Entire | 1 | Not Listed |
| Caddisfly, golden-horned | Neothremma genella | Entire | 1 | Not Listed |
| Caddisfly, Green Springs Mountain farulan | Farula davisi | Entire | 1 | Not Listed |
| Caddisfly, Haddock's rhyacophilan | Rhyacophila haddocki | Entire | 1 | Not Listed |
| Caddisfly, headwater chilostigman | Chilostigma itascae | Entire | 3 | Not Listed |
| Caddisfly, Helma's net-spinning | Cheumatopsyche helma | Entire | 5 | Not Listed |
| Caddisfly, Kings Canyon cryptochian | Cryptochia excella | Entire | 1 | Not Listed |
| Caddisfly, King's Creek ecclisomyian | Ecclisomyia bilera | Entire | 1 | Not Listed |
| Caddisfly, King's Creek parapsyche | Parapsyche extensa | Entire | 1 | Not Listed |
| Caddisfly, Klamath limnephilan | Limnephilus alconura | Entire | 1 | Not Listed |
| Caddisfly, Lenat's ceraclean | Ceraclea sp. | Entire | 4 | Not Listed |
| Caddisfly, little oecetis longhorn | Oecetis parva | Entire | 4 | Not Listed |
| Caddisfly, long-tailed | Farula sp. | Entire | 1 | Not Listed |
| Caddisfly, Missouri glyphopsyche | Glyphopsyche missouri | Entire | 3 | Not Listed |
| Caddisfly, Morse's net-spinning | Cheumatopsyche morsei | Entire | 4 | Not Listed |
| Caddisfly, Mt. Hood farulan | Farula jewetti | Entire | 1 | Not Listed |
| Caddisfly, Mt. Hood primitive brachycentrid | Eobrachycentrus gelidae | Entire | 1 | Not Listed |
| Caddisfly, nearctic paduniellan | Paduniella nearctica | Entire | 4 | Not Listed |
| Caddisfly, Obrien rhyacophilan | Rhyacophila colonus | Entire | 1 | Not Listed |
| Caddisfly, one-spot rhyacophilan | Rhyacophila unipunctata | Entire | 1 | Not Listed |
| Caddisfly, Oregon dolophilodes | Dolophilodes oregona | Entire | 1 | Not Listed |
| Caddisfly, Reisen's hydropsyche | Hydropsyche reiseni | Entire | 2 | Not Listed |
| Caddisfly, Rogue Creek hydroptila | Hydroptila okaloosa | Entire | 4 | Not Listed |
| Caddisfly, Sagehen Creek goeracean | Goeracea oregona | Entire | 1 | Not Listed |
| Caddisfly, San Marcos saddle-case | Protoptila arca | Entire | 2 | Not Listed |
| Caddisfly, Sarah's hydroptila | Hydroptila sarahae | Entire | 4 | Not Listed |
| Caddisfly, Schuh's homoplectran | Homoplectra schuhi | Entire | 1 | Not Listed |
| Caddisfly, Sequatchie | Glyphopsyche sequatchie | Entire | 4 | C |
| Caddisfly, Siskiyou | Neothremma siskiyou | Entire | 1 | Not Listed |
| Caddisfly, Siskiyou | Tinodes siskiyou | Entire | 1 | Not Listed |
| Caddisfly, spiny rhyacophilan | Rhyacophila spinata | Entire | 1 | Not Listed |
| Caddisfly, Stannard's agarodes | Agarodes stannardi | Entire | 4 | Not Listed |
| Caddisfly, Texas austrotinodes | Austrotinodes sp. | Entire | 2 | Not Listed |
| Caddisfly, three-tooth long-horned | Triaenodes tridonta | Entire | 4 | Not Listed |
| Caddisfly, Tombstone Prairie farulan | Farula reaperi | Entire | 1 | Not Listed |
| Caddisfly, Tombstone Prairie oligophlebodes | Oligophlebodes mostbento | Entire | 1 | Not Listed |
| Caddisfly, [unnamed] | Agapetus jocassee | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Agarodes alabamensis | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Ceraclea enodis | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Chimarra holzenthali | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Diplectrona rossi | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Helicopsyche paralimnella | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Hydroptila chelops | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Hydroptila englishi | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Hydroptila lagoi | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Hydroptila ouachita | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Lepidostoma etnieri | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Ochotrichia elongiralla | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Polycentropus harrisi | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Psilotreta hansoni | Entire | 5 | Not Listed |
| Caddisfly, [unnamed] | Setodes epicampes | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Stactiobiella cahaba | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Theliopsyche tallapoosa | Entire | 4 | Not Listed |
| Caddisfly, [unnamed] | Wormaldia oconee | Entire | 4 | Not Listed |
| Caddisfly, Vannote's net-spinning | Cheumatopsyche vannotei | Entire | 5 | Not Listed |
| Caddisfly, Vertrees's ceraclean | Ceraclea vertreesi | Entire | 1 | Not Listed |
| Caddisfly, zigzag blackwater | Agarodes ziczac | Entire | 4 | Not Listed |
| Caiman, Apaporis River | Caiman crocodilus apaporiensis | Entire | Foreign | E |
| Caiman, black | Melanosuchus niger | Entire | Foreign | E |
| Caiman, broad-snouted | Caiman latirostris | Entire | Foreign | E |
| Caiman, brown | Caiman crocodilus fuscus (includes Caiman crocodilus chiapasius) | Entire | Foreign | SAT |
| Caiman, common | Caiman crocodilus crocodilus | Entire | Foreign | SAT |
| Caiman, Yacare | Caiman yacare | Entire | Foreign | T |
| California-lilac, maritime | Ceanothus maritimus | 1 | Not Listed | |
| Caltrop, perennial | Kallstroemia perennans | 2 | Not Listed | |
| Camasey, Petites Graines | Graffenrieda ottoschulzii | 4 | Not Listed | |
| Camassia, Leichtlin | Camassia leichtlinii leichtlinii | 1 | Not Listed | |
| Camel, Bactrian | Camelus bactrianus | Entire | Foreign | E |
| Camel cricket, Tanner's black | Utabaenetes tanneri | Entire | 6 | Not Listed |
| Campanula, Castle Crags | Campanula shetleri | 1 | Not Listed | |
| Campeloma, slender | Campeloma decampi | Entire | 4 | E |
| Campion, fringed | Silene polypetala | 4 | E | |
| Campion, Mission Dolores | Silene verecunda verecunda | 1 | UR | |
| Campylopus, savannah | Campylopus carolinae | 4 | Not Listed | |
| Capa rosa | Callicarpa ampla | 4 | E | |
| Capercaillie, Cantabrian | Tetrao urogallus cantabricus | Entire | 9 | E |
| Capshell, Rocky Mountain | Acroloxus coloradensis | Entire | 6 | Not Listed |
| Caracara, Audubon's crested | Polyborus plancus audubonii | U.S.A. (FL) | 4 | T |
| Carelia, spp. (ca 12) | Carelia spp. (ca 12) | Entire | 1 | Not Listed |
| Caribou, Dolphin-Union | Rangifer tarandus ssp. groenlandicus | Entire | Foreign | UR |
| Caribou, Peary | Rangifer tarandus pearyi | Entire | Foreign | UR |
| Caribou, woodland | Rangifer tarandus caribou | U.S.A. (ID, WA), Canada (that part of S.E. British Columbia bounded by the U.S.-Can. border, Columbia R., Kootenay R., Kootenay L., and Kootenai R.) | 1 | E |
| Carpenteria, [unnamed] | Carpenteria californica | 1 | Not Listed | |
| Carposinid moth, green | Carposina viridis | Entire | 1 | Not Listed |
| Casebearer moth, chestnut | Coleophora leucochrysella | Entire | 5 | Not Listed |
| Cat, Andean | Felis jacobita | Entire | Foreign | E |
| Cat, Asian golden (=Temmnick's) | Catopuma (=Felis) temminckii | Entire | Foreign | E |
| Cat, black-footed | Felis nigripes | Entire | Foreign | E |
| Catchfly, Blue Ridge | Silene ovata | 4 | Not Listed | |
| Catchfly, Butte County | Silene occidentalis longistipitata | 1 | Not Listed | |
| Catchfly, cascade head | Silene douglasii oraria | 1 | Not Listed | |
| Catchfly, Grand Canyon | Silene rectiramea | 2 | Not Listed | |
| Catchfly, Jan's | Silene nachlingerae | 1 | Not Listed | |
| Catchfly, Marble Mountain | Silene marmorensis | 1 | Not Listed | |
| Catchfly, Plank's | Silene plankii | 2 | Not Listed | |
| Catchfly, plateau | Silene petersonii | 6 | Not Listed | |
| Catchfly, Red Canyon | Silene petersonii minor | 6 | Not Listed | |
| Catchfly, red fir | Silene invisa | 1 | Not Listed | |
| Catchfly, Red Mountain | Silene campanulata campanulata | 1 | Not Listed | |
| Catchfly, royal | Silene regia | 3 | Not Listed | |
| Catchfly, scarlet | Silene subciliata | 2 | Not Listed | |
| Catchfly, Spalding's | Silene spaldingii | 1 | T | |
| Catchfly, [unnamed] | Silene virginica robusta | 5 | Not Listed | |
| Catfish | Pangasius sanitwongsei | Entire | Foreign | E |
| Catfish, Chihuahua | Ictalurus sp. | Entire | 2 | Not Listed |
| Catfish, headwater | Ictalurus lupus | Entire | 2 | Not Listed |
| Catfish, Thailand giant | Pangasianodon gigas | Entire | Foreign | E |
| Catfish, Yaqui | Ictalurus pricei | Entire | 2 | T |
| Cat, flat-headed | Prionailurus (=Felis) planiceps | Entire | Foreign | E |
| Catfoot, saxicola rock | Gnaphalium obtusifolium saxicola | 3 | Not Listed | |
| Cat, Iriomote | Prionailurus (=Felis) bengalensis iriomotensis | Entire | Foreign | E |
| Cat, leopard | Prionailurus (=Felis) bengalensis bengalensis | Entire | Foreign | E |
| Cat, marbled | Pardofelis (=Felis) marmorata | Entire | Foreign | E |
| Cat, Pakistan sand | Felis margarita scheffeli | Entire | Foreign | E |
| Catseye, Atwood's | Cryptantha atwoodii | 2 | Not Listed | |
| Catseye, Barneby | Cryptantha barnebyi | 6 | Not Listed | |
| Catseye, bristlecone | Cryptantha roosiorum | 1 | Not Listed | |
| Catseye, cliffdweller's candlestick | Cryptantha elata | 6 | Not Listed | |
| Catseye, compact | Cryptantha compacta | 6 | Not Listed | |
| Catseye, Graham | Cryptantha grahamii | 6 | Not Listed | |
| Catseye, Grand Junction | Cryptantha aperta | 6 | Not Listed | |
| Catseye, Johnston | Cryptantha johnstonii | 6 | Not Listed | |
| Catseye, Jones | Cryptantha jonesiana | 6 | Not Listed | |
| Cat's-eye, Terlingua Creek | Cryptantha crassipes | 2 | E | |
| Catseye, [unnamed] | Cryptantha breviflora | 1 | Not Listed | |
| Catseye, [unnamed] | Cryptantha insolita | 1 | Not Listed | |
| Catseye, [unnamed] | Cryptantha semiglabra | 2 | UR | |
| Catseye, [unnamed] | Cryptantha shackletteana | 7 | Not Listed | |
| Catseye, [unnamed] | Cryptantha sobolifera | 6 | Not Listed | |
| Catseye, [unnamed] | Cryptantha stricta | 6 | Not Listed | |
| Catseye, Weber's | Cryptantha weberi | 6 | Not Listed | |
| Catseye, yellow-white | Cryptantha ochroleuca | 6 | Not Listed | |
| Catspaw, narrow | Epioblasma lenior | Entire | 4 | Not Listed |
| Catspaw, white (pearlymussel) | Epioblasma obliquata perobliqua | Entire | 3 | E |
| Cat, tiger | Leopardus (=Felis) tigrinus | Entire | Foreign | E |
| Caulostramina, Jaeger's | Caulostramina jaegeri | 1 | Not Listed | |
| Cave beetle, Baker Station | Pseudanophthalmus insularis | Entire | 4 | C |
| Cave beetle, beaver | Pseudanophthalmus major | entire | 4 | Not Listed |
| Cave beetle, Benderman's | Pseudanophthalmus bendermani | Entire | 4 | Not Listed |
| Cave beetle, Blowing | Pseudanophthalmus ventus | Entire | 4 | Not Listed |
| Cave beetle, Cane Creek | Pseudanophthalmus occidentalis | Entire | 4 | Not Listed |
| Cave beetle, Catherine's | Pseudanophthalmus catherinae | Entire | 4 | Not Listed |
| Cave beetle, Clifton | Pseudanophthalmus caecus | Entire | 4 | C |
| Cave beetle, Clifton | Pseudanoptha caecus | Entire | NA | Not Listed |
| Cave beetle, coleman | Pseudanophthalmus colemanensis | Entire | 4 | C |
| Cave beetle, crossroads | Pseudanophthalmus intersectus | Entire | 5 | Not Listed |
| Cave beetle, Cudjo's | Pseudanophthalmus hirsutus | Entire | 5 | Not Listed |
| Cave beetle, deceptive | Pseudanophthalmus deceptivus | Entire | 5 | Not Listed |
| Cave beetle, Dry Fork Valley | Pseudanophthalmus montanus | Entire | 5 | Not Listed |
| Cave beetle, Endless Caverns | Pseudanophthalmus avernus | Entire | 5 | Not Listed |
| Cave beetle, Engelhardt's | Pseudanophthalmus engelhardti | Entire | 4 | Not Listed |
| Cave beetle, Flyn's hick | Pseudanophthalmus simplex | Entire | 4 | Not Listed |
| Cave beetle, Fowler's | Pseudanophthalmus fowlerae | Entire | 4 | C |
| Cave beetle, garden | Pseudanophthalmus hortulanus | Entire | 5 | Not Listed |
| Cave beetle, Georgian | Pseudanophthalmus georgiae | Entire | 4 | Not Listed |
| Cave beetle, Grassy Cove | Pseudanophthalmus jonesi | Entire | 4 | Not Listed |
| Cave beetle, greater Adams | Pseudanophthalmus pholeter | Entire | 4 | Not Listed |
| Cave beetle, Greenbrier Valley | Pseudanophthalmus fuscus fuscus | Entire | 5 | Not Listed |
| Cave Beetle, Holsinger's | Pseudanophthalmus holsingeri | Entire | 5 | UR |
| Cave beetle, Hubbard's | Pseudanophthalmus hubbardi | Entire | 5 | Not Listed |
| Cave beetle, Hubricht's | Pseudanophthalmus hubrichti | Entire | 5 | Not Listed |
| Cave beetle, icebox | Pseudanophthalmus frigidus | Entire | 4 | C |
| Cave beetle, Illinois | Pseudanophthalmus illinoisensis | Entire | 3 | Not Listed |
| Cave beetle, Indian Grave Point (=Soothsayer) | Pseudanophthalmus tiresias | Entire | 4 | C |
| Cave beetle, inquirer | Pseudanophthalmus inquisitor | Entire | 4 | C |
| Cave beetle, Kramer's | Pseudanophthalmus krameri | Entire | 3 | Not Listed |
| Cave beetle, Lallemant's | Pseudanophthalmus lallemanti | Entire | 5 | Not Listed |
| Cave beetle, lesser Adams | Pseudanophthalmus cataryctos | Entire | 4 | Not Listed |
| Cave beetle, limestone | Pseudanophthalmus calcareus | Entire | 4 | Not Listed |
| Cave beetle, Little Kennedy | Pseudanophthalmus cordicollis | Entire | 5 | Not Listed |
| Cave beetle, long-headed | Pseudanophthalmus longiceps | Entire | 4 | Not Listed |
| Cave beetle, Louisville | Pseudanophthalmus troglodytes | Entire | 4 | C |
| Cave beetle, Maiden Spring | Pseudanophthalmus virginicus | Entire | 5 | Not Listed |
| Cave beetle, Martin | Pseudanophthalmus pusillus | Entire | 4 | Not Listed |
| Cave beetle, Maryland | Pseudanopthalmus sp. | Entire | 5 | Not Listed |
| Cave beetle, Meridith | Pseudanophthalmus sidus | Entire | 4 | Not Listed |
| Cave beetle, Mystic | Pseudanophthalmus hadenoecus | Entire | 5 | Not Listed |
| Cave beetle, Narrows | Pseudanophthalmus egberti | Entire | 5 | Not Listed |
| Cave beetle, Natural Bridge | Pseudanophthalmus pontis | Entire | 5 | Not Listed |
| Cave beetle, Nelson's | Pseudanophthalmus nelsoni | Entire | 5 | Not Listed |
| Cave beetle, New Mammoth Cave | Pseudanophthalmus scutilis | Entire | 4 | Not Listed |
| Cave beetle, Nobletts | Pseudanophthalmus paulus | Entire | 4 | C |
| Cave beetle, Norton's | Pseudanophthalmus nortoni | Entire | 4 | Not Listed |
| Cave beetle, Ohio | Pseudanophthalmus ohioensis | Entire | 3 | Not Listed |
| Cave beetle, overlooked | Pseudanophthalmus praetermissus | Entire | 5 | Not Listed |
| Cave beetle, pale | Pseudanophthalmus pallidus | Entire | 4 | Not Listed |
| Cave beetle, Payne's | Pseudanophthalmus paynei | Entire | 4 | Not Listed |
| Cave beetle, Petrunkevitch's | Pseudanophthalmus petrunkevitchi | Entire | 5 | Not Listed |
| Cave beetle, Rich Mountain | Pseudanophthalmus krekeleri | Entire | 5 | Not Listed |
| Cave beetle, Rogers' | Pseudanophthalmus rogersae | Entire | 4 | Not Listed |
| Cave beetle, Saint Paul | Pseudanophthalmus sanctipauli | Entire | 5 | Not Listed |
| Cave beetle, Sawmill Hollow | Pseudanophthalmus scholasticus | Entire | 4 | Not Listed |
| Cave beetle, Seneca | Pseudanophthalmus potomaca senecae | Entire | 5 | Not Listed |
| Cave beetle, Sensabush | Pseudanophthalmus paradoxus | Entire | 4 | Not Listed |
| Cave beetle, Sequoyah Caverns | Pseudanophthalmus sequoyah | Entire | 4 | Not Listed |
| Cave beetle, Shenandoah | Pseudanophthalmus limicola | Entire | 5 | Not Listed |
| Cave beetle, Silken | Pseudanophthalmus sericus | Entire | 5 | Not Listed |
| Cave beetle, South Branch Valley | Pseudanophthalmus potomaca potomaca | Entire | 5 | Not Listed |
| Cave beetle, spotted | Pseudanophthalmus punctatus | Entire | 5 | Not Listed |
| Cave beetle, stone-dwelling | Pseudanophthalmus hypolithos | Entire | 4 | Not Listed |
| Cave beetle, Straley's | Pseudanophthalmus quadratus | Entire | 5 | Not Listed |
| Cave beetle, surprising | Pseudanophthalmus inexpectatus | Entire | 4 | Not Listed |
| Cave beetle, tapered | Pseudanophthalmus fastigatus | Entire | 4 | Not Listed |
| Cave beetle, Tatum | Pseudanophthalmus parvus | Entire | 4 | C |
| Cave beetle, thin-neck | Pseudanophthalmus parvicollis | Entire | 5 | Not Listed |
| Cave beetle, Thomas' | Pseudanophthalmus thomasi | Entire | 5 | Not Listed |
| Cave beetle, Union County | Pseudanophthalmus unionis | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanophthalmus audax | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanophthalmus conditus | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanophthalmus exoticus | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanophthalmus globiceps | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanophthalmus horni | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanophthalmus puteanus | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanophthalmus simulans | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanophthalmus tenebrosus | Entire | 4 | Not Listed |
| Cave beetle, [unnamed] | Pseudanopthalmus gracilis | Entire | 5 | Not Listed |
| Cave beetle, [unnamed] | Pseudanopthalmus sylvaticus | Entire | 5 | Not Listed |
| Cave beetle, [unnamed] | Pseudanopthalmus vicarius | Entire | 5 | Not Listed |
| Cave beetle, Wallace's | Pseudanophthalmus wallacei | Entire | 4 | Not Listed |
| Cavefish, Alabama | Speoplatyrhinus poulsoni | Entire | 4 | E |
| Cavefish, northern | Amblyopsis spelaea | Entire | 3 | Not Listed |
| Cavefish, Ozark | Amblyopsis rosae | Entire | 4 | T |
| cavefish, Southern | typhlichthys subterraneus | Entire | 2 | Not Listed |
| Cavesnail, Greenbrier | Fontigens turritella | Entire | 5 | Not Listed |
| Cavesnail, mimic | Phreatodrobia imitata | Entire | 2 | Not Listed |
| Cavesnail, tapered | Fontigens holsingeri | Entire | 5 | Not Listed |
| Cavesnail, Tumbling Creek | Antrobia culveri | Entire | 3 | E |
| Ceanothus, Bolinas | Ceanothus masonii | 1 | Not Listed | |
| Ceanothus, Calistoga | Ceanothus divergens | 1 | Not Listed | |
| Ceanothus, coyote | Ceanothus ferrisae | 8 | E | |
| Ceanothus, Hearst's | Ceanothus hearstiorum | 1 | Not Listed | |
| Ceanothus, Lakeside | Ceanothus cyaneus | 1 | Not Listed | |
| Ceanothus, Monterey | Ceanothus cuneatus rigidus | 1 | Not Listed | |
| Ceanothus, Mt. Vision | Ceanothus gloriosus porrectus | 1 | Not Listed | |
| Ceanothus, Nipomo | Ceanothus impressus nipomensis | 1 | Not Listed | |
| Ceanothus, Pine Hill | Ceanothus roderickii | 8 | E | |
| Ceanothus, Rincon | Ceanothus confusus | 1 | Not Listed | |
| Ceanothus, Sonoma | Ceanothus sonomensis | 1 | Not Listed | |
| Ceanothus, [unnamed] | Ceanothus arboreus | 1 | Not Listed | |
| Ceanothus, Vail Lake | Ceanothus ophiochilus | 8 | T | |
| Ceanothus, Vine Hill | Ceanothus foliosus vineatus | 1 | Not Listed | |
| Ceanothus, wart-stemmed | Ceanothus verrucosus | 1 | Not Listed | |
| Centaury, spring-loving | Centaurium namophilum | 8 | T | |
| Chachalaca, Utila | Ortalis vetula | Entire | Foreign | UR |
| Chaenactis, Parish's | Chaenactis parishii | 1 | Not Listed | |
| Chaff-flower, round-leaved | Achyranthes splendens var. rotundata | 1 | E | |
| Chaffseed, American | Schwalbea americana | 5 | E | |
| Chamois, Apennine | Rupicapra rupicapra ornata | Entire | Foreign | E |
| chaparral, Shasta | Trilobopsis roperi | Entire | 8 | UR |
| chaparral, Tehama | Trilobopsis tehamana | Entire | 8 | Not Listed |
| chaparral, Tehama | Trilobopsis tehamana | Entire | 8 | Not Listed |
| chat, Yellow-breasted | icteria virens | Entire | 6 | Not Listed |
| Checkerbloom, Dwarf | Sidalcea malviflora ssp. virgata | 1 | Not Listed | |
| Checkerbloom, Parish's | Sidalcea hickmanii parishii | 8 | Not Listed | |
| Checkerbloom, Scadden Flat | Sidalcea stipularis | 1 | Not Listed | |
| Checkermallow, Del Norte | Sidalcea malviflora elegans | 1 | Not Listed | |
| Checkermallow, Henderson's | Sidalcea hendersonii | 1 | Not Listed | |
| Checker-mallow, Keck's | Sidalcea keckii | 8 | E | |
| Checker-mallow, Kenwood Marsh | Sidalcea oregana ssp. valida | 8 | E | |
| Checkermallow, Marin | Sidalcea hickmanii viridis | 1 | Not Listed | |
| Checkermallow, meadow | Sidalcea campestris | 1 | Not Listed | |
| Checker-mallow, Nelson's | Sidalcea nelsoniana | 1 | T | |
| Checkermallow, Owens Valley | Sidalcea covillei | 1 | Not Listed | |
| Checker-mallow, pedate | Sidalcea pedata | 8 | E | |
| Checkermallow, [unnamed] | Sidalcea malvaeflora patula | 1 | Not Listed | |
| Checkermallow, water-loving | Sidalcea oregana hydrophila | 1 | Not Listed | |
| Checkermallow, Wenatchee Mountains | Sidalcea oregana var. calva | 1 | E | |
| Checkerspot, mono | Euphydryas editha monoensis | Entire | 1 | Not Listed |
| Checkerspot, Morand's | Euphydryas anicia morandi | Entire | 1 | Not Listed |
| Checkerspot, Taylor's (=whulge) | Euphydryas editha taylori | Entire | 1 | C |
| Cheesebush Sanderson's | Hymenoclea sandersonii | 6 | Not Listed | |
| Cheetah | Acinonyx jubatus | Entire | Foreign | E |
| Chia, San Jacinto Mountains | Salvia columbariae ziegleri | 1 | Not Listed | |
| Chickweed | Stellaria irrigua | 6 | Not Listed | |
| Chickweed, Aleutian | Cerastium aleuticum | 7 | Not Listed | |
| Chickweed, field, long-hairy | Cerastium arvense villosissimum | 5 | Not Listed | |
| Chickweed, mouse-ear | Cerastium clawsonii | 2 | Not Listed | |
| Chimpanzee | Pan troglodytes | Wherever found in captivity | Foreign | T |
| Chimpanzee | Pan troglodytes | Wherever found in the wild | Foreign | E |
| Chimpanzee, pygmy | Pan paniscus | Entire | Foreign | E |
| Chinchilla | Chinchilla brevicaudata boliviana | Entire | Foreign | E |
| Chinch weed, beardless | Pectis imberbis | 2 | UR | |
| Chinquapin, Ozark | Castanea pumila ozarkensis | 4 | Not Listed | |
| Chipmunk, gray-footed | Tamias canipes | Entire | 2 | Not Listed |
| Chipmunk, Hidden Forest Uinta | Eutamias umbrinus nevadensis | Entire | 1 | Not Listed |
| Chipmunk, lodgepole | Tamias speciosus speciosus | Entire | 1 | Not Listed |
| Chipmunk, Mount Ellen Uinta | Tamias umbrinus sedulus | Entire | 6 | Not Listed |
| Chipmunk, Organ Mountains Colorado | Eutamias quadrivittatus australis | Entire | 2 | Not Listed |
| Chipmunk, Palmer's | Eutamias palmeri | Entire | 1 | Not Listed |
| Chipmunk, Penasco least | Tamias minimus atristriatus | Entire | 2 | UR |
| Cholla, Blue Diamond | Opuntia whipplei multigeniculata | 1 | Not Listed | |
| Cholla, Munz | Opuntia munzii | 1 | Not Listed | |
| Cholla, sand | Opuntia pulchella | 1 | Not Listed | |
| Cholla, Santa Fe | Opuntia viridiflora | 2 | Not Listed | |
| Cholla, silver | Opuntia imbricata argentea | 2 | Not Listed | |
| Cholla, snake | Opuntia parryi serpentina | 1 | Not Listed | |
| Cholla, Wiggins' | Opuntia wigginsii | 1 | Not Listed | |
| Christmas tree, desert | Pholisma arenarium | 1 | Not Listed | |
| Chub, Alvord | Gila alvordensis | Entire | 1 | Not Listed |
| Chub, Arkansas River speckled | Macrhybopsis aestivalis tetranemus | Entire | 2 | Not Listed |
| Chub, arroyo | Gila orcutti | Entire | 1 | Not Listed |
| Chub, Big Smoky Valley tui | Gila bicolor ssp. | Big Smoky | 1 | Not Listed |
| Chub, bonytail | Gila elegans | entire | 6 | E |
| Chub, Borax Lake | Gila boraxobius | Entire | 1 | E |
| Chub, Catlow tui | Gila bicolor ssp. | Catlow | 1 | Not Listed |
| Chub, Chihuahua | Gila nigrescens | Entire | 2 | T |
| Chub, Cow Head tui | Gila bicolor vaccaceps | entire | 8 | Not Listed |
| Chub, Dixie Valley tui | Gila bicolor ssp. | Dixie Valley | 1 | Not Listed |
| Chub, Fish Creek Springs tui | Gila bicolor euchila | Entire | 1 | Not Listed |
| Chub, Fish Lake Valley tui | Gila bicolor ssp. | Fish Lake | 1 | Not Listed |
| Chub, flame | Hemitremia flammea | Entire | 4 | Not Listed |
| Chub, flathead | Platygobio gracilis | Entire | 3 | Not Listed |
| Chub, Gila | Gila intermedia | Entire | 2 | E |
| Chub, headwater | Gila nigra | Entire | 2 | C |
| Chub, High Rock Springs tui | Gila bicolor ssp. | High Rock | 1 | Not Listed |
| Chub, Hot Creek Valley tui | Gila bicolor ssp. | Entire | 1 | Not Listed |
| Chub, humpback | Gila cypha | entire | 6 | E |
| Chub, Hutton tui | Gila bicolor ssp. | Hutton | 1 | T |
| Chub, Independence Valley tui | Gila bicolor isolata | Entire | 1 | Not Listed |
| Chub, least | Iotichthys phlegethontis | Entire | 6 | C |
| Chub, leatherside | Gila copei | Entire | 6 | Not Listed |
| Chub, lined | Hybopsis lineapunctata | Entire | 4 | Not Listed |
| Chub, Mohave tui | Gila bicolor mohavensis | Entire | 8 | E |
| Chub, Newark Valley tui | Gila bicolor newarkensis | Entire | 1 | Not Listed |
| Chub, Northern leatherside | Lepidomeda copei | Entire | 6 | Not Listed |
| Chub, Oregon | Oregonichthys crameri | Entire | 1 | T |
| Chub, Pahranagat roundtail | Gila robusta jordani | Entire | 8 | E |
| Chub, Pleasant Valley tui | Gila bicolor ssp. | Pleasant Valley | 1 | Not Listed |
| Chub, Railroad Valley tui | Gila bicolor ssp. | Railroad Valley | 1 | UR |
| Chub, roundtail | Gila robusta | Lower Colorado River Basin DPS | 2 | C |
| Chub, Sandhills | Semotilus lumbee | Entire | 4 | Not Listed |
| Chub, Sheldon tui | Gila bicolor eurysoma | Entire | 1 | Not Listed |
| Chub, sicklefin | Macrhybopsis meeki | Entire | 6 | Not Listed |
| Chub, slender | Erimystax cahni | Entire | 4 | T |
| Chub, slender | Erimystax cahni | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(s)(1)(i)) | 4 | EXPN |
| Chub, Sonora | Gila ditaenia | Entire | 2 | T |
| Chub, spotfin | Erimonax monachus | Entire | 4 | T |
| Chub, spotfin | Erimonax monachus | Shoal Creek | 4 | EXPN |
| Chub, spotfin | Erimonax monachus | Tellico River, between the backwaters of the Tellico Reservoir and the Tellico Ranger Station, in Monroe County, Tennessee | 4 | EXPN |
| Chub, spotfin | Erimonax monachus | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(m)(1)(iii)) | 4 | EXPN |
| Chub, sturgeon | Macrhybopsis gelida | Entire | 6 | Not Listed |
| Chub, Summer Basin tui | Gila bicolor ssp. | Summer Basin | 1 | Not Listed |
| Chub, Thicktail | Gila crassicauda | Entire | 1 | Not Listed |
| Chub, Umpqua Oregon | Oregonichthys kalawatseti | Entire | 1 | Not Listed |
| Chub, Virgin River | Gila seminuda (=robusta) | Entire | 6 | E |
| Chub, XL Spring tui | Gila bicolor oregonensis | Entire | 1 | Not Listed |
| Chub, Yaqui | Gila purpurea | Entire | 2 | E |
| Chuckwalla | Sauromalus obesus | Entire | 1 | Not Listed |
| Chuckwalla, San Esteban Island | Sauromalus varius | Entire | Foreign | E |
| Chumbo, Higo | Harrisia portoricensis | 4 | T | |
| Chupacallos | Pleodendron macranthum | 4 | E | |
| Cicek (minnow) | Acanthorutilus handlirschi | Entire | Foreign | E |
| Cinclodes, royal | Cinclodes aricomae | Entire | 9 | PE |
| Cinquefoil, Ballona | Potentilla multijuga | 1 | Not Listed | |
| cinquefoil, cliff | Potentilla rimicola | 1 | Not Listed | |
| Cinquefoil, Front Range | Potentilla effusa rupincola | 6 | Not Listed | |
| Cinquefoil, Kingston Mountains | Ivesia patellifera | 1 | Not Listed | |
| Cinquefoil Macoun's | Potentilla macounii | 6 | Not Listed | |
| Cinquefoil, Robbins' | Potentilla robbinsiana | 5 | DM | |
| Cinquefoil, Soldier Meadows | Potentilla basaltica | 8 | C | |
| Cinquuefoil, Ramona | Horkelia truncata | 1 | Not Listed | |
| Cirsium, sp. nov. ined. | Cirsium sp. | R6 | 6 | Not Listed |
| Cisco, blackfin | Coregonus nigripinnis nigripinnis | Entire | 3 | Not Listed |
| Cisco Bonneville | Prosopium gemmifer | Entire | 6 | Not Listed |
| Cisco, deepwater | Coregonus johannae | Entire | 3 | Not Listed |
| Cisco, longjaw | Coregonus alpenae | Entire | 3 | D3A |
| Cisco, shortjaw | Coregonus zenithicus | Entire | 3 | Not Listed |
| Cisco, shortnose | Coregonus reighardi | Entire | 3 | Not Listed |
| Civet, Malabar large-spotted | Viverra civettina (=megaspila c.) | Entire | Foreign | E |
| Cladonia, Florida perforate | Cladonia perforata | 4 | E | |
| Clam shrimp, American | Limnadia lenticularis | Entire | 5 | Not Listed |
| Clam shrimp, Connecticut | Eulimnadia stoningtonensis | Entire | 5 | Not Listed |
| Clam shrimp, Faxon's | Eulimnadia agassizii | Entire | 5 | Not Listed |
| Clarkia, arid northern | Clarkia borealis arida | 1 | Not Listed | |
| Clarkia, beaked | Clarkia rostrata | 1 | Not Listed | |
| Clarkia, Caliente | Clarkia temblorensis calientensis | 1 | Not Listed | |
| Clarkia, East Bay | Clarkia concinna automixa | 1 | Not Listed | |
| Clarkia, Enterprise | Clarkia mosquinii xerophila | 1 | Not Listed | |
| Clarkia, Mariposa | Clarkia biloba australis | 1 | Not Listed | |
| Clarkia, Merced | Clarkia lingulata | 1 | Not Listed | |
| Clarkia, Mosquin's | Clarkia mosquinii mosquinii | 1 | Not Listed | |
| Clarkia, Pismo | Clarkia speciosa ssp. immaculata | 8 | E | |
| Clarkia, Presidio | Clarkia franciscana | 8 | E | |
| Clarkia, Small's southern | Clarkia australis | 1 | Not Listed | |
| Clarkia, Springville | Clarkia springvillensis | 8 | T | |
| Clarkia, Tomales | Clarkia concinna raichei | 1 | Not Listed | |
| Clarkia, [unnamed] | Clarkia amoena pacifica | 1 | Not Listed | |
| Clarkia, [unnamed] | Clarkia amoena whitneyi | 1 | Not Listed | |
| Clarkia, Vine Hill | Clarkia imbricata | 8 | E | |
| clay-cress, Hammitt's | sibaropsis hammittii | 6 | Not Listed | |
| Claytonia, fell fields | Claytonia megarhiza bellidiflora | 1 | Not Listed | |
| Click beetle, ambiguous eopenthes | Eopenthes ambiguus | Entire | 1 | Not Listed |
| Click beetle, arduous eopenthes | Eopenthes arduus | Entire | 1 | Not Listed |
| Click beetle, cognatus eopenthes | Eopenthes cognatus | Entire | 1 | Not Listed |
| Click beetle, common eopenthes | Eopenthes plebeius | Entire | 1 | Not Listed |
| Click beetle, death eopenthes | Eopenthes funebris | Entire | 1 | Not Listed |
| Click beetle, deceptive eopenthes | Eopenthes deceptor | Entire | 1 | Not Listed |
| Click beetle, germanus eopenthes | Eopenthes germanus | Entire | 1 | Not Listed |
| Click beetle, golden eopenthes | Eopenthes auratus | Entire | 1 | Not Listed |
| Click beetle, Hatch's | Eanus hatchi | Entire | 1 | Not Listed |
| Click beetle, hidden eopenthes | Eopenthes celatus | Entire | 1 | Not Listed |
| Click beetle, Kauai eopenthes | Eopenthes kauaiensis | Entire | 1 | Not Listed |
| Click beetle, muticus eopenthes | Eopenthes muticus | Entire | 1 | Not Listed |
| Click beetle, Necker itodacnus | Itodacnus novicornis | Entire | 1 | Not Listed |
| Click beetle, pallipes eopenthes | Eopenthes pallipes | Entire | 1 | Not Listed |
| Click beetle, politus eopenthes | Eopenthes politus | Entire | 1 | Not Listed |
| Click beetle, strange itodacnus | Itodacnus paradoxus | Entire | 1 | Not Listed |
| Click beetle, tarsalis eopenthes | Eopenthes tarsalis | Entire | 1 | Not Listed |
| Click beetle, tinged eopenthes | Eopenthes tinctus | Entire | 1 | Not Listed |
| Click beetle, unicolored eopenthes | Eopenthes unicolor | Entire | 1 | Not Listed |
| Click beetle, weak eopenthes | Eopenthes debilis | Entire | 1 | Not Listed |
| Cliff-rose, Arizona | Purshia (=Cowania) subintegra | 2 | E | |
| Clover, Beatley's | Trifolium andersonii beatleyae | 1 | Not Listed | |
| Clover, DeDecker's | Trifolium dedeckerae | 1 | Not Listed | |
| Clover, frisco | Trifolium friscanum | 6 | C | |
| clover, Humboldt Bay Owl's | Castilleja ambigua humboldtiensis | 1 | Not Listed | |
| Clover, Kate's-mountain | Trifolium virginicum | 5 | Not Listed | |
| Clover, Lemmon's | Trifolium lemmonii | 1 | Not Listed | |
| Clover, Monterey | Trifolium trichocalyx | 8 | E | |
| Clover, Owyhee | Trifolium owyheense | 1 | Not Listed | |
| Clover, Pacific Grove | Trifolium polyodon | 1 | Not Listed | |
| Clover, parasol | Trifolium bolanderi | 1 | Not Listed | |
| Clover, running buffalo | Trifolium stoloniferum | 3 | E | |
| Clover, showy Indian | Trifolium amoenum | 8 | E | |
| Clover, Thompson's | Trifolium thompsonii | 1 | Not Listed | |
| Clover, [unnamed] | Trifolium barnebyi | 6 | Not Listed | |
| Clover, [unnamed] | Trifolium calcaricum | 5 | Not Listed | |
| Clover, [unnamed] | Trifolium leibergii | 1 | Not Listed | |
| Clover, [unnamed] | Trifolium macilentum rollinsii | 1 | Not Listed | |
| Clover, [unnamed] | Trifolium neurophyllum | 2 | Not Listed | |
| Clover, [unnamed] | Trifolium plumosum amplifolium | 1 | Not Listed | |
| Clover, [unnamed] | Trifolium plumosum plumosum | 1 | Not Listed | |
| Clubmoss, [unnamed] | Lycopodium portoricense | 4 | Not Listed | |
| Clubshell | Pleurobema clava | Entire Range; Except where listed as Experimental Populations | 5 | E |
| Clubshell | Pleurobema clava | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Clubshell, Alabama | Pleurobema troschelianum | Entire | 4 | UR |
| Clubshell, black | Pleurobema curtum | Entire | 4 | E |
| Clubshell, ovate | Pleurobema perovatum | Entire | 4 | E |
| Clubshell, painted | Pleurobema chattanoogaense | Entire | 4 | UR |
| Clubshell, southern | Pleurobema decisum | Entire | 4 | E |
| Clubshell, Tennessee | Pleurobema oviforme | Entire | 4 | Not Listed |
| Clubtail, bronze | Stylurus townesi | Entire | 4 | Not Listed |
| Clubtail, Cherokee | Gomphus consanguis | Entire | 4 | Not Listed |
| Clubtail, elusive | Gomphus notatus | Entire | 3 | Not Listed |
| Clubtail, Lynn's | Gomphus lynnae | Entire | 1 | Not Listed |
| Clubtail, sandhills | Gomphus parvidens carolinus | Entire | 4 | Not Listed |
| Clubtail, Septima's | Gomphus septima | Entire | 4 | Not Listed |
| Clubtail, Tennessee | Gomphus sandrius | Entire | 4 | Not Listed |
| Clubtail, variegated | Progomphus bellei | Entire | 4 | Not Listed |
| Clubtail, Westfall's | Gomphus westfalli | Entire | 4 | Not Listed |
| coachwhip, Red | masticophis flagellum ssp. piceus | Entire | 6 | Not Listed |
| Cobana negra | Stahlia monosperma | 4 | T | |
| Cochito | Phocoena sinus | Entire | Foreign | E |
| Cockatoo, Philippine | Cacatua haematuropygia | Entire | Foreign | PE |
| Cockatoo, salmon-crested | Cacatua moluccensis | Entire | 9 | T |
| Cockatoo, white | Cacatua alba | Entire | Foreign | PT |
| Cockatoo, yellow-crested | Cacatua sulphurea | Entire | Foreign | PE |
| Coenonycha, San Clemente Island | Coenonycha clementina | Entire | 1 | Not Listed |
| Coil, shaggy | Helicodiscus diadema | Entire | 5 | Not Listed |
| Coil, toothy | Helicodiscus hexodon | Entire | 4 | Not Listed |
| collinsia, San Francisco | collinsia multicolor | 8 | Not Listed | |
| Collomia, bristle-flowered | Collomia macrocalyx | 1 | Not Listed | |
| Collomia, Crater Lake | Collomia mazama | 1 | Not Listed | |
| Collomia, talus | Collomia debilis larsenii | 1 | Not Listed | |
| Colubrina, Las Animas | Colubrina californica | 2 | Not Listed | |
| Columbine, Canadian, | Aquilegia canadensis australis | 4 | Not Listed | |
| Columbine Grahams | Aquilegia grahamii | 6 | NS | |
| Columbine Graham's | Aquilegia grahamii | 6 | Not Listed | |
| Columbine, Hinckley's | Aquilegia chrysantha hinckleyana | 2 | Not Listed | |
| Columbine, Jones' | Aquilegia jonesii | 6 | Not Listed | |
| Columbine, Laramie | Aquilegia laramiensis | 6 | Not Listed | |
| Columbine, long spur | Aquilegia longissima | 2 | Not Listed | |
| Columbine, Mancos | Aquilegia micrantha mancosana | 6 | Not Listed | |
| Columbine, [unnamed] | Aquilegia chrysantha chaplinei | 2 | Not Listed | |
| Columbine, [unnamed] | Aquilegia chrysantha rydbergii | 2 | Not Listed | |
| Combleaf | Polyctenium williamsiae | 1 | Not Listed | |
| Combshell, Cumberlandian | Epioblasma brevidens | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Combshell, Cumberlandian | Epioblasma brevidens | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Combshell, Cumberlandian | Epioblasma brevidens | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Combshell, round | Epioblasma personata | Entire | 4 | Not Listed |
| Combshell, southern | Epioblasma penita | Entire | 4 | E |
| Combshell, upland | Epioblasma metastriata | Entire | 4 | E |
| Condor, Andean | Vultur gryphus | Entire | Foreign | E |
| Condor, California | Gymnogyps californianus | U.S.A. only, except where listed as an experimental population below | 8 | E |
| Condor, California | Gymnogyps californianus | U.S.A. (specific portions of Arizona, Nevada, and Utah) | 1 | EXPN |
| Coneflower, bog | Rudbeckia scabrifolia | 2 | Not Listed | |
| Coneflower, smooth | Echinacea laevigata | 4 | E | |
| Coneflower, Tennessee purple | Echinacea tennesseensis | 4 | DM | |
| Coneflower, yellow | Rudbeckia nitida nitida | 4 | Not Listed | |
| Coontie, Florida | Zamia integrifolia pigmaea | 4 | Not Listed | |
| Coot, Caribbean | Fulica caribaea | Puerto Rican | 4 | Not Listed |
| Cooter, Suwanee | Pseudemys concinna suwaniensis | Entire | 4 | Not Listed |
| Coot, Hawaiian | Fulica americana alai | Entire | 1 | E |
| Copepod | Acanthocyclops columbiensis | Entire | NA | Not Listed |
| Copper, Clayton's | Lycaena dorcas claytoni | Entire | 5 | Not Listed |
| Copper, Hermes | Lycaena hermes | Entire | 8 | C |
| Copper, White Mountains | Lycaena rubicus ssp. | Entire | 1 | Not Listed |
| Coqui, golden | Eleutherodactylus jasperi | Entire | 4 | T |
| Coqui, mottled | Eleutherodactylus eneidae | Entire | 4 | Not Listed |
| Coqui, web-footed | Eleutherodactylus karlschmidti | Entire | 4 | Not Listed |
| Coral, elkhorn | Acropora palmata | Entire | NMFS | T |
| Coral-root, Chisos | Hexalectris revoluta | 2 | Not Listed | |
| Coral-root, Glass Mountain | Hexalectris nitida | 2 | Not Listed | |
| Coral, staghorn | Acropora cervicornis | Entire | NMFS | T |
| Coreopsis, Mt. Hamilton | Coreopsis hamiltonii | 1 | Not Listed | |
| Corkwood | Leitneria floridana | 4 | Not Listed | |
| cormorant, Double-crested | phalacrocorax auritus | Entire | 7 | Not Listed |
| Cornsalad, Edwards' Plateau | Valerianella texana | 2 | Not Listed | |
| Cory cactus, bunched | Coryphantha ramillosa | 2 | T | |
| Cory cactus, Chaffey's | Coryphantha chaffeyi | 2 | Not Listed | |
| Cory cactus, Duncan's | Coryphantha duncanii | 2 | Not Listed | |
| Cory cactus, Hester's | Coryphantha hesteri | 2 | Not Listed | |
| Cory cactus, Nickel's | Coryphantha sulcata nickelsiae | 2 | Not Listed | |
| Cory cactus, [unnamed] | Coryphantha missouriensis marstonii | 2 | Not Listed | |
| Cory cactus, [unnamed] | Coryphantha scheeri uncinata | 2 | Not Listed | |
| Cory cactus, [unnamed] | Coryphantha vivipara buoflama | 2 | Not Listed | |
| Cory cactus, white column | Coryphantha albicolumnaria | 2 | Not Listed | |
| Corydalis, Sierra | Corydalis caseana caseana | 1 | Not Listed | |
| Cotinga, banded | Cotinga maculata | Entire | Foreign | E |
| Cotinga, grey-winged | Tijuca condita | Entire | NA | Not Listed |
| Cotinga, white-winged | Xipholena atropurpurea | Entire | Foreign | E |
| Cotorrilla | Heliotropium guanicense | 4 | Not Listed | |
| Cotton, Hawaiian | Gossypium tomentosum | 1 | Not Listed | |
| Cotton rat, Colorado River | Sigmodon arizonae plenus | Entire | 1 | Not Listed |
| Cotton rat, Hot Springs | Sigmodon fulviventer goldmani | Entire | 2 | Not Listed |
| Cotton rat, insular hispid | Sigmodon hispidus insulicola | Entire | 4 | Not Listed |
| Cotton rat, lower Keys | Sigmodon hispidus exsputus | Entire | 4 | Not Listed |
| Cotton rat, Micco hispid | Sigmodon hispidus littoralis | Entire | 4 | Not Listed |
| Cotton rat, Yavapai Arizona | Sigmodon arizonae jacksoni | Entire | 2 | Not Listed |
| Cotton rat, yellow-nosed | Sigmodon ochrognathus | Entire | 2 | Not Listed |
| Cotton rat, Yuma hispid | Sigmodon hispidus eremicus | Entire | 2 | Not Listed |
| Cottonwood, Goat Canyon | Populus hinckleyana | 2 | Not Listed | |
| Courser, Jerdon's | Rhinoptilus bitorquatus | Entire | 9 | E |
| Covert, Clingman | Mesodon clingmanicus | Entire | 4 | Not Listed |
| Covert, engraved | Mesodon orestes | Entire | 4 | Not Listed |
| Coyot, bush, Hoover's | Baccharis plummerae glabrata | 1 | Not Listed | |
| coyote | canis latrans | Entire | 7 | Not Listed |
| Coyote-thistle, Delta | Eryngium racemosum | 1 | Not Listed | |
| Coyote-thistle, Mathias' | Eryngium mathiasiae | 1 | Not Listed | |
| Coyote-thistle, Tuolumne | Eryngium pinnatisectum | 1 | Not Listed | |
| Coyote-thistle, [unnamed] | Eryngium petiolatum | 1 | Not Listed | |
| Crabgrass, Florida pineland | Digitaria pauciflora | 4 | C | |
| Crake, spotless | Porzana tabuensis | American Samoa pop | 1 | C |
| Crane, black-necked | Grus nigricollis | Entire | Foreign | E |
| Crane, Cuba sandhill | Grus canadensis nesiotes | Entire | Foreign | E |
| Crane, Greater Sandhill | Grus canadensis tabida | Entire | 1 | Not Listed |
| crane, Greater sandhill | guiraca caerulea | Entire | 7 | Not Listed |
| Crane, hooded | Grus monacha | Entire | Foreign | E |
| Crane, Japanese | Grus japonensis | Entire | Foreign | E |
| Crane, Mississippi sandhill | Grus canadensis pulla | Entire | 4 | E |
| Crane, Siberian white | Grus leucogeranus | Entire | Foreign | E |
| Crane, white-naped | Grus vipio | Entire | Foreign | E |
| Crane, whooping | Grus americana | Entire, except where listed as an experimental population | 2 | E |
| Crane, whooping | Grus americana | U.S.A.(AL, AR, GA, IL, IN, IA, KY, LA, MI, MN, MS, MO, NC, OH, SC, TN, VA, WI, WV) | 2 | EXPN |
| Crane, whooping | Grus americana | U.S.A. (CO, ID, FL, NM, UT, and the western half of Wyoming) | 4 | EXPN |
| Crane, whooping | Grus americana | U.S.A (Southwestern Louisiana) | 4 | EXPN |
| Crawling water beetle, disjunct | Haliplus nitens | Entire | 2 | Not Listed |
| Crayfish, Albermarle | Procambarus medialis | Entire | 4 | Not Listed |
| Crayfish, bearded red | Procambarus pogum | Entire | 4 | Not Listed |
| Crayfish, Big South Fork | Cambarus bouchardi | Entire | 4 | Not Listed |
| Crayfish, Black Creek | Procambarus pictus | Entire | 4 | Not Listed |
| Crayfish, Blood River | Orconectes burri | Entire | 4 | Not Listed |
| Crayfish, Camp Shelby burrowing | Fallicambarus gordoni | Entire | 4 | UR |
| Crayfish, Carrollton | Procambarus connus | Entire | 4 | Not Listed |
| Crayfish, cave | Cambarus aculabrum | Entire | 4 | E |
| Crayfish, cave | Cambarus zophonastes | Entire | 4 | E |
| Crayfish, Chickamauga | Cambarus extraneus | Entire | 4 | Not Listed |
| Crayfish, Chowanoke | Orconectes virginiensis | Entire | 4 | Not Listed |
| Crayfish, Conchas | Orconectes deanae | Entire | 2 | Not Listed |
| Crayfish, Croatan | Procambarus plumimanus | Entire | 4 | Not Listed |
| Crayfish, Edisto | Procambarus echinatus | Entire | 4 | Not Listed |
| Crayfish, French Broad | Cambarus reburrus | Entire | 4 | Not Listed |
| Crayfish, Greensboro burrowing | Cambarus catagius | Entire | 4 | Not Listed |
| Crayfish, Hiwassee | Cambarus hiwassensis | Entire | 4 | Not Listed |
| Crayfish, Indiana | Orconectes indianensis | Entire | 3 | Not Listed |
| Crayfish, Jackson Prairie | Procambarus barbiger | Entire | 4 | Not Listed |
| Crayfish, Little River | Cambarus spicatus | Entire | 4 | Not Listed |
| Crayfish, Little Tennessee | Cambarus georgiae | Entire | 4 | Not Listed |
| Crayfish, Louisville | Orconectes jeffersoni | Entire | 4 | Not Listed |
| Crayfish, Mississippi flatwoods | Procambarus cometes | Entire | 4 | Not Listed |
| Crayfish, Nashville | Orconectes shoupi | Entire | 4 | E |
| Crayfish, New River riffle | Cambarus chasmodactylus | Entire | 5 | Not Listed |
| Crayfish, Obey | Cambarus obeyensis | Entire | 4 | Not Listed |
| Crayfish, Oktibbeha rivulet | Hobbseus orconectoides | Entire | 4 | Not Listed |
| Crayfish, Palm Springs Cave | Procambarus acherontis | Entire | 4 | Not Listed |
| Crayfish, Panama City | Procambarus econfinae | Entire | 4 | Not Listed |
| Crayfish, Parrish | Cambarus parrishi | Entire | 4 | Not Listed |
| Crayfish, Pee Dee lotic | Procambarus lepidodactylus | Entire | 4 | Not Listed |
| Crayfish, Saluda | Distocambarus youngineri | Entire | 4 | Not Listed |
| Crayfish, Shasta | Pacifastacus fortis | Entire | 8 | E |
| Crayfish, Shelta Cave | Orconectes sp. | Entire | 4 | Not Listed |
| Crayfish, Shutispear | Procambarus lylei | Entire | 4 | Not Listed |
| crayfish, Southern cave | orconectes australis ssp. australis | Entire | 4 | Not Listed |
| Crayfish, spinytail | Procambarus fitzpatricki | Entire | 4 | Not Listed |
| crayfish, Tallapoosa River | Cambarus englishi | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Cambarus batchi | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Cambarus miltus | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Cambarus tartarus | Entire | 2 | Not Listed |
| Crayfish, [unnamed] | Cambarus veteranus | Entire | 5 | Not Listed |
| Crayfish, [unnamed] | Fallicambarus burrisi | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Fallicambarus danielae | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Fallicambarus gilpini | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Fallicambarus harpi | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Fallicambarus jeanae | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Fallicambarus petilicarpus | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Orconectes williamsi | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Procambarus ferrugineus | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Procambarus lagniappe | Entire | 4 | Not Listed |
| Crayfish, [unnamed] | Procambarus liberorum | Entire | 4 | Not Listed |
| Cream cups, Santa Barbara Island | Platystemon californicus ciliatus | 1 | Not Listed | |
| Creekshell, Carolina | Villosa vaughaniana | Entire | 4 | Not Listed |
| Creekshell, Kentucky | Villosa ortmanni | Entire | 4 | Not Listed |
| Creekshell, Ouachita | Villosa arkansasensis | Entire | 4 | Not Listed |
| creeper, Brown | certhia americana | Entire | 7 | Not Listed |
| Creeper, Hawaii | Oreomystis mana | Entire | 1 | E |
| Creeper, Molokai | Paroreomyza flammea | Entire | 1 | E |
| Creeper, Oahu | Paroreomyza maculata | Entire | 1 | E |
| Crescentspot, Steptoe Valley | Phyciodes cocyta arenacolor | Entire | 8 | UR |
| Crescent, tawny | Phyciodes batesi | Entire | 3 | Not Listed |
| Cress, Tahoe yellow | Rorippa subumbellata | 8 | C | |
| Cricket, Arizona giant sand treader | Daihinibaenetes arizonensis | Entire | 2 | Not Listed |
| Cricket, Berkeley Ground | Neonemobius eurynotus | Entire | NA | Not Listed |
| Cricket, Coachella giant sand treader | Macrobaenetes valgum | Entire | 1 | Not Listed |
| Cricket, Howarth's cave | Caconemobius howarthi | Entire | 1 | Not Listed |
| Cricket, Jacalitos Jerusalem | Stenopelmatus nigrocapitatus | Entire | NA | Not Listed |
| Cricket, Kauai thinfooted bush | Thaumatogryllus variegatus | Entire | 1 | Not Listed |
| Cricket, Kaumana Cave | Caconemobius varius | Entire | 1 | Not Listed |
| Cricket, Kelso giant sand treader | Macrobaenetes kelsoensis | Entire | 1 | Not Listed |
| Cricket, Keys scaly | Cycloptilum irregularis | Entire | 4 | Not Listed |
| Cricket, laricis tree | Oecanthus laricis | Entire | 3 | Not Listed |
| Cricket, Oahu deceptor bush | Leptogryllus deceptor | Entire | 1 | Not Listed |
| Cricket, Samwell Cave | Pristoceuthophilus sp. | Entire | 1 | Not Listed |
| Cricket, Schauinsland's bush | Caconemobius schauinslandi | Entire | 1 | Not Listed |
| Cricket, Volcanoes cave | Thaumatogryllus cavicola | Entire | 1 | Not Listed |
| Crocodile, African dwarf | Osteolaemus tetraspis tetraspis | Entire | Foreign | E |
| Crocodile, African slender-snouted | Crocodylus cataphractus | Entire | Foreign | E |
| Crocodile, American | Crocodylus acutus | Entire, except U.S.A. (FL) | Foreign | E |
| Crocodile, American | Crocodylus acutus | FL pop. | 4 | T |
| Crocodile, Ceylon mugger | Crocodylus palustris kimbula | Entire | Foreign | E |
| Crocodile, Congo dwarf | Osteolaemus tetraspis osborni | Entire | Foreign | E |
| Crocodile, Cuban | Crocodylus rhombifer | Entire | Foreign | E |
| Crocodile, Morelet's | Crocodylus moreletii | Entire | Foreign | E |
| Crocodile, mugger | Crocodylus palustris palustris | Entire | Foreign | E |
| Crocodile, Nile | Crocodylus niloticus | Entire | Foreign | T |
| Crocodile, Orinoco | Crocodylus intermedius | Entire | Foreign | E |
| Crocodile, Philippine | Crocodylus novaeguineae mindorensis | Entire | Foreign | E |
| Crocodile, saltwater | Crocodylus porosus | Australia | Foreign | T |
| Crocodile, saltwater | Crocodylus porosus | Entire, except Papua New Guinea and Australia | Foreign | E |
| Crocodile, Siamese | Crocodylus siamensis | Entire | Foreign | E |
| Croomia, [unnamed] | Croomia pauciflora | 4 | Not Listed | |
| crossbill, Red | Loxia curvirostra | Entire | 4 | Not Listed |
| Crossosoma, Catalina | Crossosoma californicum | 1 | Not Listed | |
| Croton, Alabama | Croton alabamensis alabamensis | 4 | Not Listed | |
| Croton, Wiggin's | Croton wigginsii | 1 | Not Listed | |
| Crowfoot, Kerr | Ranunculus fascicularis cuneiformis | 2 | Not Listed | |
| Crow, Hawaiian (='alala) | Corvus hawaiiensis | Entire | 1 | E |
| Crow, Mariana (=aga) | Corvus kubaryi | Entire | 1 | E |
| Crownbeard, big-leaved | Verbesina dissita | 8 | T | |
| Crownbeard, Chapman's | Verbesina chapmannii | 4 | Not Listed | |
| Crownscale, San Jacinto Valley | Atriplex coronata var. notatior | 8 | E | |
| Crow, white-necked | Corvus leucognaphalus | Entire | 4 | E |
| Cryptantha, Alpine County | Cryptantha crymophila | 1 | Not Listed | |
| Cryptantha, Gander's | Cryptantha ganderi | 1 | Not Listed | |
| Cryptantha, Hoffmann's | Cryptantha hoffmannii | 1 | Not Listed | |
| Cryptantha, New York Mountains | Cryptantha tumulosa | 1 | Not Listed | |
| Cryptantha, Schoolcraft's | Cryptantha schoolcraftii | 1 | Not Listed | |
| Cryptantha, silky | Cryptantha crinita | 1 | Not Listed | |
| Cryptantha, Trask's | Cryptantha traskiae | 1 | Not Listed | |
| Cryptantha, Welsh's | Cryptantha welshii | 1 | Not Listed | |
| Cuckoo-shrike, Mauritius | Coquus typicus | Entire | Foreign | E |
| Cuckoo-shrike, Reunion | Coquus newtoni | Entire | Foreign | E |
| Cuckoo, southeastern rufous-vented ground | Neomorphus geoffroyi dulcis | Entire | 9 | E |
| Cuckoo, yellow-billed | Coccyzus americanus | Western U.S. DPS | 8 | C |
| Cuero de sapo | Maytenus elongata | 4 | Not Listed | |
| Cuero de sapo | Maytenus ponceana | 4 | Not Listed | |
| Cui-ui | Chasmistes cujus | Entire | 8 | E |
| Curassow, blue-billed | Crax alberti | Entire | 9 | PE |
| Curassow, razor-billed | Mitu mitu mitu | Entire | Foreign | E |
| Curassow, red-billed | Crax blumenbachii | Entire | Foreign | E |
| Curassow, Southern-helmeted | Pauxi unicornis | Entire | Foreign | UR |
| Curassow, Trinidad white-headed | Pipile pipile pipile | Entire | Foreign | E |
| Curlew, bristle-thighed | Numenius tahitiensis | Entire | 7 | Not Listed |
| Curlew, Eskimo | Numenius borealis | Entire | 7 | E |
| Curlew, long-billed | Numenius americanus | Entire | 6 | Not Listed |
| Curlew, slender-billed | Numenius tenuirostris | Entire | 9 | E |
| Currant, Moreno | Ribes canthariforme | 1 | Not Listed | |
| Currawong, Lord Howe Island (pied) | Strepera graculina crissalis | Entire | Foreign | UR |
| Cyanea, Molokai | Cyanea solenocalyx | 1 | Not Listed | |
| Cycladenia, Jones | Cycladenia jonesii (=humilis) | 6 | T | |
| Cymopterus, desert | Cymopterus deserticola | 1 | Not Listed | |
| Cypress, Cuyamaca | Cupressus stephensonii | 1 | Not Listed | |
| Cypress, Gowen | Cupressus goveniana ssp. goveniana | 8 | T | |
| Cypress, Mendocino | Cupressus goveniana pigmaea | 1 | Not Listed | |
| Cypress, Monterey | Cupressus macrocarpa | 1 | Not Listed | |
| Cypress, Piute | Cupressus nevadensis | 1 | Not Listed | |
| Cypress, Santa Cruz | Cupressus abramsiana | 8 | E | |
| Cypress, Tecate | Cupressus forbesii | 1 | Not Listed | |
| Dace, Amargosa Canyon speckled | Rhinichthys osculus ssp. | Amargosa Canyon | 1 | Not Listed |
| Dace, Ash Meadows speckled | Rhinichthys osculus nevadensis | Entire | 8 | E |
| Dace, Benton Valley speckled | Rhinichthys osculus ssp. | Benton Valley | 1 | Not Listed |
| Dace, blackside | Phoxinus cumberlandensis | Entire | 4 | T |
| Dace, Clover Valley speckled | Rhinichthys osculus oligoporus | Entire | 8 | E |
| Dace, desert | Eremichthys acros | Entire | 8 | T |
| Dace, Diamond Valley speckled | Rhinichthys osculus ssp. | Diamond Valley | 1 | Not Listed |
| Dace, Foskett speckled | Rhinichthys osculus ssp. | Foskett | 1 | T |
| Dace, Grass Valley speckled | Rhinichthys osculus reliquus | Entire | 1 | Not Listed |
| Dace, Independence Valley speckled | Rhinichthys osculus lethoporus | Entire | 8 | E |
| Dace, Kendall Warm Springs | Rhinichthys osculus thermalis | Entire | 6 | E |
| Dace, Las Vegas | Rhinichthys deaconi | Entire | 1 | Not Listed |
| dace, Laurel | Phoxinus saylori | Entire | 4 | E |
| Dace, Little Lake speckled | Rhinichthys osculus ssp. | Little Lake | 1 | Not Listed |
| Dace, longfin | Agosia chrysogaster | Entire | 2 | Not Listed |
| Dace, Long Valley speckled | Rhinichthys osculus ssp. | Long Valley | 1 | Not Listed |
| Dace, Meadow Valley Wash speckled | Rhinichthys osculus ssp. | Meadow Valley | 1 | UR |
| Dace, Millicoma | Rhinichthys cataractae ssp. | Entire | 1 | Not Listed |
| Dace, Moapa | Moapa coriacea | Entire | 8 | E |
| Dace, Moapa speckled | Rhinichthys osculus moapae | Entire | 1 | UR |
| Dace, Monitor Valley speckled | Rhinichthys osculus ssp. | Monitor Valley | 1 | Not Listed |
| Dace, Oasis Valley speckled | Rhinichthys osculus ssp. | Oasis Valley | 1 | UR |
| Dace, Owens speckled | Rhinichthys osculus ssp. | Owens | 1 | Not Listed |
| Dace, Pahranagat speckled | Rhinichthys osculus velifer | Entire | 1 | UR |
| Dace, relict | Relictus solitarius | Entire | 1 | Not Listed |
| Dace, Santa Ana speckled | Rhinichthys osculus ssp. | Santa Ana | 1 | Not Listed |
| Dace, speckled | Rhinichthys osculus ssp. | Gila & Bill Williams | 2 | Not Listed |
| Dace, White River speckled | Rhinichthys osculus ssp. | White River | 1 | UR |
| Dagger moth, albarufan | Acronicta albarufa | Entire | 5 | Not Listed |
| Daisy, Abajo | Erigeron abajoensis | 6 | Not Listed | |
| Daisy, Apalachicola doll's | Boltonia apalachicolensis | 4 | Not Listed | |
| Daisy Awapa | Erigeron awapensis | 6 | Not Listed | |
| Daisy, basalt | Erigeron basalticus | 1 | Not Listed | |
| Daisy, cliff | Erigeron proselyticus | 6 | Not Listed | |
| Daisy, Cronquist | Erigeron cronquistii | 6 | Not Listed | |
| Daisy, depauperate | Erigeron mancus | 6 | Not Listed | |
| Daisy, Hall's | Erigeron aequifolius | 1 | Not Listed | |
| Daisy, Kachina | Erigeron kachinensis | 6 | Not Listed | |
| Daisy, Kern River | Erigeron multiceps | 1 | Not Listed | |
| Daisy, lakeside | Hymenoxys herbacea | 3 | T | |
| Daisy, Maguire | Erigeron maguirei | 6 | DM | |
| Daisy, Panamint | Enceliopsis covillei | 1 | Not Listed | |
| Daisy, Parish's | Erigeron parishii | 8 | T | |
| Daisy, seaside, Coulter's | Lasthenia glabrata coulteri | 1 | Not Listed | |
| Daisy, supple | Erigeron supplex | 1 | Not Listed | |
| Daisy, Trinity Alps | Erigeron flexuosus | 1 | Not Listed | |
| Daisy, Waldo | Erigeron bloomeri nudatus | 1 | Not Listed | |
| Daisy, Willamette | Erigeron decumbens var. decumbens | 1 | E | |
| Dalea, Cox's | Dalea bartonii | 2 | Not Listed | |
| Damselfly, adytum megalagrion | Megalagrion adytum | Entire | 1 | Not Listed |
| Damselfly, Balmorhea | Argia sp. | Balmorhea | 2 | Not Listed |
| Damselfly, Barrens bluet | Enallagma recurvatum | Entire | 5 | Not Listed |
| Damselfly, blackline Hawaiian | Megalagrion nigrohamatum nigrolineatum | Entire | 1 | PE |
| Damselfly, crimson Hawaiian | Megalagrion leptodemus | Entire | 1 | PE |
| Damselfly, fallax megalagrion | Megalagrion amaurodytum fallax | Entire | 1 | Not Listed |
| Damselfly, flying earwig Hawaiian | Megalagrion nesiotes | Entire | 1 | E |
| Damselfly, jugorum megalagrion | Megalagrion jugorum | Entire | 1 | Not Listed |
| Damselfly, Molokai megalagrion | Megalagrion molokaiense | Entire | 1 | Not Listed |
| Damselfly, nigrohamatum megalagrion | Megalagrion nigrohamatum nigrohamatum | Entire | 1 | Not Listed |
| Damselfly, Oahu megalagrion | Megalagrion oahuenses | Entire | 1 | Not Listed |
| Damselfly, oceanic Hawaiian | Megalagrion oceanicum | Entire | 1 | PE |
| Damselfly, orangeblack Hawaiian | Megalagrion xanthomelas | Entire | 1 | C |
| Damselfly, Pacific Hawaiian | Megalagrion pacificum | Entire | 1 | E |
| Damselfly, Pele megalagrion | Megalagrion amaurodytum peles | Entire | 1 | Not Listed |
| damselfly, Rota blue | ischnura | Entire | 6 | Not Listed |
| Damselfly, Sabino Canyon | Argia sp. | Sabino Canyon | 2 | Not Listed |
| Damselfly, San Francisco forktail | Ischnura gemina | Entire | 1 | Not Listed |
| Damselfly, Waianae megalagrion | Megalagrion amaurodytum waianaeanum | Entire | 1 | Not Listed |
| Dance fly, Hawaiian chersodromian | Chersodromia hawaiiensis | Entire | 1 | Not Listed |
| Dancing-lady, Coot Bay | Oncidium carthagenense | 4 | Not Listed | |
| Darter, Alabama channel | Percina sp. | AL channel | 4 | Not Listed |
| Darter, amber | Percina antesella | Entire | 4 | E |
| Darter, Arkansas | Etheostoma cragini | Entire | 6 | C |
| Darter, ashy | Etheostoma cinereum | Entire | 4 | Not Listed |
| darter, bandfin | Etheostoma zonistium | Entire | 4 | Not Listed |
| Darter, Barrens | Etheostoma forbesi | Entire | 4 | Not Listed |
| Darter, bayou | Etheostoma rubrum | Entire | 4 | T |
| Darter, bluemask (=jewel) | Etheostoma sp. | Entire | 4 | E |
| Darter, bluestripe | Percina cymatotaenia | Entire | 3 | Not Listed |
| Darter, boulder | Etheostoma wapiti | Entire | 4 | E |
| Darter, boulder | Etheostoma wapiti | Shoal Creek | 4 | EXPN |
| Darter, bronze | Percina palmaris | Entire | 4 | Not Listed |
| Darter, Carolina | Etheostoma collis | Entire | 4 | Not Listed |
| Darter, Cherokee | Etheostoma scotti | Entire | 4 | T |
| Darter, coldwater | Etheostoma ditrema | Entire | 4 | Not Listed |
| Darter, coppercheek | Etheostoma aquali | Entire | 4 | Not Listed |
| Darter, crown | Etheostoma corona | Entire | 4 | Not Listed |
| Darter, crystal | Crystallaria asprella | Entire | 4 | Not Listed |
| Darter, Cumberland | Etheostoma susanae | Entire | 4 | E |
| Darter, diamond | Crystallaria cincotta | Entire | 5 | C |
| Darter, duskytail | Etheostoma percnurum | Entire | 4 | E |
| Darter, duskytail | Etheostoma percnurum | Tellico River, between the backwaters of the Tellico Reservoir and the Tellico Ranger Station, in Monroe County, Tennessee | 4 | EXPN |
| Darter, duskytail | Etheostoma percnurum | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(q)(1)(ii)) | 4 | EXPN |
| Darter, eastern sand | Etheostoma pellucidum | Entire | 5 | Not Listed |
| Darter, egg-mimic | Etheostoma pseudovulatum | Entire | 4 | Not Listed |
| Darter, Etowah | Etheostoma etowahae | Entire | 4 | E |
| Darter, finescale saddled | Etheostoma osburni | Entire | 5 | Not Listed |
| Darter, fountain | Etheostoma fonticola | Entire | 2 | E |
| Darter, freckled | Percina lenticula | Entire | 4 | Not Listed |
| Darter, goldline | Percina aurolineata | Entire | 4 | T |
| Darter, greenthroat | Etheostoma lepidum | Entire | 2 | Not Listed |
| Darter, Halloween | Percina sp. | Halloween | 4 | Not Listed |
| Darter, Hiwassee | Etheostoma | Entire | 4 | Not Listed |
| Darter, holiday | Etheostoma brevirostrum | Entire | 4 | Not Listed |
| Darter, Kentucky arrow | Etheostoma sagitta ssp. spilotum | Entire | 4 | C |
| Darter, leopard | Percina pantherina | Entire | 2 | T |
| darter, lipstick | Etheostoma chuckwachatte | Entire | 4 | Not Listed |
| Darter, longhead | Percina macrocephala | Entire | 5 | Not Listed |
| Darter, longnose | Percina nasuta | Entire | 4 | Not Listed |
| Darter, Maryland | Etheostoma sellare | Entire | 5 | E |
| Darter, Niangua | Etheostoma nianguae | Entire | 3 | T |
| Darter, Okaloosa | Etheostoma okaloosae | Entire | 4 | T |
| Darter, olive | Percina squamata | Entire | 4 | Not Listed |
| Darter, paleback | Etheostoma pallididorsum | Entire | 4 | Not Listed |
| Darter, Pearl | Percina aurora | Entire | 4 | C |
| Darter, pinewoods | Etheostoma mariae | Entire | 4 | Not Listed |
| Darter, relict | Etheostoma chienense | Entire | 4 | E |
| Darter, Rio Grande | Etheostoma grahami | Entire | 2 | Not Listed |
| Darter, rock | Etheostoma rupestre | Entire | 4 | Not Listed |
| Darter, rush | Etheostoma phytophilum | Entire | 4 | E |
| Darter, sharphead | Etheostoma acuticeps | Entire | 5 | Not Listed |
| Darter, slackwater | Etheostoma boschungi | Entire | 4 | T |
| Darter, snail | Percina tanasi | Entire | 4 | T |
| Darter, spotted | Etheostoma maculatum | Entire | 5 | Not Listed |
| Darter, stargazing | Percina uranidea | Entire | 4 | Not Listed |
| Darter, striated | Etheostoma striatulum | Entire | 4 | Not Listed |
| Darter, trispot | Etheostoma trisella | Entire | 4 | Not Listed |
| Darter, Tuckaseegee | Etheostoma blenniodes guttseli | Entire | 4 | Not Listed |
| Darter, Tuscumbia | Etheostoma tuscumbia | Entire | 4 | Not Listed |
| Darter, Tuskaloosa | Etheostoma douglasi | Entire | 4 | Not Listed |
| Darter, vermilion | Etheostoma chermocki | Entire | 4 | E |
| Darter, waccamaw | Etheostoma perlongum | Entire | 4 | Not Listed |
| Darter, Warrior | Etheostoma bellator | Entire | 4 | Not Listed |
| Darter, Warrior bridled | Percina sp. | Warrior bridled | 4 | Not Listed |
| Darter, watercress | Etheostoma nuchale | Entire | 4 | E |
| Darter, yazoo | Etheostoma sp. | Entire | 4 | Not Listed |
| Darter, yellowcheek | Etheostoma moorei | Entire | 4 | E |
| Dart moth, Buchholz' | Agrotis buchholzi | Entire | 4 | Not Listed |
| Dawn-flower, Texas prairie | Hymenoxys texana | 2 | E | |
| Dayflower, climbing | Commelina gigas | 4 | Not Listed | |
| Deathcamus, sheathed | Zigadenus vaginatus | 1 | Not Listed | |
| Deer, Bactrian | Cervus elaphus bactrianus | Entire | Foreign | E |
| Deer, Barbary | Cervus elaphus barbarus | Entire | Foreign | E |
| Deer, Blackbeard Island white-tailed | Odocoileus virginianus nigribarbis | Entire | 4 | Not Listed |
| Deer, Bulls Island white-tailed | Odocoileus virginianus taurinsulae | Entire | 4 | Not Listed |
| Deer, Calamianes (=Philippine) | Axis porcinus calamianensis | Entire | Foreign | E |
| Deer, Cedros Island mule | Odocoileus hemionus cerrosensis | Entire | Foreign | E |
| Deer, Columbian white-tailed | Odocoileus virginianus leucurus | Columbia River (Clark, Cowliz, Pacific, Skamania, and Wahkiakum Counties, WA., and Clatsop, Columbia, and Multnomah Counties, OR.) | 1 | E |
| Deer, Columbian white-tailed | Odocoileus virginianus leucurus | Douglas County, Oregon | 1 | DM |
| Deer, Corsican red | Cervus elaphus corsicanus | Entire | Foreign | E |
| Deer, Eld's brow-antlered | Cervus eldi | Entire | Foreign | E |
| Deer, Formosan sika | Cervus nippon taiouanus | Entire | Foreign | E |
| Deer, Hilton Head white-tailed | Odocoileus virginianus hiltonensis | Entire | 4 | Not Listed |
| Deer, Hunting Island white-tailed | Odocoileus virginianus venatoria | Entire | 4 | Not Listed |
| Deer, Indochina hog | Axis porcinus annamiticus | Entire | Foreign | E |
| Deer, key | Odocoileus virginianus clavium | Entire | 4 | E |
| Deer, Kuhl's (=Bawean) | Axis porcinus kuhli | Entire | Foreign | E |
| Deer, marsh | Blastocerus dichotomus | Entire | Foreign | E |
| Deer, McNeill's | Cervus elaphus macneilii | Entire | Foreign | E |
| Deer, musk | Moschus spp. (all species) | Afghanistan, Bhutan, Burma, China (Tibet, Yunnan), India, Nepal, Pakistan, Sikkim | Foreign | E |
| Deer, North China sika | Cervus nippon mandarinus | Entire | Foreign | E |
| Deer, pampas | Ozotoceros bezoarticus | Entire | Foreign | E |
| Deer, Persian fallow | Dama mesopotamica (=dama m.) | Entire | Foreign | E |
| Deer, Ryukyu sika | Cervus nippon keramae | Entire | Foreign | E |
| Deer, Shansi sika | Cervus nippon grassianus | Entire | Foreign | E |
| Deer, South China sika | Cervus nippon kopschi | Entire | Foreign | E |
| Deer, swamp | Cervus duvauceli | Entire | Foreign | E |
| Deer, Visayan | Cervus alfredi | Entire | Foreign | E |
| Deer, Yarkand | Cervus elaphus yarkandensis | Entire | Foreign | E |
| Delphinium, Hutchinson's | Delphinium hutchinsonae | 1 | Not Listed | |
| Desert beauty | Linanthus bellus | 1 | Not Listed | |
| Desert-mallow, Rusby's | Sphaeralcea rusbyi eremicola | 1 | Not Listed | |
| Desert-parsley, adobe | Lomatium concinnum | 6 | Not Listed | |
| Desert-parsley, Bradshaw's | Lomatium bradshawii | 1 | E | |
| Desert-parsley, Day Valley | Lomatium minus | 1 | Not Listed | |
| Desert-parsley, Greenman's | Lomatium greenmanii | 1 | Not Listed | |
| Desert-parsley, Hoover's | Lomatium tuberosum | 1 | Not Listed | |
| Desert-parsley, Lassen | Lomatium ravenii | 1 | Not Listed | |
| Desert-parsley, red-fruited | Lomatium erythrocarpum | 1 | Not Listed | |
| Desert-parsley, Slickrock | Lomatium latilobum | 6 | Not Listed | |
| Desert-parsley, Suksdorf's | Lomatium suksdorfii | 1 | Not Listed | |
| Desert-parsley, [unnamed] | Lomatium graveolens clarkii | 6 | Not Listed | |
| Desert pink, Dolores | Lygodesmia doloresensis | 6 | Not Listed | |
| Desert-poppy, [unnamed] | Arctomecon californica | 1 | Not Listed | |
| Desert-poppy, white bear | Arctomecon merriamii | 1 | Not Listed | |
| Desertsnail, Morongo | Eremarionta morogoana | Entire | 1 | Not Listed |
| Desertsnail, Thousand Palms | Eremarionta millepalmarum | Entire | 1 | Not Listed |
| Desertsnail, white | Eremarionta immaculata | Entire | 1 | Not Listed |
| Desert-thorn, San Nicolas Island | Lycium verrucosum | 1 | Not Listed | |
| Desert-thorn, Santa Catalina Island | Lycium hassei | 1 | Not Listed | |
| Dewberry, [unnamed] | Rubus duplaris | 2 | Not Listed | |
| Dewberry, Wharton's | Rubus whartoniae | 4 | Not Listed | |
| Dhole | Cuon alpinus | Entire | Foreign | E |
| Diacyclops, Carolina well | Diacyclops jeannelli putei | Entire | 4 | Not Listed |
| Diamondflowers, [unnamed] | Hedyotis nigricans pulvinata | 4 | Not Listed | |
| Dibbler | Antechinus apicalis | Entire | Foreign | E |
| Dichondra, California | Dichondra donnelliana | 1 | Not Listed | |
| Dichondra, western | Dichondra occidentalis | 1 | Not Listed | |
| Diellia, asplenium-leaved | Diellia erecta | 1 | E | |
| Dipper, American | Cinclus mexicanus unicolor | Entire | 6 | Not Listed |
| Disc, Cockerell's striate | Discus shemeki cockerelli | Entire | 6 | Not Listed |
| disciplina | lycopodium phlegmaria var. | 6 | Not Listed | |
| Disc Lake | Discus brunsoni | Entire | 6 | Not Listed |
| Disc, marbled | Discus marmorensis | Entire | 1 | Not Listed |
| Dissanthelium, California | Dissanthelium californicum | 1 | Not Listed | |
| Ditaxis, California | Ditaxis californica | 1 | Not Listed | |
| Diving beetle, Bonita | Deronectes neomexicana | Entire | 2 | Not Listed |
| Diving beetle, curved-foot hygrotus | Hygrotus curvipes | Entire | 1 | Not Listed |
| Diving beetle, elusive hydroporus | Hydroporus elusivus | Entire | 5 | Not Listed |
| Diving beetle, fig seed | Desmopachria cenchramis | Entire | 4 | Not Listed |
| Diving beetle, Folkerts' hydroporus | Hydroporus folkertsi | Entire | 4 | Not Listed |
| Diving beetle, Leech's skyline | Hydroporus leechi | Entire | 1 | Not Listed |
| Diving beetle, Mono Lake hygrotus | Hygrotus artus | Entire | 1 | Not Listed |
| Diving beetle, narrow-foot hygrotus | Hygrotus diversipes | Entire | 6 | Not Listed |
| Diving beetle, Schwarz' | Laccophilus schwarzi | Entire | 5 | Not Listed |
| Diving beetle, simple hydroporus | Hydroporus simplex | Entire | 1 | Not Listed |
| Diving beetle, Spangler's hydroporus | Hydroporus spangleri | Entire | 6 | Not Listed |
| Diving beetle, Sulphur Springs hydroporus | Hydroporus sulphurius | Entire | 4 | Not Listed |
| Diving beetle, sylvan hygrotus | Hygrotus sylvanus | Entire | 3 | Not Listed |
| Diving beetle, Texas cave | Haideoporus texanus | Entire | 2 | Not Listed |
| Diving beetle, travertine band-thigh | Hygrotus fontinalis | Entire | 1 | Not Listed |
| Diving beetle, Utah hydroporus | Hydroporus utahensis | Entire | 6 | Not Listed |
| Diving beetle, wooly hydroporus | Hydroporus hirsutus | Entire | 1 | Not Listed |
| Dock, Chiricahua | Rumex orthoneurus | 2 | Not Listed | |
| Dodder, Bogg's Lake | Cuscuta howelliana | 1 | Not Listed | |
| Dodder, Harper's | Cuscuta harperi | 4 | Not Listed | |
| Dodder, slender | Cuscuta attenuata | 2 | Not Listed | |
| Dodder, Warner's | Cuscuta warneri | 6 | Not Listed | |
| Dodder Wyoming | Cuscuta plattensis | 6 | Not Listed | |
| Dog, African wild | Lycaon pictus | Entire | Foreign | E |
| Dogbane, Jones' | Apocynum jonesii | 2 | Not Listed | |
| Dogweed, ashy | Thymophylla tephroleuca | 2 | E | |
| Dolly Varden | Salvelinus malma | Entire | 1 | PSAT |
| Dolphin, Chinese River | Lipotes vexillifer | Entire | Foreign | E |
| Dolphin, Indus River | Platanista minor | Entire | Foreign | E |
| Dove, cloven-feathered | Drepanoptila holosericea | Entire | Foreign | E |
| Dove, Grenada gray-fronted | Leptotila rufaxilla wellsi | Entire | Foreign | E |
| Dovekie | Alle alle | Entire | NA | Not Listed |
| Dove, Mariana fruit | Ptilinopus roseicapillus | Entire | 1 | Not Listed |
| Dove, Palau ground | Gallicolumba canifrons | Entire | Foreign | DM |
| Downingia, Cuyamac Lake | Downingia concolor brevior | 1 | Not Listed | |
| Downingia, dwarf | Downingia humilis | 1 | Not Listed | |
| Draba, Bodie Hills | Cusickiella quadricostata | 1 | Not Listed | |
| Draba, branched | Draba stenoloba ramosa | 1 | Not Listed | |
| Draba, Crocker's | Draba douglasii crockeri | 1 | Not Listed | |
| Draba, Cup Lake | Draba asterophora macrocarpa | 1 | Not Listed | |
| Draba, dolomite | Draba crassifolia nevadensis | 1 | Not Listed | |
| Draba, Douglas' | Draba douglasii douglasii | 1 | Not Listed | |
| Draba, Mineral King | Draba cruciata cruciata | 1 | Not Listed | |
| Draba, Mt. Eddy | Draba carnosula | 1 | Not Listed | |
| Draba, Mt. Whitney | Draba cruciata integrifolia | 1 | Not Listed | |
| Draba, snow, little | Draba nivalis brevicula | 6 | Not Listed | |
| Draba, Sweetwater Mountains | Draba lemmonii incrassata | 1 | Not Listed | |
| Draba, Tahoe | Draba asterophora asterophora | 1 | Not Listed | |
| Draba Wasatch | Draba brachystylis | 6 | Not Listed | |
| Dragonfly, Big Thicket emerald | Somatochlora margarita | Entire | 2 | Not Listed |
| Dragonfly, Hine's emerald | Somatochlora hineana | Entire | 3 | E |
| Dragonfly, Hudson clubtail | Gomphus adelphus | Entire | 5 | Not Listed |
| Drill | Mandrillus (=Papio) leucophaeus | Entire | Foreign | E |
| Dropseed, [unnamed] | Sporobolus patens | 2 | Not Listed | |
| Dropseed, wireleaf | Sporobolus teretifolius | 4 | Not Listed | |
| Dropwort, Canby's | Oxypolis canbyi | 4 | E | |
| Dubautia, Knudsen | Dubautia knudsenii knudsenii | 1 | Not Listed | |
| Duck, fulvous whistling | Dendrocygna bicolor | Entire | 1 | Not Listed |
| Duck, harlequin | Histrionicus histrionicus | Entire | 6 | Not Listed |
| Duck, Hawaiian (=koloa) | Anas wyvilliana | Entire | 1 | E |
| Duck, Laysan | Anas laysanensis | Entire | 1 | E |
| Duck, long-tailed | Clangula hyemalis | Entire | 7 | Not Listed |
| Duck, Mexican | Anas diazi | U.S. only | 2 | DR |
| Duck, pink-headed | Rhodonessa caryophyllacea | Entire | Foreign | E |
| Duck, West Indian ruddy | Oxyura jamaicensis jamaicensis | Puerto Rico | 4 | Not Listed |
| Duck, West Indian whistling | Dendrocygna arborea | Puerto Rico | 4 | Not Listed |
| Duck, white-winged wood | Cairina scutulata | Entire | Foreign | E |
| Dudleya, candleholder | Dudleya candelabrum | 1 | Not Listed | |
| Dudleya, Conejo | Dudleya abramsii ssp. parva | 8 | T | |
| dudleya, Island green | dudleya virens ssp. insularis | 1 | Not Listed | |
| Dudleya, marcescent | Dudleya cymosa ssp. marcescens | 8 | T | |
| Dudleya, mouse-leaved | Dudleya abramsii murina | 1 | Not Listed | |
| Dudleya, Orcutt's | Dudleya attentuata orcuttii | 1 | Not Listed | |
| Dudleya, Panamint | Dudleya saxosa saxosa | 1 | Not Listed | |
| Dudleya, San Bernardino Mountains | Dudleya abramsii affinis | 1 | Not Listed | |
| Dudleya, San Gabriel Mountains | Dudleya densiflora | 1 | Not Listed | |
| Dudleya, San Gabriel River | Dudleya cymosa crebrifolia | 1 | Not Listed | |
| Dudleya, San Luis serpentine | Dudleya abramsii bettinae | 1 | Not Listed | |
| Dudleya, Santa Clara Valley | Dudleya setchellii | 8 | E | |
| Dudleya, Santa Cruz Island | Dudleya nesiotica | 8 | T | |
| Dudleya, Santa Rosa Island | Dudleya blochmaniae insularis | 1 | Not Listed | |
| Dudleya, short-leaved | Dudleya blochmaniae blochmaniae | 1 | Not Listed | |
| Dudleya, short-leaved | Dudleya blochmaniae brevifolia | 1 | Not Listed | |
| Dudleya, sp. nov. ined. (munchkin) | Dudleya sp. | 1 | Not Listed | |
| Dudleya, variegated | Dudleya variegata | 1 | Not Listed | |
| Dudleya, Verity's | Dudleya verityi | 8 | T | |
| Dudleyea, Santa Monica Mountains | Dudleya cymosa ssp. ovatifolia | 8 | T | |
| Dugong | Dugong dugon | Entire, except Palau | Foreign | E |
| Dugong | Dugong dugon | Palau | Foreign | E |
| Duiker, Jentink's | Cephalophus jentinki | Entire | Foreign | E |
| Dung beetle, Big Pine Key ataenius | Ataenius superficialis | Entire | 4 | Not Listed |
| Dung beetle, Woodruff's ataenius | Ataenius woodruffi | Entire | 4 | Not Listed |
| Duskysnail, canary | Lyogyrus spc | Entire | 8 | UR |
| Duskysnail, Columbia | Lyogyrus sp | Entire | 1 | UR |
| Duskysnail, masked | Lyogyrus spb | Entire | 1 | UR |
| Dwarf-flax, Brewer's | Hesperolinon breweri | 1 | Not Listed | |
| Dwarf-flax, Drymaria | Hesperolinon drymarioides | 1 | Not Listed | |
| Dwarf-flax, glandular | Hesperolinon adenophyllum | 1 | Not Listed | |
| Dwarf-flax, Lake County | Hesperolinon didymocarpum | 1 | Not Listed | |
| Dwarf-flax, Marin | Hesperolinon congestum | 8 | T | |
| Dwarf-flax, Tehama | Hesperolinon tehamense | 1 | Not Listed | |
| Dwarf-flax, two carpeled | Hesperolinon bicarpellatum | 1 | Not Listed | |
| Eagle, bald | Haliaeetus leucocephalus | U.S.A., conterminous (lower 48) States. | 3 | DM |
| eagle, Golden | aquila chrysaetos | Entire | 7 | Not Listed |
| Eagle, Greenland white-tailed | Haliaeetus albicilla groenlandicus | Entire | Foreign | E |
| Eagle, harpy | Harpia harpyja | Entire | Foreign | E |
| Eagle, Madagascar sea | Haliaeetus vociferoides | Entire | Foreign | E |
| Eagle, Madagascar serpent | Eutriorchis astur | Entire | Foreign | E |
| Eagle, Philippine | Pithecophaga jefferyi | Entire | Foreign | E |
| Eagle, Spanish imperial | Aquila heliaca adalberti | Entire | Foreign | E |
| earthworm, Giant Palouse | Driloleirus americanus | 1 | Not Listed | |
| Earthworm, Oregon giant | Megascolides macelfreshi | 1 | Not Listed | |
| Ebonyshell, round | Fusconaia rotulata | Entire | 4 | PE |
| Eel, American | Anguilla rostrata | Entire | 5 | UR |
| Egg-vetch, Clokey's | Astragalus oophorus clokeyanus | 1 | Not Listed | |
| Egret, Chinese | Egretta eulophotes | Entire | Foreign | E |
| Egret, reddish | Egretta rufescens | Entire | 4 | Not Listed |
| Eider, spectacled | Somateria fischeri | Entire | 7 | T |
| Eider, Steller's | Polysticta stelleri | U.S.A. (AK breeding population only) | 7 | T |
| Eland, western giant | Taurotragus derbianus derbianus | Entire | Foreign | E |
| Elepaio, Oahu | Chasiempis sandwichensis ibidis | Entire | 1 | E |
| Elephant, African | Loxodonta africana | Entire | Foreign | T |
| Elephant, Asian | Elephas maximus | Entire | Foreign | E |
| Elephantear, fluted | Elliptio mcmichaeli | Entire | 4 | Not Listed |
| Elephantear, St. Johns | Elliptio monroensis | Entire | 4 | Not Listed |
| Elfin, Marin | Incisalia mossii ssp. | Marin | 1 | Not Listed |
| Elfin, San Gabriel Mountains | Incisalia mossii ssp. | San Gabriel | 1 | Not Listed |
| Elima, black-crest | Elimia albanyensis | Entire | 4 | Not Listed |
| Elimia, acute | Elimia acuta | Entire | 4 | Not Listed |
| Elimia, ample | Elimia ampla | Entire | 4 | Not Listed |
| Elimia, banded | Elimia fascinans | Entire | 4 | Not Listed |
| Elimia, brook | Elimia strigosa | Entire | 4 | Not Listed |
| Elimia, Cahaba | Elimia cahawbensis | Entire | 4 | Not Listed |
| Elimia, caper | Elimia olivula | Entire | 4 | Not Listed |
| Elimia, coal | Elimia aterina | Entire | 4 | Not Listed |
| Elimia, cobble | Elimia vanuxemiana | Entire | 4 | Not Listed |
| Elimia, coldwater | Elimia gerhardti | Entire | 4 | Not Listed |
| Elimia, compact | Elimia showalteri | Entire | 4 | Not Listed |
| Elimia, constricted | Elimia impressa | Entire | 4 | Not Listed |
| Elimia, elegant | Elimia teres | Entire | 4 | Not Listed |
| Elimia, engraved | Elimia prestriata | Entire | 4 | Not Listed |
| Elimia, flaxen | Elimia boykiniana | Entire | 4 | Not Listed |
| Elimia, fusiform | Elimia fusiformis | Entire | 4 | Not Listed |
| Elimia, gladiator | Elimia hydei | Entire | 4 | Not Listed |
| Elimia, hearty | Elimia jonesi | Entire | 4 | Not Listed |
| Elimia, high-spired | Elimia hartmaniana | Entire | 4 | Not Listed |
| Elimia, knotty | Elimia interrupta | Entire | 4 | Not Listed |
| Elimia, lacy (snail) | Elimia crenatella | Entire | 4 | T |
| Elimia, Lily Shoals | Elimia annettae | Entire | 4 | Not Listed |
| Elimia, mossy | Elimia troostiana | Entire | 4 | Not Listed |
| Elimia, mud | Elimia alabamensis | Entire | 4 | Not Listed |
| Elimia, nymph | Elimia porreta | Entire | 4 | Not Listed |
| Elimia, pupa | Elimia pupaeformis | Entire | 4 | Not Listed |
| Elimia, puzzle | Elimia varians | Entire | 4 | Not Listed |
| Elimia, pygmy | Elimia pygmaea | Entire | 4 | Not Listed |
| Elimia, ribbed | Elimia laeta | Entire | 4 | Not Listed |
| Elimia, rough-lined | Elimia pilsbryi | Entire | 4 | Not Listed |
| Elimia, round-rib | Elimia nassula | Entire | 4 | Not Listed |
| Elimia, short-spire | Elimia brevis | Entire | 4 | Not Listed |
| Elimia, silt | Elimia haysiana | Entire | 4 | Not Listed |
| Elimia, slowwater | Elimia interveniens | Entire | 4 | Not Listed |
| Elimia, spindle | Elimia capillaris | Entire | 4 | Not Listed |
| Elimia, spring | Elimia pybasi | Entire | 4 | Not Listed |
| Elimia, squat | Elimia variata | Entire | 4 | Not Listed |
| Elimia, walnut | Elimia bellula | Entire | 4 | Not Listed |
| Elktoe, Appalachian | Alasmidonta raveneliana | Entire | 4 | E |
| Elktoe, Carolina | Alasmidonta robusta | Entire | 4 | Not Listed |
| Elktoe, Coosa | Alasmidonta maccordi | Entire | 4 | Not Listed |
| Elktoe, Cumberland | Alasmidonta atropurpurea | Entire | 4 | E |
| Elktoe, [unnamed] | Alasmidonta marginata | Entire | 6 | Not Listed |
| `Ena`ena | Pseudognaphalium (=Gnaphalium) sandwicensium var. molokaiense | 1 | C | |
| `Ena`ena, whip | Gnaphalium sandwicensium flagellare | 1 | Not Listed | |
| Ensatina, large-blotched | Ensatina eschscholtzii klauberi | Entire | 1 | Not Listed |
| Ensatina, yellow-blotched | Ensatina eschscholtzii croceator | Entire | 1 | Not Listed |
| Ephedra, funeral | Ephedra funerea | 1 | Not Listed | |
| Eriastrum, brandegee | Eriastrum brandegeae | 1 | Not Listed | |
| Erigeron, sp. nov. ined. | Erigeron sp. | 6 | Not Listed | |
| Ermine moth, chestnut | Argyresthia castaneela | Entire | 5 | Not Listed |
| Erubia | Solanum drymophilum | 4 | E | |
| eryngo, Spinysepaled | Eryngium spinosepalum | 1 | Not Listed | |
| Ethmiid moth, lost | Ethmia monachella | Entire | 6 | Not Listed |
| Eucnemid beetle, Dohrn's elegant | Paleoxenus dohrni | Entire | 1 | Not Listed |
| Eulachon, Pacific | Thaleichthys pacificus | Southern DPS—Populations spawning from the Skeena River in British Columbia (inclusive) south to the Mad River in Northern California (inclusive), Wherever found. | NMFS | T |
| Eulophia | Pteroglossaspis ecristata | 4 | Not Listed | |
| Eupatorium, Shasta | Eupatorium shastense | 1 | Not Listed | |
| Evening-primrose, Antioch Dunes | Oenothera deltoides ssp. howellii | 8 | E | |
| Evening-primrose, Eureka Valley | Oenothera avita ssp. eurekensis | 8 | E | |
| Evening-primrose, Hardham's | Camissonia hardhamiae | 1 | Not Listed | |
| Evening-primrose, Klein's | Oenothera kleinii | 6 | Not Listed | |
| Evening-primrose, Mono Hot Springs | Camissonia sierrae alticola | 1 | Not Listed | |
| Evening-primrose, Narrowleaf | Oenothera acutissima | 6 | Not Listed | |
| Evening-primrose, Organ Mountain | Oenothera organensis | 2 | Not Listed | |
| Evening-primrose, San Benito | Camissonia benitensis | 8 | T | |
| Evening-primrose, San Clemente Island | Camissonia guadalupensis clementina | 1 | Not Listed | |
| Evening-primrose, Sierra Valley | Camissonia tanacetifolia quadriperforata | 1 | Not Listed | |
| Evening-primrose, [unnamed] | Camissonia confertiflora | 2 | Not Listed | |
| Evening-primrose, [unnamed] | Camissonia exilis | 2 | Not Listed | |
| Evening-primrose, [unnamed] | Camissonia gouldii | 6 | Not Listed | |
| Evening-primrose, [unnamed] | Camissonia megalantha | 1 | Not Listed | |
| Evening-primrose, [unnamed] | Camissonia nevadensis | 1 | Not Listed | |
| Evening-primrose, [unnamed] | Camissonia parryi | 6 | Not Listed | |
| Evening-primrose, [unnamed] | Camissonia specuicola hesperia | 2 | Not Listed | |
| Evening-primrose, [unnamed] | Camissonia specuicola specuicola | 2 | Not Listed | |
| Evening-primrose, [unnamed] | Oenothera pilosella sessilis | 4 | Not Listed | |
| Evening-primrose, [unnamed] | Oenothera psammophila | 1 | Not Listed | |
| Evening-primrose, Wolf's | Oenothera wolfii | 1 | Not Listed | |
| Evening-star, White-stemmed | Mentzelia albicaulis | NA | Not Listed | |
| Everlasting, evergreen | Antennaria suffrutescens | 1 | Not Listed | |
| Fairypoppy, White | Meconella oregana | 1 | Not Listed | |
| Fairy shrimp, Conservancy | Branchinecta conservatio | Entire | 8 | E |
| Fairy shrimp, longhorn | Branchinecta longiantenna | Entire | 8 | E |
| Fairy shrimp, Riverside | Streptocephalus woottoni | Entire | 8 | E |
| Fairy shrimp, San Diego | Branchinecta sandiegonensis | Entire | 8 | E |
| Fairy shrimp, Stone Mountain | Branchinella lithaca | Entire | 4 | Not Listed |
| Fairy shrimp, vernal pool | Branchinecta lynchi | Entire | 8 | T |
| Falcon, American peregrine | Falco peregrinus anatum | Entire | 8 | DM |
| Falcon, Arctic peregrine | Falco peregrinus tundrius | Entire | 7 | DM |
| Falcon, Eurasian peregrine | Falco peregrinus peregrinus | Entire | Foreign | E |
| falcon, northern aplomado | Falco femoralis septentrionalis | Entire, except where listed as an experimental population | 2 | E |
| falcon, northern aplomado | Falco femoralis septentrionalis | Southwestern population | 2 | EXPN |
| Falcon, Peregrine | Falco peregrinus | Entire | 1 | Not Listed |
| falcon, Prairie | falco mexicanus | Entire | 2 | Not Listed |
| False dragon-head | Physostegia veroniciformis | 4 | Not Listed | |
| False dragon-head, Correll's | Physostegia correllii | 2 | Not Listed | |
| False-foxglove, auriculate | Tomanthera auriculata | 3 | Not Listed | |
| False-foxglove, Caddo purple | Tomanthera caddoensis | 4 | Not Listed | |
| False-foxglove, purple | Tomanthera skinneriana | 3 | Not Listed | |
| False-foxglove, Shinner's | Tomanthera pseudaphylla | 4 | Not Listed | |
| False foxglove, [unnamed] | Agalinis stenophylla | 4 | Not Listed | |
| False-hellebore, fringed | Veratrum fimbriatum | 1 | Not Listed | |
| False indian-mallow | Anoda abutiloides | 2 | Not Listed | |
| False indigo, [unnamed] | Amorpha ouachitensis | 2 | Not Listed | |
| False-lupine, Santa Barbara | Thermopsis macrophylla agnina | 1 | Not Listed | |
| False-lupine, velvety | Thermopsis macrophylla semota | 1 | Not Listed | |
| False pimpernel, [unnamed] | Lindernia saxicola | 4 | Not Listed | |
| False sagebrush, Laramie | Sphaeromeria simplex | 6 | Not Listed | |
| False water penny, Beer's | Acneus beeri | Entire | 1 | Not Listed |
| False water penny, Burnell's | Acneus burnelli | Entire | 1 | Not Listed |
| False water penny, Stark's | Alabameubria starki | Entire | 4 | Not Listed |
| False water penny, variegated | Dicranopselaphus variegatus | Entire | 3 | Not Listed |
| Fameflower, Goodding | Talinum gooddingii | 2 | Not Listed | |
| Fameflower, limestone | Talinum calcaricum | 4 | Not Listed | |
| Fameflower, Pinos Altos | Talinum humile | 2 | Not Listed | |
| Fameflower, rough-seeded | Talinum rugospermum | 3 | Not Listed | |
| Fameflower, Tepic | Talinum marginatum | 2 | Not Listed | |
| Fameflower, Tusayan | Talinum validulum | 2 | Not Listed | |
| Fameflower, [unnamed] | Talinum appalachianum | 4 | Not Listed | |
| Fameflower, [unnamed] | Talinum mengesii | 4 | Not Listed | |
| Fameflower, [unnamed] | Talinum okanoganense | 1 | Not Listed | |
| Fameflower, [unnamed] | Talinum thompsonii | 6 | Not Listed | |
| Fanshell | Cyprogenia stegaria | Entire | 4 | E |
| Fanshell | Cyprogenia stegaria | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Fanshell, western | Cyprogenia aberti | Entire | 4 | Not Listed |
| Fantail, Guam rufous-fronted | Rhipidura rufifrons uraniae | Entire | 1 | Not Listed |
| fatmucket, Arkansas | Lampsilis powellii | Entire | 4 | T |
| Fatmucket, Texas | Lampsilis bracteata | Entire | 2 | C |
| Fatmucket, Waccamaw | Lampsilis fullerkati | Entire | 4 | Not Listed |
| Fawn-lily, Howell's | Erythronium howellii | 1 | Not Listed | |
| Fawn-lily, Kaweah Lakes | Erythronium grandiflorum pusateri | 1 | Not Listed | |
| Fawn-lily, lemon colored | Erythronium citrinum rodrickii | 1 | Not Listed | |
| Fawn-lily, Tuolumne | Erythronium tuolumnense | 1 | Not Listed | |
| Fawnsfoot, Mexican | Truncilla cognata | Entire | 2 | UR |
| Fawnsfoot, Texas | Truncilla macrodon | Entire | 2 | C |
| Feathergrass, Porter's | Ptilagrostis porteri | 6 | UR | |
| Fern, Alabama streak-sorus | Thelypteris pilosa var. alabamensis | 4 | T | |
| Fern, Aleutian shield | Polystichum aleuticum | 7 | E | |
| Fern, American hart's-tongue | Asplenium scolopendrium var. americanum | 4 | T | |
| Fernbird, Codfish Island | Bowdleria punctata wilsoni | Entire | Foreign | UR |
| Fern, Canyon lip | Cheilanthes arizonica californicum | 2 | Not Listed | |
| Fern cloak, Lemmon | Notholaena lemmonii | 2 | Not Listed | |
| Fern, curly-grass | Schizaea germanii | 4 | Not Listed | |
| Fern, curly-grass | Schizaea pusilla | 5 | Not Listed | |
| Fern, Elfin tree | Cyathea dryopteroides | 4 | E | |
| fern, Florida bristle | Trichomanes punctatum ssp. floridanum | 4 | C | |
| Fern, hairy halberd | Tectaria coriandrifolia | 4 | Not Listed | |
| fern, Maui | Microlepia strigosa var. mauiensis | 1 | C | |
| Fern, pendant kihi | Adenophorus periens | 1 | E | |
| Fern, Pringle lip | Cheilanthes pringlei insulare | 2 | Not Listed | |
| Fern, Tunbridge | Hymenophyllum tunbrigense | 4 | Not Listed | |
| Ferret, black-footed | Mustela nigripes | Entire, except where listed as an experimental population below | 6 | E |
| Ferret, black-footed | Mustela nigripes | U.S.A. (specific portions of AZ, CO, MT, SD, UT, and WY, see 17.84(g)) | 6 | EXPN |
| Fescue, Guadalupe | Festuca ligulata | 2 | C | |
| Fescue, sedge | Festuca dasyclada | 6 | Not Listed | |
| Fetid-marigold, Rusby's | Pectis rusbyi | 2 | Not Listed | |
| Feverfew, Arkansas River | Parthenium tetraneuris | 6 | Not Listed | |
| Feverfew, [unnamed] | Parthenium ligulatum | 6 | Not Listed | |
| Fiddleneck, forked | Amsinckia vernicosa furcata | 1 | Not Listed | |
| Fiddleneck, green | Amsinckia vernicosa | 1 | Not Listed | |
| Fiddleneck, large-flowered | Amsinckia grandiflora | 8 | E | |
| Fiddleneck, Malheur Valley | Amsinckia carinata | 1 | Not Listed | |
| fieldslug, Evening | Deroceras hesperium | Entire | 1 | UR |
| Figwort, black-flowered | Scrophularia atrata | 1 | Not Listed | |
| Figwort, Organ Mountain | Scrophularia laevis | 2 | Not Listed | |
| Figwort, Santa Catalina | Scrophularia villosa | 1 | Not Listed | |
| Figwort, [unnamed] | Scrophularia macrantha | 2 | Not Listed | |
| filaree, Large-leaved | erodium macrophyllum | 6 | Not Listed | |
| Fimbristylis, Harper's | Fimbristylis perpusilla | 5 | Not Listed | |
| Fimbristylis, hot springs | Fimbristylis spadicea | 1 | Not Listed | |
| Finch, Laysan (honeycreeper) | Telespyza cantans | Entire | 1 | E |
| Finch, Nihoa (honeycreeper) | Telespyza ultima | Entire | 1 | E |
| Fire-eye, fringe-backed | Pyriglena atra | Entire | 9 | E |
| Firefly, Everglades brownwing | Photuris brunnipennis floridana | Entire | 4 | Not Listed |
| Firefly, Florida intertidal | Micronaspis floridana | Entire | 4 | Not Listed |
| Firefly, Turtle Mound | Photuris sp. | Entire | 4 | Not Listed |
| Fireweed, Oregon | Epilobium oreganum | 1 | Not Listed | |
| Fir, Fraser | Abies fraseri | 4 | Not Listed | |
| Fir, Guatemalan (=pinabete) | Abies guatemalensis | Foreign | T | |
| Fisher | Martes pennanti | Northern Rocky Mountains DPS | 6 | Not Listed |
| Fisher | Martes pennanti | West coast DPS | 8 | C |
| Fishhook cactus, Blaine's | Sclerocactus blainei | 1 | Not Listed | |
| Fishhook cactus, Great Basin | Sclerocactus pubispinus | 6 | Not Listed | |
| Fishhook cactus, Mojave | Sclerocactus polyancistrus | 1 | Not Listed | |
| Fishhook cactus, Schleser's | Sclerocactus schleseri | 1 | Not Listed | |
| Flamingo, Andean | Phoenicoparrus andinus | Entire | Foreign | E |
| Flannelbush, Mexican | Fremontodendron mexicanum | 8 | E | |
| Flannelbush, Pine Hill | Fremontodendron californicum ssp. decumbens | 8 | E | |
| flatsedge, Fragrant | Cyperus odoratus | 1 | Not Listed | |
| flatworm, (Sphalloplana mohri) | sphalloplana mohri | 6 | Not Listed | |
| Flax, Carter's small-flowered | Linum carteri carteri | 4 | C | |
| Flax, sand | Linum arenicola | 4 | C | |
| Flax, [unnamed] | Linum carteri smallii | 4 | Not Listed | |
| Flax, [unnamed] | Linum macrocarpum | 4 | Not Listed | |
| Flax, West's | Linum westii | 4 | Not Listed | |
| Fleabane, Acoma | Erigeron acomanus | 2 | Not Listed | |
| Fleabane, branched | Erigeron allocotus | 6 | Not Listed | |
| Fleabane, Chiricahua | Erigeron kuschei | 2 | Not Listed | |
| Fleabane, Clear Creek | Erigeron religiosus | 6 | Not Listed | |
| Fleabane, Del Norte | Erigeron delicatus | 1 | Not Listed | |
| Fleabane, Fish Creek | Erigeron piscaticus | 2 | Not Listed | |
| Fleabane, Gorge | Erigeron oreganus | 1 | Not Listed | |
| Fleabane, Hess's | Erigeron hessii | 2 | Not Listed | |
| Fleabane, Howell's | Erigeron howellii | 1 | Not Listed | |
| Fleabane, Lemmon | Erigeron lemmonii | 2 | C | |
| Fleabane, Mogollon | Erigeron anchana | 2 | Not Listed | |
| Fleabane, Pinalenos | Erigeron heligraphicus | 2 | Not Listed | |
| Fleabane, Sonora | Erigeron mimegletes | 2 | Not Listed | |
| Fleabane, [unnamed] | Erigeron calvus | 1 | Not Listed | |
| Fleabane, [unnamed] | Erigeron eriophyllus | 2 | Not Listed | |
| Fleabane, [unnamed] | Erigeron latus | 1 | Not Listed | |
| Fleabane, Zuni | Erigeron rhizomatus | 2 | T | |
| flicker, Gilded | colaptes chrysoides | Entire | 6 | Not Listed |
| Floater, brook | Alasmidonta varicosa | Entire | 5 | Not Listed |
| Floater, California | Anodonta californiensis | Entire | 2 | Not Listed |
| Floater, green | Lasmigona subviridis | Entire | 5 | Not Listed |
| Flower fly, Delong's mixogaster | Mixogaster delongi | Entire | 4 | Not Listed |
| flower Stonecrop Gily | Gilia sedifolia | 6 | Not Listed | |
| Fly, Belkin's dune tabanid | Brennania belkini | Entire | 1 | Not Listed |
| flycatcher, Brown-crested | myiarchus tyrannulus | Entire | 6 | Not Listed |
| Flycatcher, buff-breasted | Empidonax fulvifrons pygmaeus | Entire | 2 | UR |
| Flycatcher, Caerulean Paradise | Eutrichomyias rowleyi | Entire | Foreign | E |
| Flycatcher, Euler's | Empidonax euleri johnstonei | Entire | Foreign | E |
| Flycatcher, little willow | Empidonax traillii brewsteri | Entire | 1 | Not Listed |
| Flycatcher, olive-sided | Contopus cooperi | Entire | 7 | Not Listed |
| Flycatcher, Palau fantail | Rhipidura lepida | Entire | Foreign | DM |
| Flycatcher, Seychelles paradise | Terpsiphone corvina | Entire | Foreign | E |
| Flycatcher, southwestern willow | Empidonax traillii extimus | Entire | 2 | E |
| Flycatcher, Tahiti | Pomarea nigra | Entire | Foreign | E |
| flycatcher, Vermillion | pyrocephalus rubinus | Entire | 6 | Not Listed |
| flycatcher, Willow | empidonax traillii | Entire | 7 | Not Listed |
| Fly, Delhi Sands flower-loving | Rhaphiomidas terminatus abdominalis | Entire | 8 | E |
| Fly, El Segundo flower-loving | Rhaphiomidas terminatus terminatus | Entire | 1 | Not Listed |
| Fly, Hawaiian picture-wing | Drosophila digressa | Entire | 1 | C |
| Fly, Hawaiian picture-wing | Drosophila sharpi | Entire | 1 | E |
| Fly, Valley mydas | Drosophila alsophila | Entire | 1 | Not Listed |
| Fly, Valley mydas | Drosophila psilotarsalis | Entire | 1 | Not Listed |
| Fly, Valley mydas | Drosophila toxochaeta | Entire | 1 | Not Listed |
| Fly, Valley mydas | Rhaphiomidas trochilus | Entire | 1 | Not Listed |
| Fody, Mauritius | Foudia rubra | Entire | Foreign | E |
| Fody, Rodrigues | Foudia flavicans | Entire | Foreign | E |
| Fody, Seychelles (weaver-finch) | Foudia sechellarum | Entire | Foreign | E |
| Footsteps of spring | Sanicula arctopoides | 1 | Not Listed | |
| Forkshell | Epioblasma lewisi | Entire | 4 | Not Listed |
| Forsellesia, Clokey's | Forsellesia clokeyi | 1 | Not Listed | |
| Forsellesia, smooth pungent | Glossopetalon pungens glabra | 1 | Not Listed | |
| Four-o'clock, MacFarlane's | Mirabilis macfarlanei | 1 | T | |
| Four-o'clock, roundleaf | Mirabilis rotundifolia | 6 | Not Listed | |
| Four-o'clock, sandhill | Mirabilis collina | 2 | Not Listed | |
| Four-o'clock, [unnamed] | Mirabilis pudica | 1 | Not Listed | |
| Fox, island | Urocyon littoralis | Entire | 1 | Not Listed |
| Fox, northern swift | Vulpes velox hebes | Canada | Foreign | E |
| Fox, San Clemente Island | Urocyon littoralis clementae | Entire | 1 | Not Listed |
| Fox, San Joaquin kit | Vulpes macrotis mutica | Entire | 8 | E |
| Fox, San Miguel Island | Urocyon littoralis littoralis | Entire | 8 | E |
| Fox, San Nicolas Island | Urocyon littoralis dickeyi | Entire | 1 | Not Listed |
| Fox, Santa Catalina Island | Urocyon littoralis catalinae | Entire | 8 | E |
| Fox, Santa Cruz Island | Urocyon littoralis santacruzae | Entire | 8 | E |
| Fox, Santa Rosa Island | Urocyon littoralis santarosae | Entire | 8 | E |
| Fox, Sierra Nevada red | Vulpes vulpes necator | Entire | 8 | UR |
| Fox, Simien | Canis simensis | Entire | Foreign | E |
| Fox, swift | Vulpes velox | U.S. pop. | 6 | Not Listed |
| Foxtail cactus, Alverson's | Coryphantha vivipara alversonii | 1 | Not Listed | |
| Foxtail cactus, rose-flowered | Coryphantha vivipara rosea | 1 | Not Listed | |
| Francolin, Djibouti | Francolinus ochropectus | Entire | Foreign | E |
| Frankenia, Johnston's | Frankenia johnstonii | 2 | E | |
| Franklin tree | Franklinia alatamaha | 4 | Not Listed | |
| Freira | Pterodroma madeira | Entire | Foreign | E |
| Frigatebird, Andrew's | Fregata andrewsi | Entire | Foreign | E |
| Fringepod, Santa Cruz Island | Thysanocarpus conchuliferus | 8 | E | |
| Fringe-tree, pygmy | Chionanthus pygmaeus | 4 | E | |
| Fritillary, Atossa | Speyeria adiaste atossa | Entire | 1 | Not Listed |
| Fritillary, Butte | Fritillaria eastwoodiae | 1 | Not Listed | |
| Fritillary, Diana | Speyeria diana | Entire | 4 | Not Listed |
| Fritillary, fragrant | Fritillaria liliacea | 1 | Not Listed | |
| Fritillary, Gentner's | Fritillaria gentneri | 1 | E | |
| Fritillary, Greenhorn | Fritillaria brandegei | 1 | Not Listed | |
| Fritillary, regal | Speyeria idalia | Entire | 5 | Not Listed |
| Fritillary, Roderick's | Fritillaria grayana | 1 | Not Listed | |
| Fritillary, San Benito | Fritillaria viridea | 1 | Not Listed | |
| Fritillary, talus | Fritillaria falcata | 1 | Not Listed | |
| Fritillary, unsilvered | Speyeria adiaste | Entire | 8 | Not Listed |
| Frog, California red-legged | Rana draytonii | Entire | 8 | T |
| Frog, Carolina crawfish | Rana areolata capito | Entire | 4 | Not Listed |
| Frog, Cascades | Rana cascadae | Entire | 1 | Not Listed |
| Frog, Chiricahua leopard | Rana chiricahuensis | Entire | 2 | T |
| Frog, Columbia spotted | Rana luteiventris | Great Basin DPS | 8 | C |
| Frog, Columbia spotted | Rana luteiventris | main pop. | 6 | Not Listed |
| Frog, duckwater | Rana sp. | Entire | 1 | Not Listed |
| Frog, dusky crawfish | Rana areolata sevosa | Entire | 4 | Not Listed |
| Frog, Florida bog | Rana okaloosae | Entire | 4 | Not Listed |
| Frog, Florida crawfish | Rana areolata aesopus | Entire | 4 | Not Listed |
| Frog, foothill yellow-legged | Rana boylii | Entire | 1 | Not Listed |
| Frog, Goliath | Conraua goliath | Entire | Foreign | T |
| Frog, Illinois Strecker's chorus | Pseudacris streckeri illinoensis | Entire | 3 | Not Listed |
| Frog, Israel painted | Discoglossus nigriventer | Entire | Foreign | E |
| Frog, lowland leopard (=San Felipe leopard) | Rana yavapaiensis | Entire | 2 | Not Listed |
| Frog, Mississippi gopher | Rana capito sevosa | Wherever found west of Mobile and Tombigbee Rivers in AL, MS, and LA | 4 | E |
| Frog, mountain yellow-legged | Rana muscosa | U.S.A., all mountain yellow-legged frogs that occur north of the Tehachapi Mountains in the Sierra Nevada | 8 | C |
| Frog, mountain yellow-legged | Rana muscosa | U.S.A., southern California DPS | 8 | E |
| frog, northern leopard | Rana pipiens | Entire | 6 | Not Listed |
| frog, northern leopard | Rana pipiens | western United States | 2 | Not Listed |
| Frog, northern red-legged | Rana aurora aurora | Entire | 1 | Not Listed |
| Frog, Oregon spotted | Rana pretiosa | Entire | 1 | C |
| Frog, Panamanian golden | Atelopus varius zeteki | Entire | Foreign | E |
| Frog, Ramos bromeliad | Eleutherodactylus ramosi | Entire | 4 | Not Listed |
| Frog, Ramsey Canyon leopard | Rana subaquavocalis | Entire | 2 | Not Listed |
| Frog, relict leopard | Lithobates onca | Entire | 8 | C |
| Frog, Stephen Island | Leiopelma hamiltoni | Entire | Foreign | E |
| Frog, tailed | Ascaphus truei | Entire | 1 | Not Listed |
| Frog, Tarahumara | Rana tarahumarae | Entire | 2 | Not Listed |
| Frog, Vegas Valley leopard | Rana fisheri | Entire | 2 | Not Listed |
| Frtillary, Ojai | Fritillaria ojaiensis | 1 | Not Listed | |
| Fruit-Dove, Many-colored | Ptilinopus perousii perousii | Entire | 1 | Not Listed |
| Fryxell wort, small | Fryxellia pygmaea | 2 | Not Listed | |
| Gall fly, Po'olanui | Phaeogramma sp. | Entire | 1 | Not Listed |
| Gall moth, Busck's | Carolella busckana | Entire | 1 | Not Listed |
| Gama grass, [unnamed] | Tripsacum floridanum | 4 | Not Listed | |
| Gambusia, Amistad | Gambusia amistadensis | Entire | 2 | D3A |
| Gambusia, Big Bend | Gambusia gaigei | Entire | 2 | E |
| Gambusia, blotched | Gambusia senilis | Entire | 2 | Not Listed |
| Gambusia, Clear Creek | Gambusia heterochir | Entire | 2 | E |
| Gambusia, Pecos | Gambusia nobilis | Entire | 2 | E |
| Gambusia, San Felipe | Gambusia clarkhubbsi | Entire | 2 | Not Listed |
| Gambusia, San Marcos | Gambusia georgei | Entire | 2 | E |
| Gardenia (=Na`u), Hawaiian | Gardenia brighamii | 1 | E | |
| gartersnake, northern Mexican | Thamnophis eques megalops | Entire | 2 | C |
| Gavial | Gavialis gangeticus | Entire | Foreign | E |
| Gay-feather, slender | Liatris tenuis | 2 | Not Listed | |
| Gay-mallow, purple | Batesimalva violacea | 2 | Not Listed | |
| Gazelle, Arabian | Gazella gazella | Entire | Foreign | E |
| Gazelle, Clark's | Ammodorcas clarkei | Entire | Foreign | E |
| Gazelle, dama | Gazella dama | Entire | Foreign | E |
| Gazelle, Mhorr | Gazella dama mhorr | Entire | Foreign | E |
| Gazelle, Moroccan | Gazella dorcas massaesyla | Entire | Foreign | E |
| Gazelle, mountain (=Cuvier's) | Gazella cuvieri | Entire | Foreign | E |
| Gazelle, Pelzeln's | Gazella dorcas pelzelni | Entire | Foreign | E |
| Gazelle, Rio de Oro Dama | Gazella dama lozanoi | Entire | Foreign | E |
| Gazelle, sand | Gazella subgutturosa marica | Entire | Foreign | E |
| Gazelle, Saudi Arabian | Gazella dorcas saudiya | Entire | Foreign | E |
| Gazelle, slender-horned | Gazella leptoceros | Entire | Foreign | E |
| Gecko, barefoot | Coleonyx switaki | Entire | 1 | Not Listed |
| Gecko, day | Phelsuma edwardnewtoni | Entire | Foreign | E |
| Gecko, Monito | Sphaerodactylus micropithecus | Entire | 4 | E |
| Gecko, reticulated | Coleonyx reticulatus | Entire | 2 | Not Listed |
| Gecko, Round Island day | Phelsuma guentheri | Entire | Foreign | E |
| Gecko, San Diego banded | Coleonyx variegatus abbotti | Entire | 1 | Not Listed |
| Gecko, Serpent Island | Cyrtodactylus serpensinsula | Entire | Foreign | T |
| Gentian, Klamath | Gentiana plurisetosa | 1 | Not Listed | |
| Gentian, Mendocino | Gentiana setigera | 1 | Not Listed | |
| Gentian, moss | Gentiana fremontii | 1 | Not Listed | |
| Gentian, pine barren | Gentiana autumnalis | 5 | Not Listed | |
| Gentian, [unnamed] | Gentiana deloachii | 4 | Not Listed | |
| Gentian, wiregrass | Gentiana pennelliana | 4 | Not Listed | |
| Geometrid moth, Fraser fir | Semiothisa fraserata | Entire | 4 | Not Listed |
| Geranium, Hawaiian red-flowered | Geranium arboreum | 1 | E | |
| Geranium, native | Geranium cuneatum hololeucum | 1 | Not Listed | |
| Geranium, [unnamed] | Geranium marginale | 6 | Not Listed | |
| Geranium, [unnamed] | Geranium toquimense | 1 | Not Listed | |
| Gerardia, sandplain | Agalinis acuta | 5 | E | |
| Ghost moth, [unnamed] | Hepialus sciophanes | Entire | 4 | Not Listed |
| Gibbons | Hylobates spp. (including Nomascus) | Entire | Foreign | E |
| Gila monster, banded | Heloderma suspectum cinctum | Entire | 1 | Not Listed |
| Gilia, beautiful | Aliciella formosa | 2 | Not Listed | |
| Gilia, Hoffmann's slender-flowered | Gilia tenuiflora ssp. hoffmannii | 8 | E | |
| Gilia, Little San Bernardino Mountains | Gilia maculata | 1 | Not Listed | |
| Gilia, Little San Bernardino Mountains | Linanthus maculates | 1 | Not Listed | |
| Gilia, Monterey | Gilia tenuiflora ssp. arenaria | 8 | E | |
| Ginseng, American | Panax quinquefolius | 3 | Not Listed | |
| Glade cress, Alabama | Leavenworthia alabamica ssp. alabamica | 4 | Not Listed | |
| Glade cress, golden | Leavenworthia aurea | 2 | Not Listed | |
| Glade cress, Kentucky | Leavenworthia exigua laciniata | 4 | C | |
| Gladecress, necklace | Leavenworthia torulosa | 4 | Not Listed | |
| Gladecress, Texas golden | Leavenworthia texana | 2 | C | |
| Glade cress, [unnamed] | Leavenworthia alabamica brachystyla | 4 | Not Listed | |
| Glade cress, [unnamed] | Leavenworthia crassa elongata | 4 | Not Listed | |
| Glade cress, [unnamed] | Leavenworthia exigua lutea | 4 | Not Listed | |
| Gladecress, [unnamed] | Leavenworthia crassa | 4 | C | |
| Globe berry, lemmon | Margaranthus lemmonii | 2 | Not Listed | |
| Globeberry, Tumamoc | Tumamoca macdougalii | 2 | DP | |
| Globe-lily, The Cedars | Calochortus raichei | 1 | Not Listed | |
| Globe-mallow, Jones' | Sphaeralcea caespitosa | 1 | Not Listed | |
| Globe-mallow, Kankakee | Iliamna remota | 3 | Not Listed | |
| Globe-mallow, [unnamed] | Sphaeralcea fendleri albescens | 2 | Not Listed | |
| Glyph, blind | Glyphyalinia pecki | Entire | 4 | Not Listed |
| Glyph, Maryland | Glyphyalinia raderi | Entire | 5 | Not Listed |
| Gnatcatcher, black-tailed | Polioptila melanura californica | Entire | 1 | Not Listed |
| Gnatcatcher, coastal California | Polioptila californica californica | Entire | 8 | T |
| Goats beard, Roan Mountain false | Astilbe crenatiloba | 4 | Not Listed | |
| Goby, tidewater | Eucyclogobius newberryi | Entire | 8 | E |
| Goetzea, beautiful | Goetzea elegans | 4 | E | |
| Golden aster, Jones | Heterotheca jonesii | 6 | Not Listed | |
| Goldenbush | Isocoma arguta | 1 | Not Listed | |
| Goldenbush, Palmer's | Ericameria palmeri ssp. palmeri | 1 | Not Listed | |
| Golden carpet | Gilmania luteola | 1 | Not Listed | |
| Goldeneye, field | Helianthus ludens | 2 | Not Listed | |
| Goldenrod, Blue Ridge | Solidago spithamaea | 4 | T | |
| Goldenrod, Carolina | Solidago pulchra | 4 | Not Listed | |
| Goldenrod, Engelmann's | Haplopappus engelmannii | 6 | Not Listed | |
| goldenrod Greenwood's Heath | Ericameria lignumviridis | 6 | Not Listed | |
| Goldenrod, Houghton's | Solidago houghtonii | 3 | T | |
| Goldenrod, Porter's | Solidago porteri | 4 | Not Listed | |
| Goldenrod, Short's | Solidago shortii | 4 | E | |
| Goldenrod, spring-flowering | Solidago verna | 4 | Not Listed | |
| Goldenrod, white-haired | Solidago albopilosa | 4 | T | |
| Goldenrod, Yadkin River | Solidago plumosa | 4 | C | |
| Goldenseal | Hydrastis canadensis | 4 | Not Listed | |
| Goldenstar, dwarf | Bloomeria humilis | 1 | Not Listed | |
| Goldenstar, San Diego | Muilla clevelandii | 1 | Not Listed | |
| Goldenweed, Eastwood's | Ericameria fasciculata | 1 | Not Listed | |
| Goldenweed, small-headed | Haplopappus microcephalus | 2 | Not Listed | |
| Goldenweed, [unnamed] | Haplopappus contractus | 6 | Not Listed | |
| Goldenweed, [unnamed] | Haplopappus fremontii monocephalus | 6 | Not Listed | |
| Goldenweed, [unnamed] | Haplopappus radiatus | 1 | Not Listed | |
| Goldenweed, [unnamed] | Haplopappus salicinus | 2 | Not Listed | |
| Goldfields, Burke's | Lasthenia burkei | 8 | E | |
| Goldfields, Contra Costa | Lasthenia conjugens | 8 | E | |
| Goldfields, seaside | Lasthenia minor maritima | 1 | Not Listed | |
| Gold, July | Dedeckera eurekensis | 1 | Not Listed | |
| Goose, Aleutian Canada | Branta canadensis leucopareia | Entire | 7 | DM |
| Gooseberry, Miccosukee | Ribes echinellum | 4 | T | |
| Gooseberry, Parish's | Ribes divaricatum parishii | 1 | Not Listed | |
| Gooseberry, Santa Cruz | Ribes thacherianum | 1 | Not Listed | |
| Gooseberry, Sequoia | Ribes tularensis | 1 | Not Listed | |
| Goosefoot, Molokai | Chenopodium pekeloi | 1 | Not Listed | |
| Goosefoot, sandhill | Chenopodium cycloides | 6 | Not Listed | |
| Goose, Hawaiian | Branta (=Nesochen) sandvicensis | Entire | 1 | E |
| Goose, Tule white-fronted | Anser albifrons elgasi | Entire | 7 | Not Listed |
| Goral | Naemorhedus goral | Entire | Foreign | E |
| Gorilla | Gorilla gorilla | Entire | Foreign | E |
| Goshawk, Christmas Island | Accipiter fasciatus natalis | Entire | Foreign | E |
| Goshawk, northern | Accipiter gentilis | Entire | 2 | Not Listed |
| Goshawk, Queen Charlotte | Accipiter gentilis laingi | British Columbia Population | 7 | PE |
| Gourd, Okeechobee | Cucurbita okeechobeensis ssp. okeechobeensis | 4 | E | |
| Grackle, slender-billed | Quisicalus palustris | Entire | Foreign | E |
| Grap fern, Crater Lake | Botrychium pumicola nealleyi | 1 | Not Listed | |
| grapplinghook, Palmer's | Harpagonella palmeri | 1 | Not Listed | |
| Grapplinghook, Palmer's | Harpagonella palmeri palmeri | 1 | Not Listed | |
| Grass, bald | Sporobolus ozarkanus | 3 | Not Listed | |
| Grass, Colusa | Neostapfia colusana | 8 | T | |
| Grass, cutthroat | Panicum abscissum | 4 | Not Listed | |
| Grass, Eureka Dune | Swallenia alexandrae | 8 | E | |
| Grasshopper, Big Cedar | Eximacris phenax | Entire | 2 | Not Listed |
| Grasshopper, Central Valley | Conozoa hyalina | Entire | NA | Not Listed |
| Grasshopper, desert monkey | Psychomastix deserticola | Entire | 1 | Not Listed |
| Grasshopper, Idaho pointheaded | Acrolophitus pulchellus | Entire | 1 | Not Listed |
| Grasshopper, Lompoc | Trimerotropis occulens | Entire | NA | Not Listed |
| Grasshopper, Mexicali Lubber | Spaniacris destricola | Entire | NA | Not Listed |
| Grasshopper, Michigan bog | Appalachia arcana | Entire | 3 | Not Listed |
| Grasshopper, Pinaleno monkey | Eumorsea pinaleno | Entire | 2 | Not Listed |
| Grasshopper, San Bernardino Mountains | Trimerotropis bernardi | Entire | NA | Not Listed |
| Grasshopper, Santa Monica Mountains | Trimerotropis occidentaloides | Entire | NA | Not Listed |
| Grasshopper, Sierra pygmy | Tetrix sierrana | Entire | 1 | Not Listed |
| Grasshopper, Siskiyou chloealtis | Chloealtis aspasma | Entire | 1 | Not Listed |
| Grasshopper, superb | Eximacris superbum | Entire | 2 | Not Listed |
| Grasshopper, Torreya pygmy | Tettigidea empedonepia | Entire | 4 | Not Listed |
| Grasshopper, Zayante band-winged | Trimerotropis infantilis | Entire | 8 | E |
| Grass-of-parnassus, Carolina | Parnassia caroliniana | 4 | Not Listed | |
| Grass-of-parnassus, Kotzebue's, | Parnassia kotzebuei pumila | 1 | Not Listed | |
| grass of Parnassus, Largeleaf | Parnassia grandifolia | 4 | Not Listed | |
| Grass, pale blue-eyed | Sisyrinchium pallidum | 6 | Not Listed | |
| Grasspink, manyflower | Calopogon multiflorus | 4 | Not Listed | |
| grasspink, Oklahoma | Calopogon oklahomensis | 3 | Not Listed | |
| Grass, Solano | Tuctoria mucronata | 8 | E | |
| Grass, Tennessee yellow-eyed | Xyris tennesseensis | 4 | E | |
| Grass, Texas windmill | Chloris texensis | 2 | Not Listed | |
| grass Tushar Mountain Whitlow | Draba ramulosa | 6 | Not Listed | |
| grass Weber's Whitlow | Draba weberi | 6 | UR | |
| Grasswren, Eyrean (flycatcher) | Amytornis goyderi | Entire | Foreign | E |
| Grayling, arctic | Thymallus arcticus | Upper Missouri River DPS | 6 | C |
| greasebush, Clokey | glossopetalon clokeyi | 6 | Not Listed | |
| Greasebush, Texas | Forsellesia texensis | 2 | Not Listed | |
| Grebe, Alaotra | Tachybaptus rufolavatus | Entire | Foreign | E |
| Grebe, Atitlan | Podilymbus gigas | Entire | Foreign | E |
| Grebe, Columbian | Podiceps andinus | Entire | Foreign | UR |
| Grebe, Junin | Podiceps taczanowskii | Entire | 9 | PE |
| grebe, Western | aechmophorus occidentalis | Entire | 7 | Not Listed |
| Green-gentian, Umpqua | Frasera umpquaensis | 1 | Not Listed | |
| Green-gentian, [unnamed] | Frasera gypsicola | 1 | Not Listed | |
| Green-gentian, [unnamed] | Frasera pahutensis | 1 | Not Listed | |
| Greenshank, Nordmann's | Tringa guttifer | Entire | Foreign | E |
| Greensword | Argyroxiphium virescens | 1 | Not Listed | |
| Groovebur, incised | Agrimonia incisa | 4 | Not Listed | |
| Ground beetle, Arbuckle Cave | Horologion speokoites | Entire | 5 | Not Listed |
| Ground beetle, Beller's | Agonum belleri | Entire | 1 | Not Listed |
| ground beetle, (Bembidion gordoni) | bembidion gordoni | Entire | 8 | Not Listed |
| ground beetle, (Bembidion stillaguamish) | bembidion stillaguamish | Entire | 8 | Not Listed |
| ground beetle, (Bembidion viator) | bembidion viator | Entire | 8 | Not Listed |
| ground beetle, (Bradycellus fenderi) | bradycellus fenderi | Entire | 8 | Not Listed |
| Ground beetle, gracile anchotefflus | Anchotefflus gracilis | Entire | 1 | Not Listed |
| Ground beetle, Haleakala deropristus | Deropristus deroderus | Entire | 1 | Not Listed |
| Ground beetle, Haleakala pseudobroscus | Pseudobroscus lentus | Entire | 1 | Not Listed |
| Ground beetle, heavy metromenus | Metromenus bardus | Entire | 1 | Not Listed |
| Ground beetle, Humboldt | Scaphinotus longiceps | Entire | 1 | Not Listed |
| Ground beetle, Kauai disenochus | Disenochus micantipennis | Entire | 1 | Not Listed |
| ground beetle, (Nebria gebleri cascadensis) | nebria gebleri ssp. cascadensis | Entire | 6 | Not Listed |
| ground beetle, (Nebria kincaidi balli) | nebria kincaidi ssp. balli | Entire | 6 | Not Listed |
| ground beetle, (Nebria paradisi) | nebria paradisi | Entire | 6 | Not Listed |
| Ground beetle, Oahu blackburnia | Blackburnia insignis | Entire | 1 | Not Listed |
| Ground beetle, oceanic metromenus | Metromenus oceanicus | Entire | 1 | Not Listed |
| ground beetle, (Omus dejeanii) | omus dejeanii | Entire | 6 | Not Listed |
| ground beetle, (Pterostichus johnsoni) | pterostichus johnsoni | Entire | 6 | Not Listed |
| Ground beetle, Roth's blind | Pterostichus rothi | Entire | 2 | Not Listed |
| Ground beetle, Schaum's Blue Ridge | Sphaeroderus schaumi ssp. | Entire | 5 | Not Listed |
| Ground beetle, Siskiyou | Nebria gebleri siskiyouensis | Entire | 1 | Not Listed |
| Ground beetle, South Forks | Nebria darlingtoni | Entire | 1 | Not Listed |
| Ground beetle, transient atelothrus | Atelothrus transiens | Entire | 1 | Not Listed |
| Ground beetle, Trinity Alps | Nebria sahlbergii triad | Entire | 1 | Not Listed |
| Ground beetle, [unnamed] | Rhadine exilis | Entire | 2 | E |
| Ground beetle, [unnamed] | Rhadine infernalis | Entire | 2 | E |
| Ground beetle, [unnamed] | Rhadine ozarkensis | Entire | 4 | Not Listed |
| Ground beetle, [unnamed] | Scaphinotus behrensi | Entire | 1 | Not Listed |
| Ground beetle, [unnamed] | Scaphinotus inflectus | Entire | 4 | Not Listed |
| Ground beetle, [unnamed] | Scaphinotus parisiana | Entire | 4 | Not Listed |
| Ground beetle, wedge-winged metromenus | Metromenus cuneipennis | Entire | 1 | Not Listed |
| Ground-Dove, Friendly | Gallicolumba stairi | American Samoa DPS | 1 | C |
| Ground-dove, Guam white-throated | Gallicolumba xanthonura xanthonura | Entire | 1 | Not Listed |
| Ground-plum, Guthrie's (=Pyne's) | Astragalus bibullatus | 4 | E | |
| Groundsel Beaver Mountain | Packera castoreus | 6 | Not Listed | |
| Groundsel, Huachuca | Senecio huachucanus | 2 | Not Listed | |
| Groundsel, intermediate | Senecio dimorphophyllus intermedius | 6 | Not Listed | |
| Groundsel Podunk | Packera malmstenii | 6 | Not Listed | |
| Groundsel, Porter's | Senecio porteri | 1 | Not Listed | |
| Groundsel, San Francisco Peaks | Senecio franciscanus | 2 | T | |
| Groundsel, Spellenberg's | Senecio spellenbergii | 2 | Not Listed | |
| Groundsel, [unnamed] | Senecio hallii discoidea | 6 | Not Listed | |
| Ground squirrel, Richardson's | Spermophilus richardsoni nevadensis | Entire | 1 | Not Listed |
| Ground squirrel, White Mountains | Spermophilus tridecemlineatus monticola | Entire | 2 | Not Listed |
| Grouse, Columbian sharp-tailed | Tympanuchus phasianellus columbianus | Entire | 1 | Not Listed |
| Guaco | Mikania stevensiana | 4 | Not Listed | |
| Guajon | Eleutherodactylus cooki | Entire | 4 | T |
| Guan, Cauca | Penelope perspicax | Entire | 9 | PE |
| Guan, horned | Oreophasis derbianus | Entire | Foreign | E |
| Guan, white-winged | Penelope albipennis | Entire | Foreign | E |
| Guineafowl, white-breasted | Agelastes meleagrides | Entire | Foreign | T |
| Gull, Audouin's | Larus audouinii | Entire | Foreign | E |
| gull, Laughing | larus atricilla | Entire | 1 | Not Listed |
| Gull, relict | Larus relictus | Entire | Foreign | E |
| Gum, bear | Nyssa ursina | 4 | Not Listed | |
| Gumplant, Ash Meadows | Grindelia fraxino-pratensis | 8 | T | |
| Gumplant, Cuyamaca | Grindelia hallii | 1 | Not Listed | |
| Gumplant, Howell's | Grindelia howellii | 1 | Not Listed | |
| Gumplant, Humboldt Bay | Grindelia stricta blakei | 1 | Not Listed | |
| Gumplant, San Francisco | Grindelia hirsuta maritima | 1 | Not Listed | |
| Gumweed, plains | Grindelia oolepis | 2 | Not Listed | |
| Haha | Cyanea acuminata | 1 | E | |
| Haha | Cyanea asarifolia | 1 | E | |
| Haha | Cyanea asplenifolia | 1 | C | |
| Haha | Cyanea calycina | 1 | PE | |
| Haha | Cyanea copelandii ssp. copelandii | 1 | E | |
| Haha | Cyanea copelandii ssp. haleakalaensis | 1 | E | |
| Haha | Cyanea dolichopoda | 1 | E | |
| Haha | Cyanea dunbarii | 1 | E | |
| Haha | Cyanea eleeleensis | 1 | E | |
| Haha | Cyanea glabra | 1 | E | |
| Haha | Cyanea grimesiana ssp. grimesiana | 1 | E | |
| Haha | Cyanea grimesiana ssp. obatae | 1 | E | |
| Haha | Cyanea hamatiflora ssp. carlsonii | 1 | E | |
| Haha | Cyanea hamatiflora ssp. hamatiflora | 1 | E | |
| Haha | Cyanea humboldtiana | 1 | E | |
| Haha | Cyanea kolekoleensis | 1 | E | |
| Haha | Cyanea koolauensis | 1 | E | |
| Haha | Cyanea kuhihewa | 1 | E | |
| Haha | Cyanea kunthiana | 1 | C | |
| Haha | Cyanea lanceolata | 1 | PE | |
| Haha | Cyanea lobata | 1 | E | |
| Haha | Cyanea longiflora | 1 | E | |
| Haha | Cyanea longissima | 1 | Not Listed | |
| Haha | Cyanea macrostegia ssp. gibsonii | 1 | E | |
| Haha | Cyanea mannii | 1 | E | |
| Haha | Cyanea marksii | 1 | Not Listed | |
| Haha | Cyanea mceldowneyi | 1 | E | |
| Haha | Cyanea obtusa | 1 | C | |
| Haha | Cyanea pinnatifida | 1 | E | |
| Haha | Cyanea platyphylla | 1 | E | |
| Haha | Cyanea procera | 1 | E | |
| Haha | Cyanea pseudofauriei | 1 | Not Listed | |
| Haha | Cyanea recta | 1 | T | |
| Haha | Cyanea remyi | 1 | E | |
| Haha | Cyanea shipmanii | 1 | E | |
| Haha | Cyanea stictophylla | 1 | E | |
| Haha | Cyanea st.-johnii | 1 | E | |
| Haha | Cyanea superba | 1 | E | |
| Haha | Cyanea truncata | 1 | E | |
| Haha | Cyanea undulata | 1 | E | |
| Hairstreak, Santa Monica Mountains | Satyrium auretorum fumosum | Entire | 1 | Not Listed |
| Hairstreak, Sweadner's olive | Mitoura gryneus sweadneri | Entire | 4 | Not Listed |
| Hairstreak, Thorne's | Mitoura thornei | Entire | 8 | Not Listed |
| Haiwale | Cyrtandra paliku | 1 | E | |
| Ha`iwale | Cyrtandra biserrata | 1 | Not Listed | |
| Ha`iwale | Cyrtandra crenata | 1 | E | |
| Ha`iwale | Cyrtandra dentata | 1 | E | |
| Ha`iwale | Cyrtandra filipes | 1 | C | |
| Ha`iwale | Cyrtandra giffardii | 1 | E | |
| Ha`iwale | Cyrtandra halawensis | 1 | Not Listed | |
| Ha`iwale | Cyrtandra hematos | 1 | Not Listed | |
| Ha`iwale | Cyrtandra kaulantha | 1 | PE | |
| Ha`iwale | Cyrtandra kealiae | 1 | Not Listed | |
| Ha`iwale | Cyrtandra limahuliensis | 1 | T | |
| Ha`iwale | Cyrtandra lydgatei | 1 | Not Listed | |
| Ha`iwale | Cyrtandra macrocalyx | 1 | Not Listed | |
| Ha`iwale | Cyrtandra menziesii | 1 | Not Listed | |
| Ha`iwale | Cyrtandra munroi | 1 | E | |
| Ha`iwale | Cyrtandra oenobarba | 1 | E | |
| Ha`iwale | Cyrtandra oxybapha | 1 | C | |
| Ha`iwale | Cyrtandra pickeringii | 1 | Not Listed | |
| Ha`iwale | Cyrtandra polyantha | 1 | E | |
| Ha`iwale | Cyrtandra pruinosa | 1 | Not Listed | |
| Ha`iwale | Cyrtandra sandwicensis | 1 | Not Listed | |
| Ha`iwale | Cyrtandra sessilis | 1 | PE | |
| Ha`iwale | Cyrtandra subumbellata | 1 | E | |
| Ha`iwale | Cyrtandra tintinnabula | 1 | E | |
| Ha`iwale | Cyrtandra viridiflora | 1 | E | |
| Hala pepe | Pleomele fernaldii | 1 | C | |
| Hala pepe | Pleomele forbesii | 1 | PE | |
| Hala pepe | Pleomele hawaiiensis | 1 | E | |
| Halapepe, [unnamed] | Pleomele aurea | 1 | Not Listed | |
| Halimolobus, virgate | Halimolobos virgata | 1 | Not Listed | |
| Hanging fly, Gold rush | Orbittacus obscurus | Entire | 1 | Not Listed |
| Hao | Rauvolfia sandwicensis sandwicensis | 1 | Not Listed | |
| Haplopappus, Palmer's | Haplopappus palmeri palmeri | 1 | Not Listed | |
| Haplopappus, serpentine | Haplopappus ophitidis | 1 | Not Listed | |
| Haplopappus, Tahoe | Haplopappus eximius | 1 | Not Listed | |
| harebell, Chaparral | campanula exigua | 6 | Not Listed | |
| Harebell, Mt. Hamilton | Campanula sharsmithiae | 1 | Not Listed | |
| Harebell, Olympic | Campanula piperi | 1 | Not Listed | |
| Harebells, Avon Park | Crotalaria avonensis | 4 | E | |
| Harebell, swamp | Campanula californica | 1 | Not Listed | |
| Harebell, Wilkin's | Campanula wilkinsiana | 1 | Not Listed | |
| Hare, hispid | Caprolagus hispidus | Entire | Foreign | E |
| Hare, Sierra Nevada snowshoe | Lepus americanus tahoensis | Entire | 1 | Not Listed |
| Harperella | Ptilimnium nodosum | 5 | E | |
| harrier, Northern | circus cyaneus | Entire | 7 | Not Listed |
| Hartebeest, Swayne's | Alcelaphus buselaphus swaynei | Entire | Foreign | E |
| Hartebeest, Tora | Alcelaphus buselaphus tora | Entire | Foreign | E |
| Hartwrightia, [unnamed] | Hartwrightia floridana | 4 | Not Listed | |
| Harvestman, Anza Borrego blind | Sitalcina borregoensis | Entire | NA | Not Listed |
| Harvestman, Bee Creek Cave | Texella reddelli | Entire | 2 | E |
| Harvestman, Bone Cave | Texella reyesi | Entire | 2 | E |
| Harvestman, Cokendolpher Cave | Texella cokendolpheri | Entire | 2 | E |
| Harvestman, Edgewood blind | Calcina minor | Entire | 1 | Not Listed |
| Harvestman, Edgewood Park micro-blind | Microcina edgewoodensis | Entire | 1 | Not Listed |
| Harvestman, Graham's | Banksula grahami | Entire | NA | Not Listed |
| Harvestman, Hom's micro-blind | Microcina homi | Entire | 1 | Not Listed |
| Harvestman, Jung's micro-blind | Microcina jungi | Entire | 1 | UR |
| Harvestman, Lee's micro-blind | Microcina leei | Entire | 1 | Not Listed |
| Harvestman, Lum's micro-blind | Microcina lumi | Entire | 1 | Not Listed |
| Harvestman, Marin blind | Calicina diminua | Entire | NA | Not Listed |
| Harvestman, Melones | Banksula melones | Entire | NA | Not Listed |
| harvestman, New Comanche Trail cave | texella | Entire | 6 | Not Listed |
| Harvestman, Ross micro-blind | Microcina sp | Entire | NA | Not Listed |
| Harvestman, Silver Creek blind | Calicina jungi | Entire | NA | Not Listed |
| Harvestman, Tiburon micro-blind | Microcina tiburona | Entire | 1 | Not Listed |
| Hau kuahiwi | Hibiscadelphus crucibracteatus | 1 | Not Listed | |
| Hau kuahiwi | Hibiscadelphus giffardianus | 1 | E | |
| Hau kuahiwi | Hibiscadelphus hualalaiensis | 1 | E | |
| Hau kuahiwi | Hibiscadelphus woodii | 1 | E | |
| hawk, Cooper's | Accipiter cooperii | Entire | 8 | Not Listed |
| Hawk, ferruginous | Buteo regalis | Entire | 6 | Not Listed |
| Hawk, Galapagos | Buteo galapagoensis | Entire | Foreign | E |
| hawk, Harris' | parabuteo unicinctus | Entire | 6 | Not Listed |
| Hawk, Hawaiian (='lo) | Buteo solitarius | Entire | 1 | E |
| Hawk, northern gray | Buteo nitidus maximus | Entire | 2 | Not Listed |
| Hawk, Puerto Rican broad-winged | Buteo platypterus brunnescens | Entire | 4 | E |
| Hawk, Puerto Rican sharp-shinned | Accipiter striatus venator | Entire | 4 | E |
| hawk, Red-shouldered | buteo lineatus | Entire | 6 | Not Listed |
| hawk, Rough-legged | buteo lagopus | Entire | 7 | Not Listed |
| Hawk, Sharp shinned | Accipiter striatus | Entire | 8 | Not Listed |
| hawk, short-tailed | Buteo brachyurus | Entire | 4 | Not Listed |
| hawk, short-tailed | Buteo brachyurus | Florida population | 4 | Not Listed |
| Hawk, Swainson's | Buteo swainsoni | Entire | 3 | Not Listed |
| hawkweed, Mogollon | hieracium fendleri | 2 | Not Listed | |
| Hawkweed, Pringle | Hieracium pringlei | 2 | Not Listed | |
| Hawkweed, [unnamed] | Hieracium robinsonii | 5 | Not Listed | |
| Hawthorn, barberry-leaved | Crataegus berberifolia | 4 | Not Listed | |
| Hawthorn, Warner | Crataegus warneri | 2 | Not Listed | |
| Haw, [unnamed] | Crataegus harbisonii | 4 | Not Listed | |
| Hazardia, island | Hazardia cana | 1 | Not Listed | |
| Hazardia, Orcutt's | Hazardia orcuttii | 8 | C | |
| Heartleaf, dwarf-flowered | Hexastylis naniflora | 4 | T | |
| Heartleaf, French Broad | Hexastylis rhombiformis | 4 | Not Listed | |
| Heartleaf, Harper's | Hexastylis speciosa | 4 | Not Listed | |
| Heartleaf, [unnamed] | Hexastylis lewisii | 4 | Not Listed | |
| Heartscale | Atriplex cordulata | 1 | Not Listed | |
| Heather, mountain golden | Hudsonia montana | 4 | T | |
| Heau | Exocarpos luteolus | 1 | E | |
| Hedgehog cactus, Fitch's | Echinocereus reichenbachii fitchii | 2 | Not Listed | |
| Hedgehog cactus, golden-spined | Echinocereus chloranthus neocapillus | 2 | Not Listed | |
| Hedgehog cactus, Howe's | Echinocereus engelmannii howei | 1 | Not Listed | |
| Hedgehog cactus, Munz's | Echinocereus engelmannii munzii | 1 | Not Listed | |
| Hedgehog cactus, purple-spined | Echinocereus engelmannii var. purpureus | 6 | DO | |
| Hedgehog cactus, rusty | Echinocereus russanthus | 2 | Not Listed | |
| Hedge-hyssop, Boggs Lake | Gratiola heterosepala | 1 | Not Listed | |
| Hedge-nettle, Tallahassee | Stachys hyssopifolia lythroides | 4 | Not Listed | |
| Hedyotis, Na Pali beach | Hedyotis st.-johnii | 1 | E | |
| Hedyotis, narrow-leaved | Hedyotis angusta umbrosa | 1 | Not Listed | |
| Heelsplitter, Alabama (=inflated) | Potamilus inflatus | Entire | 4 | T |
| Heelsplitter, Barrens | Lasmigona sp. | Entire | 4 | Not Listed |
| Heelsplitter, Carolina | Lasmigona decorata | Entire | 4 | E |
| Heelsplitter, Tennessee | Lasmigona holstonia | Entire | 4 | Not Listed |
| Heelsplitter, Texas | Potamilus amphichaenus | Entire | 2 | UR |
| Hellbender | Cryptobranchus alleganiensis | Entire | 3 | Not Listed |
| Hellbender, Eastern | Cryptobranchus alleganiensis alleganiensis | Entire | 3 | Not Listed |
| Hellbender, Ozark | Cryptobranchus alleganiensis bishopi | Entire | 3 | E |
| Hellebore, false | Veratrum woodii | 4 | Not Listed | |
| Hermit, hook-billed (hummingbird) | Ramphodon (=Glaucis) dohrnii | Entire | Foreign | E |
| Hermit, Margaretta's | Phaethornis malaris margarettae | Entire | 9 | E |
| heron, Black-crowned night | nycticorax nycticorax | Entire | 6 | Not Listed |
| heron, Great blue | ardae herodias | Entire | 7 | Not Listed |
| hesperian, Big Bar | Vespericola pressleyi | Entire | 8 | UR |
| Hesperian, Karok | Vespericola karokorum | Entire | 1 | Not Listed |
| hesperian, Shasta | Vespericola shasta | Entire | 8 | UR |
| Hexalectris, Greenman's | Hexalectris grandiflora | 2 | Not Listed | |
| Hibiscus, California | Hibiscus californicus | 1 | Not Listed | |
| Hibiscus, Clay's | Hibiscus clayi | 1 | E | |
| Hicaquillo | Dendropemon sintenisii | 4 | Not Listed | |
| Hickorynut, southern | Obovaria jacksoniana | Entire | 2 | Not Listed |
| Higgins eye (pearlymussel) | Lampsilis higginsii | Entire | 3 | E |
| Higuero de sierra | Crescentia portoricensis | 4 | E | |
| Hoary-pea, pineland | Tephrosia mohrii | 4 | Not Listed | |
| Ho`awa | Pittosporum napaliense | 1 | E | |
| Hog, pygmy | Sus salvanius | Entire | Foreign | E |
| hoita, Loma Prieta | hoita strobilina | 8 | Not Listed | |
| Hoja menuda | Psidium sintenisii | 4 | Not Listed | |
| Holei | Ochrosia haleakalae | 1 | C | |
| Holei | Ochrosia kilaueaensis | 1 | E | |
| Hollisteria | Hollisteria lanata | 1 | Not Listed | |
| Holly, Cook's | Ilex cookii | 4 | E | |
| Holly, long-stalked | Ilex collina | 5 | Not Listed | |
| Holly, [unnamed] | Ilex amelanchier | 4 | Not Listed | |
| Honeycreeper, crested | Palmeria dolei | Entire | 1 | E |
| Honey-eater, cardinal | Myzomela cardinalis saffordi | Entire | 1 | Not Listed |
| Honeyeater, helmeted | Lichenostomus melanops cassidix (=Meliphaga c.) | Entire | Foreign | E |
| Honohono | Haplostachys haplostachya | 1 | E | |
| Hop hornbeam, Big Bend | Ostrya chisosensis | 2 | Not Listed | |
| Horkelia, Barton Flats | Horkelia wilderae | 1 | Not Listed | |
| Horkelia, Bolander's | Horkelia bolanderi | 1 | Not Listed | |
| Horkelia, Henderson's | Horkelia hendersonii | 1 | UR | |
| Horkelia, Parry's | Horkelia parryi | 1 | Not Listed | |
| Horkelia, Point Reyes | Horkelia marinensis | 1 | Not Listed | |
| horkelia, shaggy | Horkelia congesta ssp. congesta | 1 | Not Listed | |
| Horkelia, Tulare | Horkelia tularensis | 1 | Not Listed | |
| Horkelia, wedge-leaved | Horkelia cuneata sericea | 1 | Not Listed | |
| Hornbill, helmeted | Buceros (=Rhinoplax) vigil | Entire | Foreign | E |
| Horned lark, streaked | Eremophila alpestris strigata | Entire | 1 | C |
| Hornshell, Texas | Popenaias popei | Entire | 2 | C |
| Hornsnail, broken | Pleurocera postelli | Entire | 4 | Not Listed |
| Hornsnail, corpulent | Pleurocera corpulenta | Entire | 4 | Not Listed |
| Hornsnail, ringed | Pleurocera annulifera | Entire | 4 | Not Listed |
| Hornsnail, rough | Pleurocera foremani | Entire | 4 | E |
| Hornsnail, rugged | Pleurocera alveare | Entire | 4 | Not Listed |
| Hornsnail, shortspire | Pleurocera curta | Entire | 4 | Not Listed |
| Hornsnail, skirted | Pleurocera pyrenella | Entire | 4 | Not Listed |
| Hornsnail, spiral | Pleurocera brumbyi | Entire | 4 | Not Listed |
| Hornsnail, telescope | Pleurocera walkeri | Entire | 4 | Not Listed |
| Hornsnail, [unnamed] | Pleurocera viridulum | Entire | 4 | Not Listed |
| Hornsnail, upland | Pleurocera showalteri | Entire | 4 | Not Listed |
| Hornwort, Florida | Ceratophyllum floridanum | 4 | Not Listed | |
| Horse-mint, [unnamed] | Monarda fistulosa brevis | 5 | Not Listed | |
| Horse-mint, [unnamed] | Monarda stipitatoglandulosa | 4 | Not Listed | |
| Horse-nettle, [unnamed] | Solanum carolinense hirsutum | 4 | Not Listed | |
| Horse, Przewalski's | Equus przewalskii | Entire | Foreign | E |
| Hosackia, prostrate | Lotus nuttallianus | 1 | Not Listed | |
| Hosackia, silver, San Clemente Island | Lotus argophyllus adsurgens | 1 | Not Listed | |
| Hosackia, silver, Santa Cruz Island | Lotus argophyllus niveus | 1 | Not Listed | |
| Howellia, water | Howellia aquatilis | 6 | T | |
| Huaco, Runyon | Manfreda longiflora | 2 | Not Listed | |
| Huckleberry, box | Gaylussacia brachycera | 5 | Not Listed | |
| Huckleberry, Raynor's | Vaccinium sempervirens | 4 | Not Listed | |
| Huemul, north Andean | Hippocamelus antisensis | Entire | Foreign | E |
| Huemul, south Andean | Hippocamelus bisulcus | Entire | Foreign | E |
| Hulsea, Beautiful | Hulsea vestita ssp. callicarpha | 8 | Not Listed | |
| Hulsea, Inyo | Hulsea vestita inyoensis | 1 | Not Listed | |
| Hulumoa | Korthalsella degeneri | 1 | PE | |
| hummingbird, Honduran emerald | Amazilia luciae | Entire | 9 | UR |
| hummingbird, Rufous | selasphorus rufus | Entire | 6 | Not Listed |
| Hutia, Cabrera's | Capromys angelcabrerai | Entire | Foreign | E |
| Hutia, dwarf | Capromys nana | Entire | Foreign | E |
| Hutia, large-eared | Capromys auritus | Entire | Foreign | E |
| Hutia, little earth | Capromys sanfelipensis | Entire | Foreign | E |
| Hydrobe, Blue Spring | Aphaostracon asthenes | Entire | 4 | Not Listed |
| Hydrobe, dense | Aphaostracon pycnus | Entire | 4 | Not Listed |
| Hydrobe, Fenney Spring | Aphaostracon xynoelictus | Entire | 4 | Not Listed |
| Hydrobe, Wekiwa | Aphaostracon monas | Entire | 4 | Not Listed |
| Hydroid, [unnamed] | Ostroumovia horii | 1 | Not Listed | |
| Hyena, Barbary | Hyaena hyaena barbara | Entire | Foreign | E |
| Hyena, brown | Parahyaena (=Hyaena) brunnea | Entire | Foreign | E |
| Hymenopappus, cobweb | Hymenopappus filifolius tomentosus | 6 | Not Listed | |
| Hypericum, highlands scrub | Hypericum cumulicola | 4 | E | |
| Iagu, Hayun (=(Guam), Tronkon guafi (Rota)) | Serianthes nelsonii | 1 | E | |
| Ibex, Pyrenean | Capra pyrenaica pyrenaica | Entire | Foreign | E |
| Ibex, Walia | Capra walie | Entire | Foreign | E |
| Ibis, giant | Pseudibis gigantea | Entire | Foreign | E |
| Ibis, Japanese crested | Nipponia nippon | Entire | Foreign | E |
| Ibis, northern bald | Geronticus eremita | Entire | Foreign | E |
| Ibis, white-faced | Plegadis chihi | Entire | 1 | Not Listed |
| Ice grass | Phippsia algida | 6 | Not Listed | |
| Iguana, Acklins ground | Cyclura rileyi nuchalis | Entire | Foreign | T |
| Iguana, Allen's Cay | Cyclura cychlura inornata | Entire | Foreign | T |
| Iguana, Andros Island ground | Cyclura cychlura cychlura | Entire | Foreign | T |
| Iguana, Anegada ground | Cyclura pinguis | Entire | Foreign | E |
| Iguana, Barrington land | Conolophus pallidus | Entire | Foreign | E |
| Iguana, Cayman Brac ground | Cyclura nubila caymanensis | Entire | Foreign | T |
| Iguana, Cuban ground | Cyclura nubila nubila | Entire | Foreign | T |
| iguana, Desert | dipsosaurus dorsalis | Entire | 2 | Not Listed |
| Iguana, Exuma Island | Cyclura cychlura figginsi | Entire | Foreign | T |
| Iguana, Fiji banded | Brachylophus fasciatus | Entire | Foreign | E |
| Iguana, Fiji crested | Brachylophus vitiensis | Entire | Foreign | E |
| Iguana, Grand Cayman ground | Cyclura nubila lewisi | Entire | Foreign | E |
| Iguana, Jamaican | Cyclura collei | Entire | Foreign | E |
| Iguana, Mayaguana | Cyclura carinata bartschi | Entire | Foreign | T |
| Iguana, Mona ground | Cyclura cornuta stejnegeri | Entire | 4 | T |
| Iguana, Navassa Island | Cyclura cornuta nigerrima | Entire | 4 | Not Listed |
| Iguana, Turks and Caicos | Cyclura carinata carinata | Entire | Foreign | T |
| Iguana, Watling Island ground | Cyclura rileyi rileyi | Entire | Foreign | E |
| Iguana, White Cay ground | Cyclura rileyi cristata | Entire | Foreign | T |
| Ihi`ihi | Marsilea villosa | 1 | E | |
| Iliau, dwarf | Wilkesia hobdyi | 1 | E | |
| `Ilihia | Cyrtandra begoniifolia | 1 | Not Listed | |
| Impala, black-faced | Aepyceros melampus petersi | Entire | Foreign | E |
| Indian paintbrush, Jeff Davis Parish | Castilleja ludoviciana | 4 | Not Listed | |
| Indian paintbrush, Reveal | Castilleja revealii | 6 | Not Listed | |
| Indian paintbrush, San Clemente Island | Castilleja grisea | 8 | E | |
| Indian paintbrush, Tushar | Castilleja parvula | 6 | Not Listed | |
| Indian paintbrush, [unnamed] | Castilleja ciliata | 2 | Not Listed | |
| Indian paintbrush, [unnamed] | Castilleja scabrida | 6 | Not Listed | |
| Indigobush, Gentry's | Dalea tentaculoides | 2 | Not Listed | |
| Indigo bush, Mojave | Psorothamnus arborescens arborescens | 1 | Not Listed | |
| Indigo, Florida | Indigofera mucronata keyensis | 4 | Not Listed | |
| Indri | Indri indri (entire genus) | Entire | Foreign | E |
| Inside-out flower, Siskiyou | Vancouveria chrysantha | 1 | Not Listed | |
| Ipomopsis, Holy Ghost | Ipomopsis sancti-spiritus | 2 | E | |
| Iris, Clackamas | Iris tenuis | 1 | Not Listed | |
| Iris, dwarf lake | Iris lacustris | 3 | T | |
| Irisette, white | Sisyrinchium dichotomum | 4 | E | |
| Iris, Klamath | Iris tenax klamathensis | 1 | Not Listed | |
| Iris, [unnamed] | Iris pariensis | 6 | Not Listed | |
| Iris, [unnamed] | Iris tenax gormanii | 1 | Not Listed | |
| Ironwood, Catalina | Lyonothamnus floribundus floribundus | 1 | Not Listed | |
| Ironwood, fern-leaved | Lyonothamnus floribundus asplenifolius | 1 | Not Listed | |
| Ischaemum, Hilo | Ischaemum byrone | 1 | E | |
| Islandsnail, California McCoy snail | Micrarionta rowelli mccoiana | Entire | 1 | Not Listed |
| Islandsnail, pricklypear | Micrarionta opuntia | Entire | 1 | Not Listed |
| Islandsnail, San Clemente | Micrarionta gabbi | Entire | 1 | Not Listed |
| Islandsnail, San Nicolas | Micrarionta feralis | Entire | 1 | Not Listed |
| Islandsnail, Santa Barbara | Micrarionta facta | Entire | 1 | Not Listed |
| Islandsnail, [unnamed] | Micrarionta rowelli bakerensis | Entire | 1 | Not Listed |
| Isopod, Bat Cave | Caecidotea macropoda | Entire | 2 | Not Listed |
| isopod, (Caecidotea reddelli) | caecidotea reddelli | Entire | 6 | Not Listed |
| Isopod, Clifton Cave | Caecidotea barri | Entire | 4 | Not Listed |
| Isopod, Franz's | Caecidotea franzi | Entire | 5 | Not Listed |
| Isopod, Lee County cave | Lirceus usdagalun | Entire | 5 | E |
| Isopod, Madison Cave | Antrolana lira | Entire | 5 | T |
| isopod, (Miktoniscus) | miktoniscus | Entire | 6 | Not Listed |
| Isopod, Nickajack Cave | Caecidotea nickajackensis | Entire | 4 | Not Listed |
| Isopod, Rye Cove Cave | Lirceus culveri | Entire | 5 | Not Listed |
| Isopod, Socorro | Thermosphaeroma thermophilus | Entire | 2 | E |
| isopod, (Trichoniscidae) | trichoniscoides | Entire | 6 | Not Listed |
| Isopod, unnamed | Caecidotea acuticarpa | Entire | NA | Not Listed |
| Isopod, [unnamed] | Caecidotea cannulus | Entire | 5 | Not Listed |
| Isopod, [unnamed] | Caecidotea filicispeluncae | Entire | 3 | Not Listed |
| Isopod, [unnamed] | Caecidotea simonini | Entire | 5 | Not Listed |
| Isopod, [unnamed] | Caecidotea sinuncus | Entire | 5 | Not Listed |
| Isopod, [unnamed] | Caecidotea tomalensis | Entire | 1 | Not Listed |
| Ivesia, Ash Creek | Ivesia paniculata | 1 | Not Listed | |
| Ivesia, Ash Meadows | Ivesia kingii var. eremica | 8 | T | |
| Ivesia, Dog Valley | Ivesia aperta canina | 1 | Not Listed | |
| Ivesia, grimy | Ivesia rhypara rhypara | 1 | Not Listed | |
| Ivesia, Pickering | Ivesia pickeringii | 1 | Not Listed | |
| Ivesia, Pine Nut Mountains | Ivesia pityocharis | 1 | Not Listed | |
| Ivesia, Plumas | Ivesia sericleuca | 1 | Not Listed | |
| Ivesia, Sierra Valley | Ivesia aperta aperta | 1 | Not Listed | |
| Ivesia, silver-haired | Ivesia argyrocoma | 1 | Not Listed | |
| Ivesia, Tahquitz | Ivesia callida | 1 | Not Listed | |
| Ivesia, Venator Canyon, Shelly's | Ivesia rhypara shellyi | 1 | Not Listed | |
| Ivesia, Webber | Ivesia webberi | 8 | C | |
| Ixia, Bartram's | Salpingostylis coelestinum | 4 | Not Listed | |
| Ixia, fall-flowering | Nemastylis floridana | 4 | Not Listed | |
| Jack-bean, [unnamed] | Canavalia iaoensis | 1 | Not Listed | |
| Jack-bean, [unnamed] | Canavalia kauaiensis | 1 | Not Listed | |
| Jack-bean, [unnamed] | Canavalia kauensis | 1 | Not Listed | |
| Jack-bean, [unnamed] | Canavalia sanguinea | 1 | Not Listed | |
| Jackrabbit, San Diego black-tailed | Lepus californicus bennettii | Entire | 1 | Not Listed |
| Jackrabbit, white-sided | Lepus callotis | Entire | 2 | Not Listed |
| Jacob's ladder, Hinckley's | Polemonium pauciflorum hinckleyi | 2 | Not Listed | |
| Jacob's ladder, [unnamed] | Polemonium occidentale lacustre | 3 | Not Listed | |
| Jacob's ladder, [unnamed] | Polemonium reptans villosum | 4 | Not Listed | |
| Jacob's ladder, [unnamed] | Polemonium vanbruntiae | 5 | Not Listed | |
| Jacquemontia, beach | Jacquemontia reclinata | 4 | E | |
| Jacquemontia, pineland | Jacquemontia curtissii | 4 | Not Listed | |
| Jaguar | Panthera onca | Entire | 2 | E |
| Jaguarundi, Guatemalan | Herpailurus (=Felis) yagouaroundi fossata | Entire | Foreign | E |
| Jaguarundi, Gulf Coast | Herpailurus (=Felis) yagouaroundi cacomitli | Entire | 2 | E |
| Jaguarundi, Panamanian | Herpailurus (=Felis) yagouaroundi panamensis | Entire | Foreign | E |
| Jaguarundi, Sinaloan | Herpailurus (=Felis) yagouaroundi tolteca | Entire | 2 | E |
| Jamesianthus, Alabama | Jamesianthus alabamensis | 4 | Not Listed | |
| Jatropha, Costa Rican | Jatropha costaricensis | Foreign | E | |
| Jay, Eagle Mountain scrub | Aphelocoma coerulescens cana | Entire | 1 | Not Listed |
| Jepsonia, island | Jepsonia malvifolia | 1 | Not Listed | |
| Jerusalem cricket, Coachella Valley | Stenopelmatus cahuilaensis | Entire | 1 | Not Listed |
| Jerusalem cricket, Colton Sand Dune | Stenopelmatus spp | Entire | NA | Not Listed |
| Jerusalem cricket, Kelso | Ammopelmatus kelsoensis | Entire | 1 | Not Listed |
| Jerusalem cricket, Navajo | Stenopelmatus navajo | Entire | 2 | Not Listed |
| Jerusalem cricket, Point Conception | Ammopelmatus muwu | Entire | 1 | Not Listed |
| Jewel beetle, Algodones croton | Agrilus harenus | entire | 8 | Not Listed |
| Jewel beetle, Algodones white wax | Prasinalia imperialis | entire | 8 | Not Listed |
| Jewel beetle, Algondones sand | Lepismadora algodones | entire | 8 | Not Listed |
| Jewelflower, Auburua Ranch | Streptanthus insignis lyonii | 1 | Not Listed | |
| Jewelflower, California | Caulanthus californicus | 8 | E | |
| Jewelflower, Dorr's Cabin | Streptanthus morrisonii hirtiflorus | 1 | Not Listed | |
| Jewelflower, Evalyn's | Streptanthus farnsworthianus | 1 | Not Listed | |
| Jewelflower, few-flowered | Streptanthus sparsiflorus | 2 | Not Listed | |
| Jewelflower, Freed's | Streptanthus brachiatus hoffmanii | 1 | Not Listed | |
| Jewelflower, Howell's | Streptanthus howellii | 1 | Not Listed | |
| Jewelflower, Kruckeberg's | Streptanthus morrisonii kruckebergii | 1 | Not Listed | |
| Jewelflower, Laguna Mountains | Streptanthus bernardinus | 1 | Not Listed | |
| Jewelflower, Lemmon's | Streptanthus lemmonii | 2 | Not Listed | |
| Jewelflower, Masonic Mountain | Streptanthus oliganthus | 1 | Not Listed | |
| Jewelflower, Metcalf Canyon | Streptanthus albidus ssp. albidus | 8 | E | |
| Jewelflower, Morrison's | Streptanthus morrisonii morrisonii | 1 | Not Listed | |
| Jewelflower, most beautiful | Streptanthus albidus peramoenus | 1 | Not Listed | |
| Jewelflower, Mount Tamalpais | Streptanthus glandulosus pulchellus | 1 | Not Listed | |
| Jewelflower, Mt. Diablo | Streptanthus hispidus | 1 | Not Listed | |
| Jewelflower, Mt. Hamilton | Streptanthus callistus | 1 | Not Listed | |
| Jewelflower, Payson's | Caulanthus simulans | 1 | Not Listed | |
| Jewelflower, Piute Mountains | Streptanthus cordatus piutensis | 1 | Not Listed | |
| Jewelflower, Santa Barbara | Caulanthus amplexicaulis barbarae | 1 | Not Listed | |
| Jewelflower, secund | Streptanthus glandulosus hoffmanii | 1 | Not Listed | |
| Jewelflower, slender-pod | Caulanthus stenocarpus | 1 | Not Listed | |
| Jewelflower, sp. nov. ined. (Pit River) | Streptanthus sp. | 1 | Not Listed | |
| Jewelflower, Tamalpais | Streptanthus batrachopus | 1 | Not Listed | |
| Jewelflower, Tehipite Valley | Streptanthus fenestratus | 1 | Not Listed | |
| Jewelflower, Three Peaks | Streptanthus morrisonii elatus | 1 | Not Listed | |
| Jewelflower, Tiburon | Streptanthus niger | 8 | E | |
| Jewelflower, [unnamed] | Streptanthus squamiformis | 2 | Not Listed | |
| Jicotea | Pseudemys stejnegeri | Entire | 4 | Not Listed |
| Joint-vetch, sensitive | Aeschynomene virginica | 5 | T | |
| Jointweed, large-leaved | Polygonella macrophylla | 4 | Not Listed | |
| Jointweed, Parks' | Polygonella parksii | 2 | Not Listed | |
| Juga, Basalt | Juga sp | Entire | 1 | UR |
| Juga, cinnamon | Juga spb | Entire | 8 | UR |
| jumping-slug, Burrington | Hemphillia burringtoni | Entire | 1 | UR |
| June beetle, Atascodero | Polyphylla nubila | Entire | 1 | Not Listed |
| June Beetle, Caseys | Dinacoma caseyi | Entire | 8 | E |
| June beetle, Death Valley | Polyphylla erratica | Entire | 1 | Not Listed |
| June beetle, Delta | Polyphylla stellata | Entire | 1 | Not Listed |
| June beetle, Saline Valley snow-front | Polyphylla anteronivea | Entire | 1 | Not Listed |
| June beetle, Spotted Warner Valley Dunes | Polyphylla avittata | Entire | 6 | Not Listed |
| Kagu | Rhynochetos jubatus | Entire | Foreign | E |
| Kakapo | Strigops habroptilus | Entire | Foreign | E |
| Kamakahala | Labordia cyrtandrae | 1 | E | |
| Kamakahala | Labordia fagraeoidea fagraeoidea | 1 | Not Listed | |
| Kamakahala | Labordia helleri | 1 | E | |
| Kamakahala | Labordia lydgatei | 1 | E | |
| Kamakahala | Labordia membranacea | 1 | Not Listed | |
| Kamakahala | Labordia pumila | 1 | E | |
| Kamakahala | Labordia tinifolia var. lanaiensis | 1 | E | |
| Kamakahala | Labordia tinifolia var. wahiawaensis | 1 | E | |
| Kamakahala | Labordia triflora | 1 | E | |
| Kamanomano | Cenchrus agrimonioides | 1 | E | |
| Kampua`a | Hedyotis fluviatilis | 1 | C | |
| Kangaroo, eastern gray | Macropus giganteus | Entire | Foreign | DM |
| Kangaroo rat, Berkeley | Dipodomys heermanni berkleyensis | Entire | 8 | Not Listed |
| Kangaroo rat, big-eared | Dipodomys elephantinus | Entire | 1 | Not Listed |
| Kangaroo rat, Dolphin Island | Dipodomys microps russeolus | Entire | 6 | Not Listed |
| Kangaroo rat, Dolphin Island ord's | Dipodomys ordii cineraceus | Entire | 6 | Not Listed |
| kangaroo rat, Dulzura | dipodomys simulans | Entire | 6 | Not Listed |
| Kangaroo rat, Earthquake Merriam's | Dipodomys merriami collinus | Entire | 1 | Not Listed |
| Kangaroo rat, Fresno | Dipodomys nitratoides exilis | Entire | 8 | E |
| Kangaroo rat, giant | Dipodomys ingens | Entire | 8 | E |
| Kangaroo rat, Gunnison Island | Dipodomys microps alfredi | Entire | 6 | Not Listed |
| Kangaroo rat, Marble Canyon | Dipodomys microps leucotis | Entire | 2 | Not Listed |
| Kangaroo rat, Marysville California | Dipodomys californicus eximius | Entire | 1 | Not Listed |
| Kangaroo rat, Merced | Dipodomys heermanni dixoni | Entire | 1 | Not Listed |
| Kangaroo rat, Morro Bay | Dipodomys heermanni morroensis | Entire | 8 | E |
| Kangaroo rat, San Bernardino Merriam's | Dipodomys merriami parvus | Entire | 8 | E |
| Kangaroo rat, short-nosed | Dipodomys nitratoides brevinasus | Entire | 1 | Not Listed |
| Kangaroo rat, Stephens' | Dipodomys stephensi (incl. D. cascus) | Entire | 8 | E |
| Kangaroo rat, Texas | Dipodomys elator | Entire | 2 | UR |
| Kangaroo rat, Tipton | Dipodomys nitratoides nitratoides | Entire | 8 | E |
| Kangaroo rat, Virgin Merriam's | Dipodomys merriami frenatus | Entire | 6 | Not Listed |
| Kangaroo, red | Macropus rufus | Entire | Foreign | DM |
| Kangaroo, Tasmanian forester | Macropus giganteus tasmaniensis | Entire | Foreign | E |
| Kangaroo, western gray | Macropus fuliginosus | Entire | Foreign | DM |
| Katydid, Antioch Dunes shieldback | Neduba extincta | Entire | 1 | Not Listed |
| Katydid, Big Pine Key conehead | Belocephalus micanopy | Entire | 4 | Not Listed |
| Katydid, Jacalitos shield-backed | Ateloplus joaquin | Entire | NA | Not Listed |
| Katydid, Keys shortwinged conehead | Belocephalus sleighti | Entire | 4 | Not Listed |
| Katydid, Middlekauf's shieldback | Idiostatus middlekaufi | Entire | 1 | Not Listed |
| Katydid, Nihoa banza conehead | Banza nihoa | Entire | 1 | Not Listed |
| Katydid, Pinnacles shield-back | Idiostatus kathleenae | Entire | 1 | Not Listed |
| Katydid, remote conehead | Conocephaloides remotus | Entire | 1 | Not Listed |
| Katydid, Santa Monica shieldback | Neduba longipennis | Entire | 1 | Not Listed |
| Katydid, splendid shield-backed | Ateloplus splendidus | Entire | NA | Not Listed |
| Kauai hau kuahiwi | Hibiscadelphus distans | 1 | E | |
| Kauila | Alphitonia ponderosa | 1 | Not Listed | |
| Kauila | Colubrina oppositifolia | 1 | E | |
| Kaulu | Pteralyxia caumiana | 1 | Not Listed | |
| Kaulu | Pteralyxia kauaiensis | 1 | E | |
| Kaulu | Pteralyxia macrocarpa | 1 | PE | |
| Kawa`u | Zanthoxylum dipetalum dipetalum | 1 | Not Listed | |
| Kestrel, Mauritius | Falco punctatus | Entire | Foreign | E |
| Kestrel, Seychelles | Falco araea | Entire | Foreign | E |
| Kestrel, southeastern American | Falco sparverius paulus | Entire | 4 | Not Listed |
| Kidneyshell, fluted | Ptychobranchus subtentum | Entire | 4 | C |
| Kidneyshell, Ouachita | Ptychobranchus occidentalis | Entire | 6 | Not Listed |
| Kidneyshell, southern | Ptychobranchus jonesi | Entire | 4 | PE |
| Kidneyshell, triangular | Ptychobranchus greenii | Entire | 4 | E |
| Killifish, Waccamaw | Fundulus waccamensis | Entire | 4 | Not Listed |
| Kingfisher, Guam Micronesian | Halcyon cinnamomina cinnamomina | Entire | 1 | E |
| Kio`ele | Hedyotis coriacea | 1 | E | |
| Kiponapona | Phyllostegia racemosa | 1 | E | |
| Kite, American swallow-tailed | Elanoides forficatus forficatus | Entire | 3 | Not Listed |
| Kite, Cuba hook-billed | Chondrohierax uncinatus wilsonii | Entire | Foreign | E |
| Kite, Everglade snail | Rostrhamus sociabilis plumbeus | U.S.A. (FL) | 4 | E |
| Kite, Grenada hook-billed | Chondrohierax uncinatus mirus | Entire | Foreign | E |
| Kite, Swallow-tailed | Elanoides forficatus | Entire | 4 | Not Listed |
| kite, White-tailed | elanus caeruleus | Entire | 6 | Not Listed |
| Kite, White-tailed | Elanus leucurus | Entire | 1 | Not Listed |
| Kittentails, [unnamed] | Synthyris ranunculina | 1 | Not Listed | |
| Kittiwake, red-legged | Rissa brevirostris | Entire | 7 | Not Listed |
| Kiyi | Coregonus kiyi | Entire | 3 | Not Listed |
| Knot, red | Calidris canutus rufa | Entire | 5 | C |
| Knot, red | Calidris canutus ssp. roselaari | Entire | 7 | Not Listed |
| Knotweed, Bidwell's | Polygonum bidwelliae | 1 | Not Listed | |
| Knotweed, Marin | Polygonum marinense | 1 | Not Listed | |
| Knotweed, Monterey | Polygonum montereyense | 1 | Not Listed | |
| Knotweed, Needles | Polygonum fusiforme | 2 | Not Listed | |
| Knotweed, [unnamed] | Polygonum texense | 2 | Not Listed | |
| Koai`e | Acacia koaia | 1 | Not Listed | |
| Koala | Phascolarctos cinereus | Entire | Foreign | T |
| Kohe malama malama o kanaloa | Kanaloa kahoolawensis | 1 | E | |
| Kokako (wattlebird) | Callaeas cinerea | Entire | Foreign | E |
| Koke`e, giant | Cyanea leptostegia | 1 | Not Listed | |
| Koki`o | Kokia drynarioides | 1 | E | |
| Koki`o | Kokia kauaiensis | 1 | E | |
| Koki`o | Kokia lanceolata | 1 | Not Listed | |
| Koki`o, Cooke's | Kokia cookei | 1 | E | |
| Koki`o ke`oke`o | Hibiscus arnottianus ssp. immaculatus | 1 | E | |
| Koki`o ke`oke`o | Hibiscus waimeae ssp. hannerae | 1 | E | |
| Kolea | Myrsine fernseei | 1 | Not Listed | |
| Kolea | Myrsine fosbergii | 1 | C | |
| Kolea | Myrsine juddii | 1 | E | |
| Kolea | Myrsine knudsenii | 1 | E | |
| Kolea | Myrsine lanaiensis oahuensis | 1 | Not Listed | |
| Kolea | Myrsine linearifolia | 1 | T | |
| Kolea | Myrsine mezii | 1 | E | |
| Kolea | Myrsine petiolata | 1 | Not Listed | |
| Kolea | Myrsine st-johnii | 1 | Not Listed | |
| Kolea | Myrsine vaccinioides | 1 | C | |
| Ko`oko`olau | Bidens amplectens | 1 | PE | |
| Ko`oko`olau | Bidens campylotheca pentamera | 1 | C | |
| Ko`oko`olau | Bidens campylotheca waihoiensis | 1 | C | |
| Ko`oko`olau | Bidens cervicata | 1 | Not Listed | |
| Ko`oko`olau | Bidens conjuncta | 1 | C | |
| Ko`oko`olau | Bidens degeneri | 1 | Not Listed | |
| Ko`oko`olau | Bidens hawaiensis | 1 | Not Listed | |
| Ko`oko`olau | Bidens macrocarpa ovatifolia | 1 | Not Listed | |
| Ko`oko`olau | Bidens magnidisca | 1 | Not Listed | |
| Ko`oko`olau | Bidens mauiensis | 1 | Not Listed | |
| Ko`oko`olau | Bidens menziesii leptodonta | 1 | Not Listed | |
| Ko`oko`olau | Bidens micrantha caduca | 1 | Not Listed | |
| Ko`oko`olau | Bidens micrantha ctenophylla | 1 | C | |
| Ko`oko`olau | Bidens micrantha kaalana | 1 | Not Listed | |
| Ko`oko`olau | Bidens micrantha laciniata | 1 | Not Listed | |
| Ko`oko`olau | Bidens micrantha ssp. kalealaha | 1 | E | |
| Ko`oko`olau | Bidens molokaiensis | 1 | Not Listed | |
| Ko`oko`olau | Bidens obtusiloba | 1 | Not Listed | |
| Ko`oko`olau | Bidens pulchella | 1 | Not Listed | |
| Ko`oko`olau | Bidens sandvicensis confusa | 1 | Not Listed | |
| Ko`oko`olau | Bidens sandwicensis setosa | 1 | Not Listed | |
| Ko`oko`olau | Bidens waimeana | 1 | Not Listed | |
| Ko`oko`olau | Bidens wiebkei | 1 | E | |
| Ko`oloa`ula | Abutilon menziesii | 1 | E | |
| Kopa | Hedyotis schlechtendahliana var. remyi | 1 | E | |
| Kopiko | Psychotria grandiflora | 1 | E | |
| Kopiko | Psychotria hobdyi | 1 | E | |
| Kouprey | Bos sauveli | Entire | Foreign | E |
| Kuahiwi laukahi | Plantago hawaiensis | 1 | E | |
| Kuahiwi laukahi | Plantago princeps | 1 | E | |
| Kuawawaenohu | Alsinidendron lychnoides | 1 | E | |
| Kula wahine noho | Isodendrion pyrifolium | 1 | E | |
| Kulu`i | Nototrichium humile | 1 | E | |
| Lace bug, [unnamed] | Acalyptera susanae | Entire | 4 | Not Listed |
| Lacewing, Cheese-weed moth | Oliarces clara | Entire | 1 | Not Listed |
| Lacewing, Cookes' brown | Micromus cookeorum | Entire | 1 | Not Listed |
| Lacewing, Haleakala micromus brown | Micromus haleakalae | Entire | 1 | Not Listed |
| Lacewing, lobe-wing brown | Micromus lobipennis | Entire | 1 | Not Listed |
| Lacewing, San Francisco | Nothochrysa californica | Entire | 1 | Not Listed |
| Lacewing, Swezey's brown | Micromus swezeyi | Entire | 1 | Not Listed |
| Lacewing, Usinger's brown | Pseudopsectra usingeri | Entire | 1 | Not Listed |
| Ladies'-tresses, Ash Meadows | Spiranthes infernalis | 1 | Not Listed | |
| Ladies'-tresses, Canelo Hills | Spiranthes delitescens | 2 | E | |
| Ladies'-tresses, Navasota | Spiranthes parksii | 2 | E | |
| Ladies'-tresses, [unnamed] | Spiranthes lanceolata paludicola | 4 | Not Listed | |
| Ladies'-tresses, [unnamed] | Spiranthes polyantha | 4 | Not Listed | |
| Ladies'-tresses, Ute | Spiranthes diluvialis | 6 | T | |
| Lady's-slipper, California | Cypripedium californicum | 1 | Not Listed | |
| Lady's-slipper, clustered | Cypripedium fasciculatum | 1 | Not Listed | |
| Lady's-slipper, mountain | Cypripedium montanum | 1 | Not Listed | |
| Lady's-slipper, ram's-head | Cypripedium arietinum | 3 | Not Listed | |
| Lady's-slipper, small white | Cypripedium candidum | 3 | Not Listed | |
| Lady's-slipper, [unnamed] | Cypripedium kentuckiense | 4 | Not Listed | |
| Lampmussel, Alabama | Lampsilis virescens | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Lampmussel, Alabama | Lampsilis virescens | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Lampmussel, Haddleton | Lampsilis haddletoni | Entire | 4 | Not Listed |
| Lampmussel, yellow | Lampsilis cariosa | Entire | 5 | Not Listed |
| Lamprey, Goose Lake | Lampetra tridentata ssp. | Goose Lake | 1 | Not Listed |
| Lamprey, Kern brook | Lampetra hubbsi | Entire | 1 | Not Listed |
| Lamprey, Miller Lake | Lampetra minima | Entire | 1 | Not Listed |
| lamprey, Pacific | lampetra tridentata | Entire | 1 | Not Listed |
| Lamprey, Pacific | Lampetra tridentata ssp. | Pacific | 1 | Not Listed |
| Lamprey, river | Lampetra ayresi | Entire | 1 | Not Listed |
| Lamprey, western brook | Lampetra richardsoni | Entire | 1 | Not Listed |
| Lance, Altamaha | Elliptio shepardiana | Entire | 4 | Not Listed |
| Lance, Florida | Elliptio waltoni | Entire | 4 | Not Listed |
| Lance, Waccamaw | Elliptio sp. | Entire | 4 | Not Listed |
| Lance, yellow | Elliptio lanceolata | Entire | 4 | Not Listed |
| Langur, capped | Trachypithecus (=Presbytis) pileatus | Entire | Foreign | E |
| Langur, Douc | Pygathrix nemaeus | Entire | Foreign | E |
| Langur, Francois' | Trachypithecus (=Presbytis) francoisi | Entire | Foreign | E |
| Langur, golden | Trachypithecus (=Presbytis) geei | Entire | Foreign | E |
| Langur, gray (=entellus) | Semnopithecus (=Presbytis) entellus | Entire | Foreign | E |
| Langur, long-tailed | Presbytis potenziani | Entire | Foreign | T |
| Langur, Pagi Island | Nasalis concolor | Entire | Foreign | E |
| Langur, purple-faced | Presbytis senex | Entire | Foreign | T |
| Lanx, shortface | Fisherola nuttalli | Entire | 1 | Not Listed |
| Laphamia, Hanaupah | Perityle villosa | 1 | Not Listed | |
| Laphamia, Inyo | Perityle inyoensis | 1 | Not Listed | |
| Larch, Chilean false | Fitzroya cupressoides | Foreign | T | |
| Lark, California horned | Eremophila alpestris actia | Entire | 1 | Not Listed |
| Lark, Raso | Alauda razae | Entire | Foreign | E |
| Larkspur | Delphinium leucophaeum | 1 | Not Listed | |
| Larkspur, Alabama | Delphinium alabamicum | 4 | Not Listed | |
| Larkspur, Baker's | Delphinium bakeri | 8 | E | |
| Larkspur, Cuyamaca | Delphinium hesperium cuyamacae | 1 | Not Listed | |
| Larkspur, dune | Delphinium parryi blochmaniae | 1 | Not Listed | |
| Larkspur, Hospital Canyon | Delphinium californicum interius | 1 | Not Listed | |
| Larkspur, Mt. Pinos | Delphinium parishii purpureum | 1 | Not Listed | |
| Larkspur, northwestern | Delphinium xantholeucum | 1 | Not Listed | |
| Larkspur, peacock | Delphinium pavonaceum | 1 | Not Listed | |
| larkspur, Recurved | calochortus pulchellus | 6 | Not Listed | |
| Larkspur, recurved | Delphinium recurvatum | 1 | Not Listed | |
| Larkspur, San Clemente Island | Delphinium variegatum ssp. kinkiense | 8 | E | |
| Larkspur, tall | Delphinium exaltatum | 4 | Not Listed | |
| Larkspur, Thorne's royal | Delphinium variegatum thornei | 1 | Not Listed | |
| Larkspur, unexpected | Delphinium inopinum | 1 | Not Listed | |
| Larkspur, [unnamed] | Delphinium multiplex | 1 | Not Listed | |
| Larkspur, [unnamed] | Delphinium newtonianum | 4 | Not Listed | |
| Larkspur, [unnamed] | Delphinium nuttallianum lineapetalum | 1 | Not Listed | |
| Larkspur, [unnamed] | Delphinium treleasei | 4 | Not Listed | |
| Larkspur, Wenatchee | Delphinium viridescens | 1 | Not Listed | |
| Larkspur, yellow | Delphinium luteum | 8 | E | |
| Lathyrus, two-flowered | Lathyrus biflorus | 1 | Not Listed | |
| Lau `ehu | Panicum niihauense | 1 | E | |
| Laulihilihi | Schiedea stellarioides | 1 | E | |
| Layia, beach | Layia carnosa | 8 | E | |
| Layia, Comanche | Layia leucopappa | 1 | Not Listed | |
| Layia, Jones | Layia jonesii | 1 | Not Listed | |
| Layia, pale-yellow | Layia heterotricha | 1 | Not Listed | |
| Layia, rayless | Layia discoidea | 1 | Not Listed | |
| Layia, Ziegler's | Layia ziegleri | 1 | Not Listed | |
| Lead-plant, Carolina | Amorpha georgiana confusa | 4 | Not Listed | |
| Lead-plant, Crenulate | Amorpha crenulata | 4 | E | |
| Lead-plant, Georgia | Amorpha georgiana georgiana | 4 | Not Listed | |
| Leaf-cup, cossatot | Polymnia cossatotensis | 4 | Not Listed | |
| Leaf-flower, heather | Phyllanthus ericoides | 2 | Not Listed | |
| Leafhopper, Barrens sedge | Limotettix sp. | Entire | 5 | Not Listed |
| Leafhopper, redveined prairie | Aflexia rubranura | Entire | 3 | Not Listed |
| Leaf miner, chestnut | Tischeria perplexa | Entire | 5 | Not Listed |
| Leaf miner, Necker petrochroan | Petrochroa neckerensis | Entire | 1 | Not Listed |
| Leaf mining moth, Oahu opuhe | Philodoria ureraella | Entire | 1 | Not Listed |
| Leafroller, Greenbanded 'ohe'ohe | Spheterista pterotropiana | Entire | 1 | Not Listed |
| Leafroller, Hawaiian bean | Omoides monogona | Entire | 1 | Not Listed |
| Leafroller, `Ohe`ohe | Spheterista oheoheana | Entire | 1 | Not Listed |
| Leafroller, Wailupe | Spheterista reynoldsiana | Entire | 1 | Not Listed |
| Leafshell | Epioblasma flexuosa | Entire | 4 | Not Listed |
| Leafshell, Cumberland | Epioblasma stewardsoni | Entire | 4 | Not Listed |
| Leafy-daisy, Blockman's | Erigeron foliosus blochmaniae | 1 | Not Listed | |
| Leastdaisy, mat | Chaetopappa hersheyi | 2 | Not Listed | |
| Leather flower, Alabama | Clematis socialis | 4 | E | |
| Leatherflower, Arizona | Clematis hirsutissima arizonica | 2 | Not Listed | |
| Leatherflower, Millboro | Clematis viticaulis | 5 | Not Listed | |
| Leather flower, Morefield's | Clematis morefieldii | 4 | E | |
| Leather flower, [unnamed] | Clematis occidentalis dissecta | 1 | Not Listed | |
| Leatherflower, white-haired | Clematis albicoma | 5 | Not Listed | |
| Lechwe, red | Kobus leche | Entire | Foreign | T |
| Legenere | Legenere limosa | 1 | Not Listed | |
| lehua makanoe | Lysimachia daphnoides | 1 | E | |
| Leiodid, blind cave | Glacicavicola bathysciodes | Entire | 1 | Not Listed |
| Lemming, Dismal Swamp (=southern bog) | Synaptomys cooperi helaletes | Entire | 5 | Not Listed |
| Lemming, Kansas bog | Synaptomys cooperi paludis | Entire | 6 | Not Listed |
| Lemming, Nebraska bog | Synaptomys cooperi relictus | Entire | 6 | Not Listed |
| Lemming, northern bog | Synaptomys borealis sphagnicola | Entire | 5 | Not Listed |
| Lemurs | Lemuridae (incl. genera Lemur, Phaner, Hapalemur, Lepilemur, Microcebus, Allocebus, Cheirogaleus, Varecia) | Entire | Foreign | E |
| Leopard | Panthera pardus | In Africa, in the wild, south of, and including, the following countries: Gabon, Congo, Zaire, Uganda, Kenya | Foreign | T |
| Leopard | Panthera pardus | Wherever found, except where it is listed as Threatened as set forth below | Foreign | E |
| Leopard, clouded | Neofelis nebulosa | Entire | Foreign | E |
| Leopard, snow | Uncia (=Panthera) uncia | Entire | Foreign | E |
| Leptodactylon, sp. nov. ined. | Leptodactylon sp. | 6 | Not Listed | |
| Lessingia, San Francisco | Lessingia germanorum (=L.g. var. germanorum) | 8 | E | |
| Lessingia, Warner Springs | Lessingia glandulifera tomentosa | 1 | Not Listed | |
| Lewisia, Cantelow's | Lewisia cantelowii | 1 | Not Listed | |
| Lewisia, Congdon's | Lewisia congdonii | 1 | Not Listed | |
| Lewisia, fringed (unnamed ssp.) | Lewisia cotyledon ssp. | 1 | Not Listed | |
| Lewisia, Heckner's | Lewisia cotyledon heckneri | 1 | Not Listed | |
| Lewisia, Howell's | Lewisia cotyledon howellii | 1 | Not Listed | |
| Lewisia, long-petaled | Lewisia longipetala | 1 | Not Listed | |
| Lewisia, opposite-leaved | Lewisia oppositifolia | 1 | Not Listed | |
| Lewisia, saw-toothed | Lewisia serrata | 1 | Not Listed | |
| Lewisia, Stebbins | Lewisia stebbinsii | 1 | Not Listed | |
| Lichen, Bluff Mountain Reindeer | Cladonia psoromica | 4 | Not Listed | |
| Lichen, rock gnome | Gymnoderma lineare | 4 | E | |
| Lichen, splitting yarn | Sulcaria isidiisera | 1 | Not Listed | |
| Lichen, [unnamed] | Texosporium sancti-jacobi | 1 | Not Listed | |
| Lilaeopsis, Mason's | Lilaeopsis masonii | 1 | Not Listed | |
| Lilia de los llanos | Anthericum chandleri | 2 | Not Listed | |
| Liliwai | Acaena exigua | 1 | E | |
| Lilliput, pale (pearlymussel) | Toxolasma cylindrellus | Entire | 4 | E |
| Lilliput, purple | Toxolasma lividus | Entire | 4 | Not Listed |
| Lilliput, Savannah | Toxolasma pullus | Entire | 4 | Not Listed |
| Lily, Bolander's | Lilium bolanderi | 1 | Not Listed | |
| lily, Catalina mariposa | calochortus catalinae | 6 | Not Listed | |
| Lily, coast | Lilium maritimum | 1 | Not Listed | |
| Lily, Fairchild's | Lilium fairchildii | 1 | Not Listed | |
| Lily, Gray's | Lilium grayi | 5 | Not Listed | |
| Lily, Humboldt | Lilium humboldtii ocellatum | 1 | Not Listed | |
| Lily, lemon | Lilium parryi | 1 | Not Listed | |
| Lily, Minnesota dwarf trout | Erythronium propullans | 3 | E | |
| Lily, panhandle | Lilium iridollae | 4 | Not Listed | |
| Lily, Pitkin Marsh | Lilium pardalinum ssp. pitkinense | 8 | E | |
| Lily, small Shasta | Lilium washingtonianum minus | 1 | Not Listed | |
| Lily, Umpqua mariposa | Calochortus umpquaensis | 1 | Not Listed | |
| Lily, Vollmer's | Lilium vollmeri | 1 | Not Listed | |
| Lily, Western | Lilium occidentale | 8 | E | |
| Lily, Wiggins' | Lilium wigginsii | 1 | Not Listed | |
| Limpet, Banbury Springs | Lanx sp. | Entire | 1 | E |
| Linanthus, Baldwin Lake | Linanthus killipii | 1 | Not Listed | |
| Linanthus, Mt. Tedoc | Linanthus nuttallii howellii | 1 | Not Listed | |
| Linanthus, Orcutt's | Linanthus orcuttii | 1 | Not Listed | |
| Linanthus, Plaskett Meadows | Linanthus harknessii condensatus | 1 | Not Listed | |
| Linanthus, sand | Linanthus arenicola | 1 | Not Listed | |
| Linanthus, [unnamed] | Linanthus concinnus | 1 | Not Listed | |
| Linderiella, California | Linderiella occidentalis | Entire | 1 | Not Listed |
| linderiella, Santa Rosa | Linderiella santarosae | Entire | 1 | Not Listed |
| Linsang, spotted | Prionodon pardicolor | Entire | Foreign | E |
| Lion, Asiatic | Panthera leo persica | Entire | Foreign | E |
| Lioplax, cylindrical (snail) | Lioplax cyclostomaformis | Entire | 4 | E |
| Lip fern, fibrillose | Cheilanthes fibrillosa | 1 | Not Listed | |
| Liptooth, horseshoe | Polygyra hippocrepis | Entire | 2 | Not Listed |
| Liptooth, white | Polygyra peregrina | Entire | 4 | Not Listed |
| Liveforever, green | Dudleya virens | 1 | Not Listed | |
| Liveforever, Laguna Beach | Dudleya stolonifera | 8 | T | |
| Liveforever, many-stemmed | Dudleya multicaulis | 1 | Not Listed | |
| Liveforever, Pierpoint Springs | Dudleya cymosa costifolia | 1 | Not Listed | |
| Liveforever, Santa Barbara Island | Dudleya traskiae | 8 | E | |
| Liveforever, sticky-leaved | Dudleya viscida | 1 | Not Listed | |
| Liverword, [Unnamed] | Plagiochila sullivantii var. sullivantii | 4 | Not Listed | |
| Liverwort, Unnamed | Porella pinnata | 4 | NS | |
| Liverwort, [Unnamed] | Cylindrocolea andersonii | 4 | Not Listed | |
| Liverwort, [Unnamed] | Plagiochila sharpii | 4 | Not Listed | |
| Liverwort, [Unnamed] | Plagiochila sullivantii | 4 | Not Listed | |
| Liverwort, [Unnamed] | Plagiochila sullivantii var. spinigera | 4 | Not Listed | |
| Liverwort, [Unnamed] | Plagiochila virginica var. caroliniana | 4 | Not Listed | |
| Liverwort, [Unnamed] | Porella pinnata | 4 | Not Listed | |
| Liverwort, [Unnamed] | Sphenolobopsis pearsoni | 4 | Not Listed | |
| Lizard, Baker's worm | Amphisbaena bakeri | Entire | 4 | Not Listed |
| Lizard, black legless | Anniella pulchra nigra | Entire | 1 | Not Listed |
| Lizard, blue-tailed ground | Ameiva wetmorei | Entire | 4 | Not Listed |
| Lizard, blunt-nosed leopard | Gambelia silus | Entire | 8 | E |
| Lizard, California horned | Phrynosoma coronatum frontale | Entire | 1 | Not Listed |
| Lizard, Coachella Valley fringe-toed | Uma inornata | Entire | 8 | T |
| Lizard, Colorado Desert fringed-toed | Uma notata notata | Entire | 1 | Not Listed |
| Lizard, Cowles fringe-toed | Uma notata rufopunctata | Entire | 2 | Not Listed |
| Lizard, dunes sagebrush | Sceloporus arenicolus | Entire | 2 | PE |
| Lizard, eastern short-horned | Phrynosoma douglassii brevirostra | Entire | 6 | Not Listed |
| Lizard, flat-tailed horned | Phrynosoma mcallii | Entire | 1 | Not Listed |
| Lizard, Florida scrub | Sceloporus woodi | Entire | 4 | Not Listed |
| Lizard, gila monster | Heloderma suspectum | Entire | 2 | Not Listed |
| Lizard, gila monster | Heloderma suspectum | Utah DPS | 6 | Not Listed |
| lizard, Granite night | xantusia henshawi | Entire | 2 | Not Listed |
| lizard, Granite spiny | sceloporus orcutti | Entire | 2 | Not Listed |
| Lizard, Hierro giant | Gallotia simonyi simonyi | Entire | Foreign | E |
| Lizard, Ibiza wall | Podarcis pityusensis | Entire | Foreign | T |
| Lizard, island glass | Ophisaurus compressus | Entire | 4 | Not Listed |
| Lizard, Island night | Xantusia riversiana | Entire | 8 | T |
| lizard, Large-spotted leopard | gambelia wislizenii ssp. wislizenii | Entire | 2 | Not Listed |
| lizard, Long-nosed leopard | gambelia wislizenii | Entire | 2 | Not Listed |
| Lizard, Maria Island ground | Cnemidophorus vanzoi | Entire | Foreign | E |
| Lizard, mimic glass | Ophisaurus mimicus | Entire | 4 | Not Listed |
| Lizard, Mojave fringe-toed | Uma scoparia | Amargosa River population | 8 | Not Listed |
| Lizard, Navassa curley-tailed | Leiocephalus eremitus | Entire | 4 | Not Listed |
| Lizard, northern sagebrush | Sceloporus graciosus graciosus | Entire | 6 | Not Listed |
| Lizard, Panamint alligator | Elgaria panamintina | Entire | 1 | Not Listed |
| Lizard, reticulate collared | Crotaphytus reticulatus | Entire | 2 | Not Listed |
| Lizard, sand dune sagebrush | Sceloporus graciosus arenicolous | Entire | 2 | NS |
| Lizard, San Diego horned | Phrynosoma coronatum blainvillii | Entire | 1 | Not Listed |
| Lizard, sandstone night | Xantusia henshawi gracilis | Entire | 1 | Not Listed |
| Lizard, Sierra night | Xantusia vigilis sierrae | Entire | 1 | Not Listed |
| Lizard, silvery legless | Anniella pulchra pulchra | Entire | 1 | Not Listed |
| Lizard, southern sagebrush | Sceloporus graciosus vandenburgianus | Entire | 1 | Not Listed |
| Lizard, St. Croix ground | Ameiva polops | Entire | 4 | E |
| Lizard, Texas horned | Phrynosoma cornutum | Entire | 2 | Not Listed |
| Llanero coqui | Eleutherodactylus juanariveroi | Entire | 4 | PE |
| Lobelia, Boykin's | Lobelia boykinii | 4 | Not Listed | |
| Locoweed, Fassett's | Oxytropis campestris var. chartacea | 3 | T | |
| Locoweed, Kobuk | Oxytropis kobukensis | 7 | Not Listed | |
| Locust, Lake Huron | Trimerotropis huroniana | Entire | 3 | Not Listed |
| Loeflingia, sage-like | Loeflingia squarrosa artemisiarum | 1 | Not Listed | |
| Logperch, Blotchside | Percina burtoni | Entire | 5 | Not Listed |
| Logperch, Conasauga | Percina jenkinsi | Entire | 4 | E |
| Logperch, Roanoke | Percina rex | Entire | 5 | E |
| Lomatium, Big Pine | Lomatium rigidum | 1 | Not Listed | |
| Lomatium, Congdon's | Lomatium congdonii | 1 | Not Listed | |
| Lomatium, Cook's | Lomatium cookii | 1 | E | |
| Lomatium, Howell's | Lomatium howellii | 1 | Not Listed | |
| Lomatium, Inyo | Lomatium foeniculaceum inyoense | 1 | Not Listed | |
| Lomatium, Owens Peak | Lomatium shevockii | 1 | Not Listed | |
| Lomatium, Peck's | Lomatium peckianum | 1 | Not Listed | |
| Lomatium, San Nicolas Island | Lomatium insulare | 1 | Not Listed | |
| Lomatium, Stebbins' | Lomatium stebbinsii | 1 | Not Listed | |
| Long-horned beetle, ahinahina | Plagiithmysus swezeyanus | Entire | 1 | Not Listed |
| Long-horned beetle, bidens | Plagithmysus bidensae | Entire | 1 | Not Listed |
| Long-horned beetle, Bridwell's | Plagithmysus bridwelli | Entire | 1 | Not Listed |
| Long-horned beetle, Forbes' Kauai | Plagithmysus forbesianus | Entire | 1 | Not Listed |
| Long-horned beetle, Forbes' Maui | Plagithmysus forbesii | Entire | 1 | Not Listed |
| Long-horned beetle, Greenwell's | Plagithmysus greenwelli | Entire | 1 | Not Listed |
| Long-horned beetle, Haas' `iliahi | Plagithmysus haasi | Entire | 1 | Not Listed |
| Long-horned beetle, Hawaii alani | Plagithmysus vicinus | Entire | 1 | Not Listed |
| Long-horned beetle, Hawaii clubbed | Plagithmysus claviger | Entire | 1 | Not Listed |
| Long-horned beetle, Hawaii decorus | Plagithmysus decorus | Entire | 1 | Not Listed |
| Long-horned beetle, Hawaii elegant | Plagithmysus elegans | Entire | 1 | Not Listed |
| Long-horned beetle, Hawaii opuhe | Plagithmysus sulphurescens | Entire | 1 | Not Listed |
| Long-horned beetle, Hawaii podagricus | Plagithmysus podagricus | Entire | 1 | Not Listed |
| Long-horned beetle, Hawaii uhiuhi | Plagithmysus mezoneuri | Entire | 1 | Not Listed |
| Long-horned beetle, Kauai `ahakea | Plagithmysus permundus | Entire | 1 | Not Listed |
| Long-horned beetle, Kauai annectant | Plagithmysus annectans | Entire | 1 | Not Listed |
| Long-horned beetle, Kauai holio | Plagithmysus polystictus | Entire | 1 | Not Listed |
| Long-horned beetle, Kauai kalia | Plagithmysus ignotus | Entire | 1 | Not Listed |
| Long-horned beetle, Kauai swamp | Plagithmysus paludis | Entire | 1 | Not Listed |
| Long-horned beetle, Kohala | Plagithmysus kohalae | Entire | 1 | Not Listed |
| Long-horned beetle, Krauss' | Plagithmysus kraussi | Entire | 1 | Not Listed |
| Long-horned beetle, Kuhns' Oahu | Plagithmysus kuhnsi | Entire | 1 | Not Listed |
| Long-horned beetle, Lanai `ohi`a | Plagithmysus lanaiensis | Entire | 1 | Not Listed |
| Long-horned beetle, long-necked | Plagithmysus longicollis | Entire | 1 | Not Listed |
| Long-horned beetle, Maui `akala | Plagithmysus rubi | Entire | 1 | Not Listed |
| Long-horned beetle, Maui alani | Plagithmysus alani | Entire | 1 | Not Listed |
| Long-horned beetle, Maui dubautia | Plagithmysus dubautianus | Entire | 1 | Not Listed |
| Long-horned beetle, Maui forest | Plagithmysus sylvai | Entire | 1 | Not Listed |
| Long-horned beetle, Maui koa | Plagithmysus koae | Entire | 1 | Not Listed |
| Long-horned beetle, Maui mamaki | Plagithmysus pipturicola | Entire | 1 | Not Listed |
| Long-horned beetle, Maui similar | Plagithmysus simillimus | Entire | 1 | Not Listed |
| Long-horned beetle, Maui speculifer | Plagithmysus speculifer | Entire | 1 | Not Listed |
| Long-horned beetle, Maui wide-necked | Plagithmysus laticollis | Entire | 1 | Not Listed |
| Long-horned beetle, Molokai fractured | Plagithmysus fractus | Entire | 1 | Not Listed |
| Long-horned beetle, Muir's ala`a | Plagithmysus muiri | Entire | 1 | Not Listed |
| Long-horned beetle, Nihoa | Plagithmysus nihoae | Entire | 1 | Not Listed |
| Long-horned beetle, Oahu super | Plagithmysus superstes | Entire | 1 | Not Listed |
| Long-horned beetle, Ohi`a | Plagithmysus pulvillatus | Entire | 1 | Not Listed |
| Long-horned beetle, Pilo kea | Plagithmysus platydesmae | Entire | 1 | Not Listed |
| Long-horned beetle, Rude's | Necydalis rudei | Entire | 1 | Not Listed |
| Long-horned beetle, simple-necked | Plagithmysus simplicollis | Entire | 1 | Not Listed |
| Long-horned beetle, sixbanded | Dryobius sexnotatus | Entire | 4 | Not Listed |
| Long-horned beetle, Swezey's | Plagithmysus swezeyi | Entire | 1 | Not Listed |
| Longhorn moth, Opler's | Adella oplerella | Entire | 1 | Not Listed |
| Long-legged fly, Ko`olau spurwing | Campsicnemus mirabilis | Entire | 1 | Not Listed |
| loon, Common | gavia immer | Entire | 7 | Not Listed |
| Loon, yellow-billed | Gavia adamsii | Entire | 7 | C |
| Looper, Hawaiian hopseed | Scotorythra paratactis | Entire | 1 | Not Listed |
| Looper, Ioxanthan | Kauaiina ioxantha | Entire | 1 | Not Listed |
| Looper, Kona giant | Scotorythra megalophylla | Entire | 1 | Not Listed |
| Looper, Ko`olau giant | Scotorythra nesiotes | Entire | 1 | Not Listed |
| Looper moth, [unnamed] | Euchlaena milnei | Entire | 5 | Not Listed |
| Looper moth, [unnamed] | Lambdina canitiaria | Entire | 5 | Not Listed |
| Looper moth, [unnamed] | Lytrosis permagnaria | Entire | 4 | Not Listed |
| Looper, `Ola`a pepppered | Tritocleis microphylla | Entire | 1 | Not Listed |
| Loosestrife, Fraser's yellow | Lysimachia fraseri | 4 | Not Listed | |
| Loosestrife, fringed | Steironema laevigatum | 5 | Not Listed | |
| Loosestrife, rough-leaved | Lysimachia asperulaefolia | 4 | E | |
| Loris, lesser slow | Nycticebus pygmaeus | Entire | Foreign | T |
| Lotus, Otay | Lotus crassifolius otayensis | 1 | Not Listed | |
| Lotus, red-flowered | Lotus rubriflorus | 1 | Not Listed | |
| Lo`ulu | Pritchardia affinis | 1 | E | |
| Lo`ulu | Pritchardia elliptica | 1 | Not Listed | |
| Lo`ulu | Pritchardia eriophora | 1 | Not Listed | |
| Lo`ulu | Pritchardia gaudichaudii | 1 | Not Listed | |
| Lo`ulu | Pritchardia glabrata | 1 | Not Listed | |
| Lo`ulu | Pritchardia kaalae | 1 | E | |
| Lo`ulu | Pritchardia kahanae | 1 | Not Listed | |
| Lo`ulu | Pritchardia lanaiensis | 1 | Not Listed | |
| Lo`ulu | Pritchardia montis-kea | 1 | Not Listed | |
| Lo`ulu | Pritchardia munroi | 1 | E | |
| Lo`ulu | Pritchardia napaliensis | 1 | E | |
| Lo`ulu | Pritchardia remota | 1 | E | |
| Lo`ulu | Pritchardia schattaueri | 1 | E | |
| Lo`ulu | Pritchardia viscosa | 1 | E | |
| Lo`ulu, (=Lo`ulu lelo) | Pritchardia hillebrandii | 1 | Not Listed | |
| Lo`ulu, (=Na`ena`e) | Pritchardia hardyi | 1 | E | |
| Lousewort, Dudley's | Pedicularis dudleyi | 1 | Not Listed | |
| Lousewort, Furbish | Pedicularis furbishiae | 5 | E | |
| Lousewort, Howell's | Pedicularis howellii | 1 | Not Listed | |
| Love grass, Fosberg's | Eragrostis fosbergii | 1 | E | |
| Love grass, Maui | Eragrostis mauiensis | 1 | Not Listed | |
| Love grass, Ni`ihau | Eragrostis niihauensis | 1 | Not Listed | |
| Love grass, Sanibel | Eragrostis tracyi | 4 | Not Listed | |
| Lupine, Anthony Peak | Lupinus antoninus | 1 | Not Listed | |
| Lupine, Ashland | Lupinus lepidus var. ashlandensis | 1 | UR | |
| Lupine, Biddle's | Lupinus biddlei | 1 | Not Listed | |
| Lupine, clover | Lupinus tidestromii | 8 | E | |
| Lupine, Cobb Mountain | Lupinus sericatus | 1 | Not Listed | |
| Lupine, Cusick's | Lupinus cusickii | 1 | Not Listed | |
| Lupine, DeDecker's | Lupinus padre-crowleyi | 1 | Not Listed | |
| Lupine, Guadalupe Island | Lupinus guadalupensis | 1 | Not Listed | |
| Lupine, Gulfcoast | Lupinus westianus | 4 | Not Listed | |
| Lupine, Holmgren's | Lupinus holmgrenanus | 1 | Not Listed | |
| Lupine, Hoskett Meadows | Lupinus culbertsonii culbertsonii | 1 | Not Listed | |
| Lupine, Inyo | Lupinus inyoensis | 1 | Not Listed | |
| Lupine, Kincaid's | Lupinus sulphureus (=oreganus) ssp. kincaidii (=var. kincaidii) | 1 | T | |
| Lupine, Mariposa | Lupinus citrinus deflexus | 1 | Not Listed | |
| Lupine, Milo Baker's | Lupinus milo-bakeri | 1 | Not Listed | |
| Lupine, Mono Lake | Lupinus duranii | 1 | Not Listed | |
| Lupine, Nipomo Mesa | Lupinus nipomensis | 8 | E | |
| Lupine, orange | Lupinus citrinus | 1 | Not Listed | |
| Lupine, Panamint Mountains | Lupinus magnificus magnificus | 1 | Not Listed | |
| Lupine, Peirson's | Lupinus peirsonii | 1 | Not Listed | |
| Lupine, Quincy | Lupinus dalesiae | 1 | Not Listed | |
| Lupine, San Luis | Lupinus ludovicianus | 1 | Not Listed | |
| Lupine, Santa Lucia | Lupinus cervinus | 1 | Not Listed | |
| Lupine, scrub | Lupinus aridorum | 4 | E | |
| Lupine, shaggy-hair | Lupinus spectabilis | 1 | Not Listed | |
| Lupine, The Lassics | Lupinus constancei | 1 | Not Listed | |
| Lupine, Tracy's | Lupinus tracyi | 1 | Not Listed | |
| Lynx, Canada | Lynx canadensis | New Mexico population | 6 | C |
| Lynx, Canada | Lynx canadensis | U.S.A. (CO, ID, ME, MI, MN, MT, NH, NY, OR, UT, VT, WA, WI, WY) | 6 | T |
| Lynx, Spanish | Felis pardina | Entire | Foreign | E |
| Lysimachia, sp. nov. ined. | Lysimachia sp. | 1 | Not Listed | |
| Lysimachia, sp. nov. ined. (Waihoi Valley) | Lysimachia sp. nov. ined. | Waihoi Valley | 1 | Not Listed |
| Macaque, Formosan rock | Macaca cyclopis | Entire | Foreign | T |
| Macaque, Japanese | Macaca fuscata | Entire | Foreign | T |
| Macaque, lion-tailed | Macaca silenus | Entire | Foreign | E |
| Macaque, stump-tailed | Macaca arctoides | Entire | Foreign | T |
| Macaque, Toque | Macaca sinica | Entire | Foreign | T |
| Macaw, blue-headed | Primolius couloni | Entire | Foreign | Not Listed |
| Macaw, blue-throated | Ara glaucogularis | Entire | Foreign | UR |
| Macaw, glaucous | Anodorhynchus glaucus | Entire | Foreign | E |
| Macaw, great green | Ara ambiguus | Entire | Foreign | UR |
| Macaw, hyacinth | Anodorhynchus hyacinthinus | Entire | Foreign | UR |
| Macaw, indigo | Anodorhynchus leari | Entire | Foreign | E |
| Macaw, little blue | Cyanopsitta spixii | Entire | Foreign | E |
| Macaw, military | Ara militaris | Entire | Foreign | UR |
| Macaw, scarlet | Ara macao | Entire | Foreign | UR |
| Machaeranthera, Houston | Machaeranthera aurea | 2 | Not Listed | |
| Machearanthera, Welder | Machaeranthera heterocarpa | 2 | Not Listed | |
| Madia, Hall's | Madia hallii | 1 | Not Listed | |
| madia, Showy | madia radiata | 6 | Not Listed | |
| Madia, Stebbins' | Madia stebbinsii | 1 | Not Listed | |
| Madtom, Caddo | Noturus taylori | Entire | 4 | Not Listed |
| Madtom, Carolina | Noturus furiosus | Entire | 4 | Not Listed |
| Madtom, chucky | Noturus crypticus | Entire | 4 | E |
| Madtom, frecklebelly | Noturus munitus | Entire | 4 | Not Listed |
| Madtom, Neosho | Noturus placidus | Entire | 6 | T |
| Madtom, orangefin | Noturus gilberti | Entire | 5 | UR |
| Madtom, Ouachita | Noturus lachneri | Entire | 4 | Not Listed |
| Madtom, pygmy | Noturus stanauli | Entire | 4 | E |
| Madtom, pygmy | Noturus stanauli | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(t)(1)(i)) | 4 | EXPN |
| Madtom, saddled | Noturus sp. | saddled | 4 | Not Listed |
| Madtom, Scioto | Noturus trautmani | Entire | 3 | E |
| Madtom, smoky | Noturus baileyi | Entire | 4 | E |
| Madtom, smoky | Noturus baileyi | Tellico River, between the backwaters of the Tellico Reservoir and the Tellico Ranger Station, in Monroe County, Tennessee | 4 | EXPN |
| Madtom, spotted | Noturus insignis ssp. | Entire | 5 | Not Listed |
| Madtom, yellowfin | Noturus flavipinnis | Entire, except where listed as an experimental population below | 4 | T |
| Madtom, yellowfin | Noturus flavipinnis | N. Fork Holston R., VA, TN; S. Fork Holston R., upstream to Ft. Patrick Henry Dam, TN; Holston R., downstream to John Sevier Detention Lake Dam, TN; and all tributaries thereto | 4 | EXPN |
| Madtom, yellowfin | Noturus flavipinnis | Tellico River between the backwaters of the Tellico Reservoir and the Tellico Ranger Station, in Monroe County, Tennessee | 4 | EXPN |
| Madtom, yellowfin | Noturus flavipinnis | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(e)(1)(iii)) | 4 | EXPN |
| Magnolia, Ashe's | Magnolia ashei | 4 | Not Listed | |
| Magpie-robin, Seychelles (thrush) | Copsychus sechellarum | Entire | Foreign | E |
| Mahoe | Alectryon macrococcus | 1 | E | |
| Maidenbush, Trans-Pecos | Andrachne arida | 2 | Not Listed | |
| maiden fern, Boyds | Cyclosorus boydiae | 1 | C | |
| Makou | Botrychium subbifoliatum | 1 | Not Listed | |
| Makou | Brachionidium ciliolatum | 4 | Not Listed | |
| Makou | Peucedanum sandwicense | 1 | T | |
| Makou | Ranunculus hawaiensis | 1 | C | |
| Makou | Ranunculus mauiensis | 1 | C | |
| Malacothrix, Carmel Valley | Malacothrix saxatilis arachnoidea | 1 | Not Listed | |
| Malacothrix, island | Malacothrix squalida | 8 | E | |
| Malacothrix, Santa Cruz Island | Malacothrix indecora | 8 | E | |
| Malimbe, Ibadan | Malimbus ibadanensis | Entire | Foreign | E |
| Malkoha, red-faced (cuckoo) | Phaenicophaeus pyrrhocephalus | Entire | Foreign | E |
| Mallard, Mariana | Anas oustaleti | Entire | 1 | D3A |
| mallow, Gierisch | Sphaeralcea gierischii | 2 | C | |
| Mallow, Island tree | Lavatera assurgentiflora | 1 | Not Listed | |
| Mallow, Kern | Eremalche kernensis | 8 | E | |
| Mallow, Peter's Mountain | Iliamna corei | 5 | E | |
| Mallow, Virginia | Sida hermaphrodita | 5 | Not Listed | |
| Manaca, palma de | Calyptronoma rivalis | 4 | T | |
| Manatee, Amazonian | Trichechus inunguis | Entire | Foreign | E |
| Manatee, West African | Trichechus senegalensis | Entire | Foreign | T |
| Manatee, West Indian | Trichechus manatus | Entire | 4 | E |
| Mandrill | Mandrillus (=Papio) sphinx | Entire | Foreign | E |
| Manena | Melicope cinerea | 1 | Not Listed | |
| Mangabey, Tana River | Cercocebus galeritus galeritus | Entire | Foreign | E |
| Mangabey, white-collared | Cercocebus torquatus | Entire | Foreign | E |
| Manioc, Walker's | Manihot walkerae | 2 | E | |
| Manna grass, Smoky Mountains | Glyceria nubigena | 4 | Not Listed | |
| Manzanita, Arroyo de la Cruz | Arctostaphylos cruzensis | 1 | Not Listed | |
| Manzanita, Baker's | Arctostaphylos bakeri bakeri | 1 | Not Listed | |
| Manzanita, Bonny Doon | Arctostaphylos silvicola | 1 | Not Listed | |
| Manzanita, dacite | Arctostaphylos tomentosa daciticola | 1 | Not Listed | |
| Manzanita, Del Mar | Arctostaphylos glandulosa ssp. crassifolia | 8 | E | |
| Manzanita, Del Norte | Arctostaphylos nortensis | 1 | Not Listed | |
| Manzanita, Hearsts' | Arctostaphylos hookeri hearstiorum | 1 | Not Listed | |
| manzanita, Hooker's | arctostaphylos hookeri ssp. hookeri | 6 | Not Listed | |
| Manzanita, Ione | Arctostaphylos myrtifolia | 8 | T | |
| Manzanita, Kamchatka Point | Arctostaphylos uva-ursi suborbiculata | 1 | Not Listed | |
| Manzanita, Klamath | Arctostaphylos klamathensis | 1 | Not Listed | |
| Manzanita, Leo Brewer's | Arctostaphylos uva-ursi leobreweri | 1 | Not Listed | |
| Manzanita, Little Sur | Arctostaphylos edmundsii | 1 | Not Listed | |
| Manzanita, Marin | Arctostaphylos virgata | 1 | Not Listed | |
| Manzanita, Mono | Arctostaphylos uva-ursi monoensis | 1 | Not Listed | |
| Manzanita, Montara | Arctostaphylos montaraensis | 1 | Not Listed | |
| Manzanita, Monterrey | Arctostaphylos montereyensis | 1 | Not Listed | |
| Manzanita, Morro | Arctostaphylos morroensis | 8 | T | |
| Manzanita, Mt. Diablo | Arctostaphylos auriculata | 1 | Not Listed | |
| Manzanita, Nissenan | Arctostaphylos nissenana | 1 | Not Listed | |
| Manzanita, Oso | Arctostaphylos osoensis | 1 | Not Listed | |
| Manzanita, Otay | Arctostaphylos otayensis | 1 | Not Listed | |
| Manzanita, Pacific | Arctostaphylos pacifica | 1 | Not Listed | |
| Manzanita, Pajaroensis | Arctostaphylos pajaroensis | 1 | Not Listed | |
| Manzanita, pallid | Arctostaphylos pallida | 8 | T | |
| Manzanita, pecho | Arctostaphylos pechoensis | 1 | Not Listed | |
| Manzanita, Point Reyes | Arctostaphylos uva-ursi marinensis | 1 | Not Listed | |
| Manzanita, Presidio | Arctostaphylos hookeri var. ravenii | 8 | E | |
| Manzanita, Raiches | Arctostaphylos stanfordiana raichei | 1 | Not Listed | |
| manzanita, Rainbow | arctostaphylos rainbowensis | 6 | Not Listed | |
| Manzanita, Refugio | Arctostaphylos refugioensis | 1 | Not Listed | |
| Manzanita, San Bruno Mountain | Arctostaphylos imbricata | 1 | Not Listed | |
| Manzanita, sandmat | Arctostaphylos pumila | 1 | Not Listed | |
| Manzanita, sand mesa | Arctostaphylos rudis | 1 | Not Listed | |
| Manzanita, San Francisco | Arctostaphylos franciscana | 8 | PE | |
| Manzanita, San Gabriel | Arctostaphylos gabrielensis | 1 | Not Listed | |
| Manzanita, Santa Catalina Island | Arctostaphylos catalinae | 1 | Not Listed | |
| Manzanita, Santa Cruz | Arctostaphylos andersonii | 1 | Not Listed | |
| Manzanita, Santa Lucia | Arctostaphylos luciana | 1 | Not Listed | |
| Manzanita, Santa Margarita | Arctostaphylos pilosula pilosula | 1 | Not Listed | |
| Manzanita, Santa Rosa Island | Arctostaphylos confertiflora | 8 | E | |
| Manzanita, Schreiber's | Arabis oxylobula | 6 | Not Listed | |
| Manzanita, Schreiber's | Arctostaphylos glutinosa | 1 | Not Listed | |
| Manzanita, Tamalpais | Arctostaphylos hookeri montana | 1 | Not Listed | |
| Manzanita, [unnamed] | Arctostaphylos hispidula | 1 | Not Listed | |
| Manzanita, [unnamed] | Arctostaphylos intricata oblongifolia | 1 | Not Listed | |
| Manzanita, Vine Hill | Arctostaphylos densiflora | 1 | Not Listed | |
| Ma`o hau hele, (=native yellow hibiscus) | Hibiscus brackenridgei | 1 | E | |
| Ma`ohi`ohi | Stenogyne rugosa subulata | 1 | Not Listed | |
| Ma`oli`oli | Schiedea amplexicaulis | 1 | Not Listed | |
| Ma`oli`oli | Schiedea apokremnos | 1 | E | |
| Ma`oli`oli | Schiedea globosa foliosior | 1 | Not Listed | |
| Ma`oli`oli | Schiedea globosa globosa | 1 | Not Listed | |
| Ma`oli`oli | Schiedea globosa graminifolia | 1 | Not Listed | |
| Ma`oli`oli | Schiedea hawaiiensis | 1 | Not Listed | |
| Ma`oli`oli | Schiedea kealiae | 1 | E | |
| Ma`oli`oli | Schiedea ligustrina nematopoda | 1 | Not Listed | |
| Ma`oli`oli | Schiedea pubescens | 1 | C | |
| Ma`oloa | Neraudia melastomifolia | 1 | Not Listed | |
| Mapele | Cyrtandra cyaneoides | 1 | E | |
| Mapleleaf, winged | Quadrula fragosa | Entire; except where listed as experimental populations | 3 | E |
| Mapleleaf, winged | Quadrula fragosa | U.S.A. (AL; the free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale. See 17.85(a)) | 4 | EXPN |
| Maple, [unnamed] | Acer grandidentatum sinuosum | 2 | Not Listed | |
| Maraca | Canna pertusa | 4 | Not Listed | |
| Margay | Leopardus (=Felis) wiedii | Mexico southward | Foreign | E |
| Margay, Texas | Leopardus wiedii cooperi | Entire | 2 | Not Listed |
| Maricao cimarron | Byrsonima lucida | 4 | Not Listed | |
| Maricao cimarron | Byrsonima spicata | 4 | Not Listed | |
| Marina, California | Marina orcuttii orcuttii | 1 | Not Listed | |
| Mariposa lily | Calochortus simulans | 1 | Not Listed | |
| Mariposa lily | Calochortus venustus sanguineus | 1 | Not Listed | |
| Mariposa lily, alkali | Calochortus striatus | 1 | Not Listed | |
| Mariposa lily, Arroyo de la Cruz | Calochortus clavatus recurvifolius | 1 | Not Listed | |
| Mariposa lily, Cox's | Calochortus coxii | 1 | Not Listed | |
| Mariposa lily, Dunn's | Calochortus dunnii | 1 | Not Listed | |
| Mariposa lily, foothill | Calochortus weedii intermedius | 1 | Not Listed | |
| Mariposa lily, Greene's | Calochortus greenei | 1 | Not Listed | |
| Mariposa lily, Howell's | Calochortus howellii | 1 | Not Listed | |
| Mariposa lily, Inyo | Calochortus excavatus | 1 | Not Listed | |
| Mariposa lily, Munz's | Calochortus palmeri munzii | 1 | Not Listed | |
| Mariposa lily, Palmer's | Calochortus palmeri palmeri | 1 | Not Listed | |
| Mariposa lily, Pleasant Valley | Calochortus clavatus avius | 1 | Not Listed | |
| Mariposa lily, Plummer's | Calochortus plummerae | 1 | Not Listed | |
| Mariposa lily, Shasta River | Calochortus monanthus | 1 | Not Listed | |
| Mariposa lily, Shirley Meadows | Calochortus westonii | 1 | Not Listed | |
| Mariposa lily, Siskiyou | Calochortus persistens | 8 | C | |
| Mariposa lily, slender | Calochortus clavatus gracilis | 1 | Not Listed | |
| Mariposa lily, Tiburon | Calochortus tiburonensis | 8 | T | |
| Mariposa lily, [unnamed] | Calochortus indecorus | 1 | Not Listed | |
| Mariposa, long-bearded, Peck's | Calochortus longebarbatus peckii | 1 | Not Listed | |
| Mariposa, San Luis | Calochortus obispoensis | 1 | Not Listed | |
| Markhor | Capra falconeri | Entire | Foreign | UR |
| Markhor, chiltan (=wild goat) | Capra falconeri (=aegragrus) chiltanensis | Entire | Foreign | E |
| Markhor, Kabul | Capra falconeri megaceros | Entire | Foreign | E |
| Markhor, straight-horned | Capra falconeri jerdoni | Entire | Foreign | E |
| Markhor, straight-horned | Capra falconeri jerdoni | population of the Torghar Hills region of Balochistan Province, Pakistan | Foreign | UR |
| Marmoset, buff-headed | Callithrix flaviceps | Entire | Foreign | E |
| Marmoset, cotton-top | Saguinus oedipus | Entire | Foreign | E |
| Marmoset, Goeldi's | Callimico goeldii | Entire | Foreign | E |
| Marmoset, white-eared (=buffy tufted-ear) | Callithrix aurita (=jacchus a.) | Entire | Foreign | E |
| Marmot, Vancouver Island | Marmota vancouverensis | Entire | Foreign | E |
| Marmot, Wet Mountains yellow-bellied | Marmota flaviventris notioros | Entire | 6 | Not Listed |
| Marsh elder, San Diego | Iva hayesiana | 1 | Not Listed | |
| Marshsnail, Fish Springs | Stagnicola pilsbryi | Entire | 6 | Not Listed |
| Marstonia, beaver pond | Pyrgulopsis castor | Entire | 4 | Not Listed |
| Marstonia, Ocmulgee | Pyrgulopsis agarhecta | Entire | 4 | Not Listed |
| Marstonia, olive | Pyrgulopsis olivacea | Entire | 4 | Not Listed |
| Marstonia, royal (snail) | Pyrgulopsis ogmorhaphe | Entire | 4 | E |
| Marsupial, eastern jerboa | Antechinomys laniger | Entire | Foreign | E |
| Marsupial-mouse, large desert | Sminthopsis psammophila | Entire | Foreign | E |
| Marsupial-mouse, long-tailed | Sminthopsis longicaudata | Entire | Foreign | E |
| Marten, eastern | Martes americana americana | Entire | 5 | Not Listed |
| Marten, Formosan yellow-throated | Martes flavigula chrysospila | Entire | Foreign | E |
| martin, Purple | progne subis | Entire | 7 | Not Listed |
| Massasauga (=rattlesnake), eastern | Sistrurus catenatus | Entire | 3 | C |
| Mastiff-bat, Florida | Eumops glaucinus floridanus | Entire | 4 | Not Listed |
| Mastiff-bat, greater western | Eumops perotis californicus | Entire | 2 | Not Listed |
| Mastiff-bat, Underwood's | Eumops underwoodi | Entire | 2 | Not Listed |
| Matchweed, Bay | Gutierrezia californica | 1 | Not Listed | |
| Mato, amarillo | Caesalpinia culebrae | 4 | Not Listed | |
| Mato, braun | Caesalpinia portoricensis | 4 | Not Listed | |
| Mato, negro | Caesalpinia monensis | 4 | Not Listed | |
| Mayfly, American sandburrowing | Dolania americana | Entire | 4 | Not Listed |
| Mayfly, argo ephemerellan | Ephemerella argo | Entire | 3 | Not Listed |
| Mayfly, Berner's two-winged | Heterocleon berneri | Entire | 4 | Not Listed |
| Mayfly, Blackwater sandfiltering | Homoeoneuria dolani | Entire | 4 | Not Listed |
| Mayfly, burrowing | Hexagenia sp | Entire | NA | Not Listed |
| Mayfly, Cahaba sandfiltering | Homoeoneuria cahabensis | Entire | 4 | Not Listed |
| Mayfly, Colorado burrowing | Ephemera compar | Entire | 6 | Not Listed |
| Mayfly, diverse isonychian | Isonychia diversa | Entire | 4 | Not Listed |
| Mayfly, false ameletus | Ameletus falsus | Entire | 2 | Not Listed |
| Mayfly, Frison's seratellan | Seratella frisoni | Entire | 3 | Not Listed |
| Mayfly Konza Prairie | Leptophlebia konza | Entire | 6 | Not Listed |
| Mayfly, Meridion blackwater | Pseudirion meridionalis | Entire | 4 | Not Listed |
| Mayfly, Pecatonica River | Acanthometropus pecatonica | Entire | 3 | Not Listed |
| Mayfly, robust pentagenian burrowing | Pentagenia robusta | Entire | 3 | Not Listed |
| mayfly, Spiculose serratellan | Serratella serrata | Entire | 4 | Not Listed |
| Mayfly, Tomah | Siphlonisca aerodromia | Entire | 5 | Not Listed |
| Mayfly, [unnamed] | Paraleptophlebia calcarica | Entire | 4 | Not Listed |
| Mayfly, Wallace's deepwater | Spinadis wallacei | Entire | 3 | Not Listed |
| Mayfly, West Virginia burrowing | Ephemera triplex | Entire | 5 | Not Listed |
| Mayfly, yellow brachycercus | Brachycercus flavus | Entire | 4 | Not Listed |
| Meadowbeauty, awned | Rhexia aristosa | 4 | Not Listed | |
| Meadowbeauty, panhandle | Rhexia salicifolia | 4 | Not Listed | |
| Meadowbeauty, [unnamed] | Rhexia parviflora | 4 | Not Listed | |
| Meadowfoam, Baker's | Limnanthes bakeri | 1 | Not Listed | |
| Meadowfoam, Bellinger's | Limnanthes floccosa bellingeriana | 1 | Not Listed | |
| Meadowfoam, Butte County | Limnanthes floccosa ssp. californica | 8 | E | |
| Meadowfoam, dwarf | Limnanthes floccosa ssp. pumila | 1 | Not Listed | |
| Meadowfoam, large-flowered woolly | Limnanthes floccosa ssp. grandiflora | 1 | E | |
| Meadowfoam, Parish's | Limnanthes gracilis parishii | 1 | Not Listed | |
| Meadowfoam, Point Reyes | Limnanthes douglasii sulphurea | 1 | Not Listed | |
| Meadowfoam, Sebastopol | Limnanthes vinculans | 8 | E | |
| Meadowfoam, slender | Lasthenia macrantha prisca | 1 | Not Listed | |
| meadowfoam, slender | Limnanthes gracilis ssp. gracilis | 1 | Not Listed | |
| Meadowrue, Cooley's | Thalictrum cooleyi | 4 | E | |
| Meadowrue, Houston | Thalictrum texanum | 2 | Not Listed | |
| Meadow-rue, Piedmont | Thalictrum macrostylum | 4 | Not Listed | |
| Meadowrue, Steele's | Thalictrum steeleanum | 5 | Not Listed | |
| Mealybug, Oahu abutilon clavicoccus | Clavicoccus erinaceus | Entire | 1 | Not Listed |
| Mealybug, Oahu iliahi gall | Phyllococcus antricolens | Entire | 1 | Not Listed |
| Mealybug, Oahu ke`oke`o clavicoccus | Clavicoccus tribulus | Entire | 1 | Not Listed |
| Mealybug, Opuhe gall | Phyllococcus oahuensis | Entire | 1 | Not Listed |
| Megapode, Maleo | Macrocephalon maleo | Entire | Foreign | E |
| Megapode, Micronesian | Megapodius laperouse | Entire | 1 | E |
| megomphix, Oregon | megomphix hemphilli | entire | 1 | Not Listed |
| Mehamehame | Flueggea neowawraea | 1 | E | |
| Mercury, wild, Hill Country | Argythamnia aphoroides | 2 | Not Listed | |
| Mercury, wild, silvery | Argythamnia argyraea | 2 | Not Listed | |
| Merganser, Brazillian | Mergus octosetaceus | Entire | 9 | E |
| Merlin | falco columbarius | Entire | 7 | Not Listed |
| Merolonche, Doll's | Merolonche dolli | Entire | 5 | Not Listed |
| Mesa-mint, Otay | Pogogyne nudiuscula | 8 | E | |
| Mesa-mint, San Diego | Pogogyne abramsii | 8 | E | |
| Mescal bean, Guadalupe Mountains | Sophora gypsophila guadalupensis | 2 | Not Listed | |
| Meshweaver, Braken Bat Cave | Cicurina venii | Entire | 2 | E |
| Meshweaver, Government Canyon Bat Cave | Cicurina vespera | Entire | 2 | E |
| Meshweaver, Madla's Cave | Cicurina madla | Entire | 2 | E |
| Meshweaver, Robber Baron Cave | Cicurina baronia | Entire | 2 | E |
| Meshweaver, Warton cave | Cicurina wartoni | Entire | 2 | C |
| Micranthemum, Nuttall's | Micranthemum micranthemoides | 5 | Not Listed | |
| Micro caddisfly, Alsea ochrotrichian | Ochrotrichia alsea | Entire | 1 | Not Listed |
| Micro caddisfly, contorted ochrotrichian | Ochrotrichia contorta | Entire | 4 | Not Listed |
| Micro caddisfly, Deschutes ochrotrichian | Ochrotrichia phenosa | Entire | 1 | Not Listed |
| Micro caddisfly, Florida oxyethiran | Oxyethira florida | Entire | 4 | Not Listed |
| Micro caddisfly, Kite's neotrichian | Neotrichia kitae | Entire | 3 | Not Listed |
| Micro caddisfly, Knoxville hydroptilan | Hydroptila decia | Entire | 4 | Not Listed |
| Micro caddisfly, Page Spring | Metrichia volada | Entire | 2 | Not Listed |
| Micro caddisfly, Provost's ochrotrichian | Ochrotrichia provosti | Entire | 4 | Not Listed |
| Microcaddisfly, Susan's purse-making | Ochrotrichia susanae | Entire | 6 | Not Listed |
| Micro caddisfly, Vertrees's ochrotrichian | Ochrotrichia vertreesi | Entire | 1 | Not Listed |
| Microseris, Santa Cruz | Microseris decipiens | 1 | Not Listed | |
| microseris, Small-flowered | microseris douglasii ssp. platycarpha | 6 | Not Listed | |
| Milkpea, Small's | Galactia smallii | 4 | E | |
| Milkpea, [unnamed] | Galactia pinetorum | 4 | Not Listed | |
| milk-vetch, Alkali | Astragalus tener var. tener | 1 | Not Listed | |
| Milk-vetch, Applegate's | Astragalus applegatei | 8 | E | |
| Milk-vetch, Ash meadows | Astragalus phoenix | 8 | T | |
| Milk-vetch, Barneby | Astragalus barnebyi | 6 | Not Listed | |
| Milk-vetch, Bear Valley | Astragalus lentiginosus ursinus | 6 | Not Listed | |
| Milk-vetch, Beath | Astragalus beathii | 2 | Not Listed | |
| Milk-vetch, Beatley | Astragalus beatleyae | 1 | Not Listed | |
| Milk-vetch, Big Bear | Astragalus lentiginosus sierrae | 1 | Not Listed | |
| Milk-vetch, Braunton's | Astragalus brauntonii | 8 | E | |
| Milk-vetch, Calloway | Astragalus callithrix | 1 | Not Listed | |
| Milk-vetch, Castetter | Astragalus castetteri | 2 | Not Listed | |
| Milk-vetch, Clara Hunt's | Astragalus clarianus | 8 | E | |
| Milk-vetch, cliff | Astragalus cremnophylax myriorrhaphis | 2 | Not Listed | |
| Milk-vetch, cliff-palace | Astragalus deterior | 6 | Not Listed | |
| Milk-vetch, Coachella Valley | Astragalus lentiginosus var. coachellae | 8 | E | |
| Milk-vetch, coastal dunes | Astragalus tener var. titi | 8 | E | |
| Milk-vetch, Columbia | Astragalus columbianus | 1 | Not Listed | |
| Milk-vetch, coppermine | Astragalus cobrensis maguirei | 2 | Not Listed | |
| Milk-vetch, Cottam | Astragalus cottamii | 2 | Not Listed | |
| milk-vetch, Cotton's | Astragalus cottonii | 1 | Not Listed | |
| Milk-vetch, Cronquist | Astragalus cronquistii | 6 | Not Listed | |
| Milk-vetch, curve-podded Mojave | Astragalus mohavensis hemigyrus | 1 | Not Listed | |
| Milk-vetch, Cushenbury | Astragalus albens | 8 | E | |
| Milk-vetch, Deane's | Astragalus deanei | 1 | Not Listed | |
| milk-vetch, Debeque | Astragalus debequaeus | 6 | Not Listed | |
| Milk-vetch, debris | Astragalus detritalis | 6 | Not Listed | |
| Milk-vetch, Descanso | Astragalus oocarpus | 1 | Not Listed | |
| Milk-vetch, Deseret | Astragalus desereticus | 6 | T | |
| Milk-vetch, dinosaur | Astragalus saurinus | 6 | Not Listed | |
| Milk-vetch, Duchesne | Astragalus duchesnensis | 6 | Not Listed | |
| Milk-vetch, Ertter's | Astragalus ertterae | 1 | Not Listed | |
| Milk-vetch, escarpment | Astragalus striatiflorus | 6 | Not Listed | |
| milk-vetch, Ferris' | Astragalus tener var. ferrisae | 1 | Not Listed | |
| Milk-vetch, Fish Slough | Astragalus lentiginosus var. piscinensis | 8 | T | |
| Milk-vetch, gladiator | Astragalus xiphoides | 2 | Not Listed | |
| Milkvetch, Goose Creek | Astragalus anserinus | 6 | C | |
| Milk-vetch, Grand Junction | Astragalus linifolius | 6 | Not Listed | |
| Milk-vetch, grass | Astragalus chloodes | 6 | Not Listed | |
| Milk-vetch, gumbo | Astragalus ampullarius | 6 | Not Listed | |
| Milk-vetch, Gunnison | Astragalus anisus | 6 | Not Listed | |
| Milk-vetch, gypsum | Astragalus gypsodes | 2 | Not Listed | |
| Milk-vetch, Hamilton | Astragalus hamiltonii | 6 | Not Listed | |
| Milk-vetch, heliotrope | Astragalus montii | 6 | T | |
| Milk-vetch, Holmgren | Astragalus holmgreniorum | 6 | E | |
| Milk-vetch, horseshoe | Astragalus equisolensis | 6 | Not Listed | |
| Milk-vetch, Humboldt | Astragalus agnicidus | 1 | Not Listed | |
| Milk-vetch, Isely | Astragalus iselyi | 6 | UR | |
| Milk-vetch, Jacumba | Astragalus douglasii perstrictus | 1 | Not Listed | |
| Milk-vetch, Jaeger's bush | Astragalus pachypus jaegeri | 1 | Not Listed | |
| Milk-vetch, Jesup's | Astragalus robbinsii var. jesupi | 5 | E | |
| Milk-vetch, Kaiparowits | Astragalus malacoides | 6 | Not Listed | |
| Milk-vetch, Kerr's | Astragalus kerrii | 2 | Not Listed | |
| Milk-vetch, Lane Mountain | Astragalus jaegerianus | 8 | E | |
| Milk-vetch, Lavin's | Astragalus oophorus lavinii | 1 | Not Listed | |
| Milk-vetch, Long Valley | Astragalus johannis-howellii | 1 | Not Listed | |
| Milk-vetch, Mancos | Astragalus humillimus | 2 | E | |
| Milk-vetch, Mono | Astragalus monoensis monoensis | 1 | Not Listed | |
| Milk-vetch, Mulford's | Astragalus mulfordiae | 1 | Not Listed | |
| Milk-vetch, naturita | Astragalus naturitensis | 6 | Not Listed | |
| Milk-vetch, Nutriosa | Astragalus nutriosensis | 2 | Not Listed | |
| Milk-vetch, Osgood Mountains | Astragalus yoder-williamsii | 1 | UR | |
| Milk-vetch, Osterhout | Astragalus osterhoutii | 6 | E | |
| Milkvetch, Packard's | Astragalus cusickii var. packardiae | 1 | C | |
| Milk-vetch, pauper | Astragalus misellus pauper | 1 | Not Listed | |
| Milk-vetch, Peirson's | Astragalus magdalenae var. peirsonii | 8 | T | |
| Milk-vetch, Raven's | Astragalus monoensis ravenii | 1 | Not Listed | |
| Milk-vetch, Ripley | Astragalus ripleyi | 2 | Not Listed | |
| Milk-vetch, Robbins, | Astragalus robbinsii alpiniformis | 1 | Not Listed | |
| Milk-vetch, Robbins, | Astragalus robbinsii robbinsii | 5 | Not Listed | |
| Milk-vetch, Robbins, western ssp. | Astragalus robbinsii occidentalis | 1 | Not Listed | |
| Milk-vetch, Rydberg | Astragalus perianus | 6 | DO | |
| Milk-vetch, San Clemente Island | Astragalus nevinii | 1 | Not Listed | |
| Milk-vetch, sandhills | Astragalus michauxii | 4 | Not Listed | |
| Milk-vetch, San Pitch Valley | Astragalus lentiginosus chartaceus | 1 | Not Listed | |
| Milk-vetch, San Rafael | Astragalus rafaelensis | 6 | Not Listed | |
| Milk-vetch, Schmoll | Astragalus schmolliae | 6 | C | |
| Milk-vetch, Sentry | Astragalus cremnophylax var. cremnophylax | 2 | E | |
| Milk-vetch, Shevock's | Astragalus shevockii | 1 | Not Listed | |
| Milk-vetch, shining | Astragalus lentiginosus micans | 1 | Not Listed | |
| Milk-vetch, Shivwits | Astragalus ampullarioides | 6 | E | |
| Milkvetch, skiff | Astragalus microcymbus | 6 | C | |
| Milk-vetch, Sleeping Ute | Astragalus tortipes | 6 | C | |
| Milk-vetch, Sodaville | Astragalus lentiginosus sesquimetralis | 1 | Not Listed | |
| Milk-vetch, Spring Mountain | Astragalus remotus | 1 | Not Listed | |
| Milk-vetch, sterile | Astragalus sterilis | 1 | UR | |
| Milk-vetch, thistle, Douglas' | Astragalus kentrophyta douglasii | 1 | Not Listed | |
| Milk-vetch, Tiehm's | Astragalus tiehmii | 1 | Not Listed | |
| Milk-vetch, Tonopah | Astragalus iodanthus pseudoiodanthus | 1 | Not Listed | |
| Milk-vetch, Trask's | Astragalus traskiae | 1 | Not Listed | |
| Milk-vetch, triple-ribbed | Astragalus tricarinatus | 8 | E | |
| Milk-vetch, [unnamed] | Astragalus accumbens | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus ackermannii | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus aequalis | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus altus | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus alvordensis | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus amnis-amissi | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus atratus inseptus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus barrii | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus brandegei | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus calycosus monophyllidius | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus camptopus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus ceramicus apus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus cimae sufflatus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus consobrinus | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus convallarius finitimus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus drabelliformis | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus ensiformis | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus eurylobus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus gilmanii | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus harrisonii | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus henrimontanensis | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus hoodianus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus howellii | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus hypoxylus | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus knightii | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus lancearius | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus lentiformis | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus lentiginosus latus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus lentiginosus maricopae | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus lentiginosus pohlii | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus lentiginosus scorpionis | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus loanus | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus lutosus | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus minthorniae gracilior | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus molybdenus | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus monumentalis | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus neglectus | 3 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus nidularius | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus nyensis | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus oniciformis | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus oocalycis | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus panamintensis | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus pardalinus | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus pauperculus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus paysonii | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus peckii | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus porrectus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus preussii cutleri | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus proimanthus | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus proximus | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus pterocarpus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus puniceus gertrudis | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus purshii ophiogenes | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus sabulosus | 6 | UR | |
| Milk-vetch, [unnamed] | Astragalus scaphoides | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus serenoi sordescens | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus serpens | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus shultziorum | 6 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus siliceus | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus subvestitus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus tegetarioides | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus tennesseensis | 4 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus titanophilus | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus toquimanus | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus troglodytus | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus tweedyi | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus tyghensis | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus uncialis | 1 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus wittmannii | 2 | Not Listed | |
| Milk-vetch, [unnamed] | Astragalus woodruffii | 6 | Not Listed | |
| Milk-vetch, Ventura Marsh | Astragalus pycnostachyus var. lanosissimus | 8 | E | |
| Milk-vetch, weak | Astragalus solitarius | 1 | Not Listed | |
| Milk-vetch, Webber's | Astragalus webberi | 1 | Not Listed | |
| Milk-vetch, Wetherill | Astragalus wetherillii | 6 | Not Listed | |
| Milk-vetch, Whited | Astragalus sinuatus | 1 | Not Listed | |
| Milk-vetch, withered wooly | Astragalus mollissimus marcidus | 2 | Not Listed | |
| Milkvine, plateau | Matelea edwardsensis | 2 | Not Listed | |
| Milkvine, Texas | Matelea texensis | 2 | Not Listed | |
| Milkweed, Cutler | Asclepias cutleri | 2 | Not Listed | |
| Milkweed, Eastwood's | Asclepias eastwoodiana | 1 | Not Listed | |
| Milkweed, Mead's | Asclepias meadii | 3 | T | |
| Milkweed, Ruth | Asclepias ruthiae | 6 | Not Listed | |
| Milkweed, San Juan | Asclepias sanjuanensis | 2 | Not Listed | |
| Milkweed, [unnamed] | Asclepias prostrata | 2 | Not Listed | |
| Milkweed, [unnamed] | Asclepias uncialis | 6 | Not Listed | |
| Milkweed, [unnamed] | Asclepias viridula | 4 | Not Listed | |
| Milkweed, Welsh's | Asclepias welshii | 6 | T | |
| Milkwort, Fish's | Polygala cornuta var. fishiae | 8 | Not Listed | |
| Milkwort, Maravillas | Polygala maravillasensis | 2 | Not Listed | |
| Milkwort, Mescalero | Polygala rimulicola mescalerorum | 2 | Not Listed | |
| Millerbird, Nihoa (old world warbler) | Acrocephalus familiaris kingi | Entire | 1 | E |
| millipede, (Speodesmus) | speodesmus | 6 | Not Listed | |
| Millipede, [unnamed] | Toltecus chihuanus | 2 | Not Listed | |
| Mink, Everglades | Mustela vison evergladensis | Entire | 4 | Not Listed |
| Mink, Florida | Mustela vison lutensis | Entire | 4 | Not Listed |
| Minnow, cheat | Rhinichthys bowersi | Entire | 5 | Not Listed |
| Minnow, Devils River | Dionda diaboli | Entire | 2 | T |
| Minnow, Kanawha | Phenacobius teretulus | Entire | 5 | Not Listed |
| Minnow, loach | Tiaroga cobitis | Entire | 2 | T |
| Minnow, Plains | Hybognathus placitus | Entire | 6 | Not Listed |
| Minnow, Rio Grande silvery | Hybognathus amarus | Entire, except where listed as an experimental population | 2 | E |
| Minnow, Rio Grande silvery | Hybognathus amarus | Rio Grande, from Little Box Canyon (approximately 10.4 river miles downstream of Fort Quitman, TX) to Amistad Dam; and on the Pecos River, from its confluence with Independence Creek to its confluence with the Rio Grande. | 2 | EXPN |
| Minnow, western silvery | Hybognathus argyritis | Entire | 6 | Not Listed |
| Mint, Garrett's | Dicerandra christmanii | 4 | E | |
| Mint, Lakela's | Dicerandra immaculata | 4 | E | |
| Mint, longspurred | Dicerandra cornutissima | 4 | E | |
| Mint, scrub | Dicerandra frutescens | 4 | E | |
| Mint, [unnamed] | Dicerandra odoratissima | 4 | Not Listed | |
| Mint, [unnamed] | Dicerandra radfordiana | 4 | Not Listed | |
| Minute moss beetle, animas | Limnebius aridus | Entire | 2 | Not Listed |
| Minute moss beetle, Maureen's gymnocthebius | Gymnocthebius maureenae | Entire | 4 | Not Listed |
| Minute moss beetle, Maureen's hydraenan | Hydraena maureenae | Entire | 5 | Not Listed |
| Minute moss beetle, Putnam | Ochthebius putnamensis | Entire | 3 | Not Listed |
| Minute moss beetle, Texas | Limnebius texanus | Entire | 2 | Not Listed |
| Minute moss beetle, Utah | Limnebius utahensis | Entire | 6 | Not Listed |
| Minute moss beetle, Wilbur Springs | Ochthebius reticulus | Entire | 1 | Not Listed |
| Minute moss beetle, wing-shoulder | Ochthebius crassalus | Entire | 1 | Not Listed |
| Mission-bells, Diamond Lake | Fritillaria adamantina | 1 | Not Listed | |
| Mnium, Carolina | Mnium carolinianum | 4 | Not Listed | |
| Moccasinshell, Alabama | Medionidus acutissimus | Entire | 4 | T |
| Moccasinshell, Coosa | Medionidus parvulus | Entire | 4 | E |
| Moccasinshell, Gulf | Medionidus penicillatus | Entire | 4 | E |
| Moccasinshell, Ochlockonee | Medionidus simpsonianus | Entire | 4 | E |
| Moccasinshell, Suwanee | Medionidus walkeri | Entire | 4 | Not Listed |
| Mockingbird, Socorro | Mimus graysoni | Entire | Foreign | E |
| Mock orange, canyon | Philadelphus ernestii | 2 | Not Listed | |
| Mold beetle, Magazine Mountain | Arianops sandersoni | Entire | 4 | Not Listed |
| Mole, Alameda Island | Scapanus latimanus parvus | Entire | 1 | Not Listed |
| Mole, Anastasia Island | Scalopus aquaticus anastasae | Entire | 4 | Not Listed |
| Mole cricket, prairie | Gryllotalpa major | Entire | 3 | Not Listed |
| Mole, Englewood | Scalopus aquaticus bassi | Entire | 4 | Not Listed |
| Mole, Presidio | Scalopus aquaticus texanus | Entire | 2 | Not Listed |
| Mole, star-nosed | Condylura cristata parva | Entire | 4 | Not Listed |
| Monarch, Marquesan | Pomarea mendozae mira | Entire | Foreign | UR |
| Monarch, Tinian (old world flycatcher) | Monarcha takatsukasae | Entire | 1 | DM |
| Monarch, Truk | Metabolus rugensis | Entire | 1 | Not Listed |
| Monardella, crisp | Monardella crispa | 1 | Not Listed | |
| Monardella, Feather River | Monardella stebbinsii | 1 | Not Listed | |
| Monardella, flax-like | Monardella linoides oblonga | 1 | Not Listed | |
| Monardella, Hall's | Monardella macrantha hallii | 1 | Not Listed | |
| Monardella, Merced | Monardella leucocephala | 1 | Not Listed | |
| Monardella, Palmer's | Monardella palmeri | 1 | Not Listed | |
| Monardella, Pringle | Monardella pringlei | 1 | Not Listed | |
| Monardella, Robison's | Monardella robisonii | 1 | Not Listed | |
| monardella, Robust | monardella villosa ssp. globosa | 6 | Not Listed | |
| Monardella, rock | Monardella viridis saxicola | 1 | Not Listed | |
| Monardella, San Antonio Hills | Monardella antonina | 1 | Not Listed | |
| Monardella, San Benito | Monardella benitensis | 1 | Not Listed | |
| Monardella, San Felipe | Monardella nana leptosiphon | 1 | Not Listed | |
| Monardella, San Luis Obispo | Monardella fructescens | 1 | Not Listed | |
| Monardella, Siskiyou | Monardella purpurea | 1 | Not Listed | |
| Monardella, Stone Corral Canyon | Monardella scelerata | 1 | Not Listed | |
| Monardella, veiny | Monardella douglasii venosa | 1 | Not Listed | |
| Monardella, willowy | Monardella viminea | 8 | E | |
| Monitor, desert | Varanus griseus | Entire | Foreign | E |
| Monitor, Indian (=Bengal) | Varanus bengalensis | Entire | Foreign | E |
| Monitor, Komodo Island | Varanus komodoensis | Entire | Foreign | E |
| Monitor, yellow | Varanus flavescens | Entire | Foreign | E |
| Monkey, black colobus | Colobus satanas | Entire | Foreign | E |
| Monkey, black howler | Alouatta pigra | Entire | Foreign | T |
| Monkey, Diana | Cercopithecus diana | Entire | Foreign | E |
| Monkeyface, Appalachian (pearlymussel) | Quadrula sparsa | Entire | 5 | E |
| Monkeyface, Appalachian (pearlymussel) | Quadrula sparsa | USA (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Monkeyface, Cumberland (pearlymussel) | Quadrula intermedia | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Monkeyface, Cumberland (pearlymussel) | Quadrula intermedia | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Monkeyface, Cumberland (pearlymussel) | Quadrula intermedia | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Monkeyflower, bank | Mimulus clivicola | 1 | Not Listed | |
| Monkeyflower, calico | Mimulus pictus | 1 | Not Listed | |
| Monkeyflower, Cleveland's bush | Diplacus clevelandii | 8 | Not Listed | |
| Monkeyflower, Death Valley | Mimulus rupicola | 1 | Not Listed | |
| Monkey-flower, Egg Lake | Mimulus pygmaeus | 1 | Not Listed | |
| Monkey-flower, Hetch Hetchy | Mimulus filicaulis | 1 | Not Listed | |
| Monkeyflower, Kaweah | Mimulus norrisii | 1 | Not Listed | |
| Monkey-flower, Kelso Creek | Mimulus shevockii | 1 | Not Listed | |
| monkey-flower, Michigan | Mimulus michiganensis | 3 | E | |
| Monkey-flower, Mojave | Mimulus mohavensis | 1 | Not Listed | |
| monkeyflower, Palomar | mimulus diffusus | 6 | Not Listed | |
| Monkey-flower, purple | Mimulus purpureus purpureus | 1 | Not Listed | |
| Monkeyflower, Rocky Mountain | Mimulus gemmiparus | 6 | UR | |
| Monkey-flower, San Bernardino Mountains | Mimulus exiguus | 1 | Not Listed | |
| Monkey-flower, Santa Catalina | Mimulus traskiae | 1 | Not Listed | |
| Monkey-flower, Santa Cruz Island | Mimulus brandegei | 1 | Not Listed | |
| Monkey-flower, square-stemmed | Mimulus ringens colpophilus | 5 | Not Listed | |
| Monkey-flower, stalk-leaved | Mimulus patulus | 1 | Not Listed | |
| Monkeyflower, [unnamed] | Mimulus guttatus arenicola | 1 | Not Listed | |
| Monkeyflower, Vandenberg | Mimulus fremontii var. vandenbergensis | 8 | C | |
| Monkey-flower, Washington | Mimulus washingtonensis washingtonensis | 1 | Not Listed | |
| Monkey-flower, Whipple's | Mimulus whipplei | 1 | Not Listed | |
| Monkey, Guizhou snub-nosed | Rhinopithecus brelichi | Entire | Foreign | E |
| Monkey, L'hoest's | Cercopithecus lhoesti | Entire | Foreign | E |
| Monkey, mantled howler | Alouatta palliata | Entire | Foreign | E |
| Monkey, Preuss' red colobus | Procolobus (=Colobus) preussi (=badius p.) | Entire | Foreign | E |
| Monkey, proboscis | Nasalis larvatus | Entire | Foreign | E |
| Monkey, red-backed squirrel | Saimiri oerstedii | Entire | Foreign | E |
| Monkey, red-bellied | Cercopithecus erythrogaster | Entire | Foreign | E |
| Monkey, red-eared nose-spotted | Cercopithecus erythrotis | Entire | Foreign | E |
| Monkey, Sichuan snub-nosed | Rhinopithecus roxellana | Entire | Foreign | E |
| Monkey, spider | Ateles geoffroyi frontatus | Entire | Foreign | E |
| Monkey, spider | Ateles geoffroyl panamensis | Entire | Foreign | E |
| Monkey, Tana River red colobus | Procolobus (=Colobus) rufomitratus (=badius r.) | Entire | Foreign | E |
| Monkey, Tonkin snub-nosed | Rhinopithecus avunculus | Entire | Foreign | E |
| Monkey, woolly spider | Brachyteles arachnoides | Entire | Foreign | E |
| Monkey, yellow-tailed woolly | Lagothrix flavicauda | Entire | Foreign | E |
| Monkey, Yunnan snub-nosed | Rhinopithecus bieti | Entire | Foreign | E |
| Monkey, Zanzibar red colobus | Procolobus (=Colobus) pennantii (=kirki) kirki | Entire | Foreign | E |
| Monkshood, northern wild | Aconitum noveboracense | 3 | T | |
| Montia, Howell's | Montia howellii | 1 | Not Listed | |
| Moonwort, Prairie | Botrychium gallicomontanum | 3 | Not Listed | |
| Moonwort, slender | Botrychium lineare | 1 | Not Listed | |
| Moonwort, Stalked | Botrychium pedunculosum | 1 | Not Listed | |
| Moonwort, Trianglelobe | Botrychium ascendens | 1 | Not Listed | |
| Moorhen, Hawaiian common | Gallinula chloropus sandvicensis | Entire | 1 | E |
| Moorhen, Mariana common | Gallinula chloropus guami | Entire | 1 | E |
| Morning-glory, Butte County | Calystegia atriplicifolia buttensis | 1 | Not Listed | |
| Morning-glory, Cambria | Calystegia subacaulis episcopalis | 1 | Not Listed | |
| Morning-glory, island | Calystegia macrostegia amplissima | 1 | Not Listed | |
| Morning-glory, Krug's white | Ipomoea krugii | 4 | Not Listed | |
| Morning-glory, Lemmon's | Ipomoea tenuiloba lemmonii | 2 | Not Listed | |
| Morning-glory, Mt. Saint Helena | Calystegia collina oxyphylla | 1 | Not Listed | |
| Morning-glory, Peirson's | Calystegia peirsonii | 1 | Not Listed | |
| Morning-glory, Pickering's | Stylisma pickeringii | 5 | Not Listed | |
| Morning-glory, small-flowered | Convolvulus equitans | 8 | Not Listed | |
| Morning-glory, South Coast Range | Calystegia collina venusta | 1 | Not Listed | |
| Morning-glory, Stebbins' | Calystegia stebbinsii | 8 | E | |
| Morning-glory, [unnamed] | Ipomoea egregia | 2 | Not Listed | |
| Moss, American dry rock | Grimmia americana | 8 | Not Listed | |
| moss Cardot's campylium | Campylium cardotii | 6 | Not Listed | |
| moss, Dicranoweisia | dicranoweisia crispula | 6 | Not Listed | |
| Moss, gorge | Bryocrumia vivicolor | 4 | Not Listed | |
| Moss, highlands | Schlotheimia lancifolia | 4 | Not Listed | |
| moss Kansas aschisma | Aschisma kansanum | 6 | Not Listed | |
| moss, Menzies' anacolia | anacolia menziesii | 6 | Not Listed | |
| Moss, Mt. Leconte | Leptothymenium sharpii | 4 | Not Listed | |
| moss, Whipple's claopodium | claopodium whippleanum | 6 | Not Listed | |
| Moth, Blackburn's sphinx | Manduca blackburni | Entire | 1 | E |
| Moth, blue glyphodes | Glyphodes cyanomichla | Entire | 1 | Not Listed |
| Moth, chestnut clearwing | Synanthedon castaneae | Entire | 4 | Not Listed |
| Moth, confused helicoverpan noctuid | Helicoverpa confusa | Entire | 1 | Not Listed |
| Moth, decodon borer | Papaipema sulphurata | Entire | 5 | Not Listed |
| Moth, fabulous green sphinx | Tinostoma smaragditis | Entire | 1 | Not Listed |
| Moth, flypoison borer | Papaipema sp. | Entire | 5 | Not Listed |
| Moth fly, sugarfoot | Nemopalpus nearcticus | Entire | 4 | Not Listed |
| Moth, Ford's sand dune | Psammobotys fordi | Entire | 1 | Not Listed |
| Moth, Fullaway's banana omoides | Omoides fullawayi | Entire | 1 | Not Listed |
| Moth, Giffard's `ohe omoides | Omoides giffardi | Entire | 1 | Not Listed |
| Moth, green glyphodes | Glyphodes exaula | Entire | 1 | Not Listed |
| Moth, Haleakala flightless thyrocopa | Thyrocopa apatela | Entire | 1 | Not Listed |
| Moth, Hawaiian lo`ulu omoides | Omoides pritchardii | Entire | 1 | Not Listed |
| Moth, Henne's eucosman | Eucosma hennei | Entire | 1 | Not Listed |
| Moth, Hilo hypenan noctuid | Hypena newelli | Entire | 1 | Not Listed |
| Moth, Kaholuamano noctuid | Hypena senicula | Entire | 1 | Not Listed |
| Moth, Kauai naenae philodoria | Philodoria naenaeiella | Entire | 1 | Not Listed |
| Moth, Kern primrose sphinx | Euproserpinus euterpe | Entire | 8 | T |
| Moth, Kerr's agrotis noctuid | Agrotis kerri | Entire | 1 | Not Listed |
| Moth, Kilauea pa`iniu omoides | Omoides iridias | Entire | 1 | Not Listed |
| Moth, Kohala Mountain sedge omoides | Omoides anastreptoides | Entire | 1 | Not Listed |
| Moth, Laysan agrotis noctuid | Agrotis laysanensis | Entire | 1 | Not Listed |
| Moth, Laysan dropseed noctuid | Hypena laysanensis | Entire | 1 | Not Listed |
| Moth, Laysan hedyleptan | Hedylepta laysanensis | Entire | 1 | Not Listed |
| Moth, Lemmer's pinnion | Lithophane lemmeri | Entire | 5 | Not Listed |
| Moth, Lora Aborn's | Lorita abornana | Entire | 1 | Not Listed |
| Moth, lovegrass noctuid | Hypena plagiota | Entire | 1 | Not Listed |
| Moth, marbled underwing | Catocala marmorata | Entire | 4 | Not Listed |
| Moth, Maui banana omoides | Omoides musicola | Entire | 1 | Not Listed |
| Moth, Meyrick's banana omoides | Omoides meyricki | Entire | 1 | Not Listed |
| Moth, Midway agrotis noctuid | Agrotis fasciata | Entire | 1 | Not Listed |
| Moth, minute helicoverpan noctuid | Helicoverpa minuta | Entire | 1 | Not Listed |
| Moth, Molokai sedge omoides | Omoides anastrepta | Entire | 1 | Not Listed |
| Moth, Oahu aulu thyrocopa | Thyrocopa sapindiella | Entire | 1 | Not Listed |
| Moth, Oahu capper | Plutella capparidis | Entire | 1 | Not Listed |
| Moth, Oahu hesperonmannia philodoria | Philodoria sp. | Entire | 1 | Not Listed |
| Moth, Oahu swamp hedyleptan | Hedylepta epicentra | Entire | 1 | Not Listed |
| Moth, `Ohenaupaka oeobian | Oeobia dryadopa | Entire | 1 | Not Listed |
| Moth, `Ohe omoides | Omoides asaphombra | Entire | 1 | Not Listed |
| Moth, Okefenokee zale | Zale perculta | Entire | 4 | Not Listed |
| Moth, Ola`a banana omoides | Omoides euryprora | Entire | 1 | Not Listed |
| Moth, Oso Flaco flightless | Areniscythris brachypteris | Entire | 1 | Not Listed |
| Moth, 'Poko' noctuid | Agrotis crinigera | Entire | 1 | Not Listed |
| Moth, Procellaris agrotis noctuid | Agrotis procellaris | Entire | 1 | Not Listed |
| Moth, rattlesnake-master borer | Papaipema eryngii | Entire | 3 | Not Listed |
| Moth, San Francisco tree lupine | Grapholita edwardsiana | Entire | 1 | Not Listed |
| Moth, telegraphic hedyleptan | Hedylepta telegrapha | Entire | 1 | Not Listed |
| Mountain balm, Indian Knob | Eriodictyon altissimum | 8 | E | |
| Mountain beaver | Aplodontia rufa californica | Entire | 1 | Not Listed |
| Mountain beaver, Point Arena | Aplodontia rufa nigra | Entire | 8 | E |
| Mountain beaver, Point Reyes | Aplodontia rufa phaea | Entire | 1 | Not Listed |
| Mountain lion, California | Felis concolor californica | Entire | 1 | Not Listed |
| Mountain-mahogany, Catalina Island | Cercocarpus traskiae | 8 | E | |
| mountainmint, Torrey's | Pycnanthemum torrei | 4 | Not Listed | |
| Mountain-mint, [unnamed] | Pycnanthemum monotrichum | 5 | Not Listed | |
| Mountain parsley, purple | Oreonana purpurascens | 1 | Not Listed | |
| Mountainsnail Alpine | Oreohelix alpina | Entire | 6 | Not Listed |
| Mountainsnail, Berry's | Oreohelix strigosa berryi | Entire | 6 | Not Listed |
| Mountainsnail Bitterroot | Oreohelix amariradix | Entire | 6 | Not Listed |
| Mountainsnail, boulder pile | Oreohelix jugalis | Entire | 1 | Not Listed |
| Mountainsnail Brian Head | Oreohelix parawanensis | Entire | 6 | Not Listed |
| Mountainsnail, Byrne Resort | Oreohelix spthirtyone | Entire | 6 | Not Listed |
| Mountainsnail Carinate | Oreohelix elrodi | Entire | 6 | Not Listed |
| Mountainsnail, Carinated rocky | Oreohelix strigosa goniogyra | Entire | 1 | Not Listed |
| Mountainsnail, Catalina | Radiocentrum avalonensis | Entire | 1 | Not Listed |
| mountainsnail, Chelan | Oreohelix sp | Entire | 1 | UR |
| Mountainsnail, Coalville | Oreohelix peripherica weberiana | Entire | 6 | Not Listed |
| Mountainsnail, Cooper's rocky | Oreohelix strigosa cooperi | Entire | 6 | Not Listed |
| Mountainsnail Eureka | Oreohelix eurekensis | Entire | 6 | Not Listed |
| Mountainsnail, Eureka | Oreohelix eurekensis eurekensis | Entire | 6 | Not Listed |
| Mountainsnail, Florida | Oreohelix florida | Entire | 2 | Not Listed |
| Mountainsnail, Idaho banded | Oreohelix idahoensis idahoensis | Entire | 1 | Not Listed |
| Mountainsnail Keeled | Oreohelix carinifera | Entire | 6 | Not Listed |
| Mountainsnail, Lava rock | Oreohelix waltoni | Entire | 1 | Not Listed |
| Mountainsnail, Lyrate | Oreohelix haydeni haydeni | Entire | 6 | Not Listed |
| Mountainsnail Mill Creek | Oreohelix howardi | Entire | 6 | Not Listed |
| Mountainsnail, Mineral Creek | Oreohelix pilsbryi | Entire | 2 | Not Listed |
| Mountainsnail, Ogden | Oreohelix peripherica wasatchensis | Entire | 6 | Not Listed |
| Mountainsnail, Pahasapa | Oreohelix strigosa ssp. | Entire | 6 | Not Listed |
| Mountainsnail Pallid | Oreohelix hendersoni | Entire | 6 | Not Listed |
| Mountainsnail, Pinaleno | Oreohelix grahamensis | Entire | 2 | Not Listed |
| Mountainsnail Pygmy | Oreohelix pygmaea | Entire | 6 | Not Listed |
| Mountainsnail, Schell Creek | Oreohelix nevadensis | Entire | 1 | Not Listed |
| Mountainsnail, Uinta | Oreohelix eurekensis uinta | Entire | 6 | UR |
| Mountainsnail, [unnamed] | Oreohelix haydeni corugata | Entire | 6 | Not Listed |
| Mountainsnail, [unnamed] | Oreohelix parowanensis | Entire | 6 | Not Listed |
| Mountainsnail, whorled | Oreohelix vortex | Entire | 1 | Not Listed |
| Mountainsnail, Yavapai | Oreohelix yavapai | Entire | 6 | Not Listed |
| Mouse, Alabama beach | Peromyscus polionotus ammobates | Entire | 4 | E |
| Mouse, Anacapa deer | Peromyscus maniculatus anacapae | entire | 8 | Not Listed |
| Mouse, Anastasia Island beach | Peromyscus polionotus phasma | Entire | 4 | E |
| Mouse, Anastasia Island cotton | Peromyscus gossypinus anastasae | Entire | 4 | Not Listed |
| Mouse, Australian native | Notomys aquilo | Entire | Foreign | E |
| Mouse, Australian native | Zyzomys pedunculatus | Entire | Foreign | E |
| Mouse, Black Mountain cactus | Peromyscus eremicus pullus | Entire | 2 | Not Listed |
| Mouse, Black Mountain pocket | Perognathus intermedius nigrimontis | Entire | 2 | Not Listed |
| Mouse, Chadwick Beach cotton | Peromyscus gossypinus restrictus | Entire | 4 | Not Listed |
| Mouse, Chiricahua western harvest | Reithrodontomys megalotis arizonensis | Entire | 2 | Not Listed |
| Mouse, Choctawhatchee beach | Peromyscus polionotus allophrys | Entire | 4 | E |
| Mouse, Coconino Arizona pocket | Perognathus amplus ammodytes | Entire | 2 | Not Listed |
| Mouse, Desert Valley kangaroo | Microdipodops megacephalus albiventer | Entire | 1 | Not Listed |
| Mouse, Dulzura California pocket | Perognathus californicus femoralis | Entire | 1 | Not Listed |
| Mouse, Field's | Pseudomys fieldi | Entire | Foreign | E |
| Mouse, Fletcher dark kangaroo | Microdipodops megacephalus nasutus | Entire | 1 | Not Listed |
| Mouse, Florida | Peromyscus floridanus | Entire | 4 | Not Listed |
| Mouse, Gould's | Pseudomys gouldii | Entire | Foreign | E |
| Mouse, Jacumba little pocket | Perognathus longimembris internationalis | Entire | 1 | Not Listed |
| Mouse, Key Largo cotton | Peromyscus gossypinus allapaticola | Entire | 4 | E |
| Mouse, Los Angeles little pocket | Perognathus longimembris brevinasus | Entire | 1 | Not Listed |
| Mouse, Martha's Vineyard white-footed | Peromyscus leucopus fusus | Entire | 5 | Not Listed |
| Mouse, Monomoy white-footed | Peromyscus leucopus ammodytes | Entire | 5 | Not Listed |
| Mouse, New Holland | Pseudomys novaehollandiae | Entire | Foreign | E |
| Mouse, New Mexico meadow jumping | Zapus hudsonius luteus | Entire | 2 | C |
| mouse, Northwestern San Diego pocket | chaetodipus fallax | Entire | 1 | Not Listed |
| Mouse, Northwestern San Diego pocket | Perognathus fallax fallax | Entire | 1 | Not Listed |
| Mouse, Pacific pocket | Perognathus longimembris pacificus | Entire | 8 | E |
| Mouse, pallid oldfield beach | Peromyscus polionotus decoloratus | Entire | 4 | Not Listed |
| Mouse, Pallid San Diego pocket | Perognathus fallax pallidus | Entire | 1 | Not Listed |
| Mouse, Palm Springs little pocket | Perognathus longimembris bangsi | entire | 8 | Not Listed |
| Mouse, Palo Duro | Peromyscus truei comanche | Entire | 2 | Not Listed |
| Mouse, Perdido Key beach | Peromyscus polionotus trissyllepsis | Entire | 4 | E |
| Mouse, Pinacate cactus | Peromyscus eremicus papagensis | Entire | 2 | Not Listed |
| Mouse, Point Reyes jumping | Zapus trinotatus orarius | Entire | 1 | Not Listed |
| Mouse, Preble's meadow jumping | Zapus hudsonius preblei | U.S.A., north-central CO (that portion of Colorado west of 103 degrees 40 minutes West, north of 38 degrees 30 minutes North, and east of 105 degrees 50 minutes West). | 6 | T |
| Mouse, Pungo white-footed | Peromyscus leucopus easti | Entire | 5 | Not Listed |
| Mouse, Salinas pocket | Perognathus inornatus psammophilus | Entire | 1 | Not Listed |
| Mouse, salt marsh harvest | Reithrodontomys raviventris | Entire | 8 | E |
| Mouse, San Clemente deer | Peromyscus maniculatus clementis | Entire | 1 | Not Listed |
| Mouse, San Joaquin pocket | Perognathus inornatus | Entire | 1 | Not Listed |
| Mouse, San Joaquin pocket | Perognathus inornatus inornatus | Entire | 1 | Not Listed |
| Mouse, Santa Cruz harvest | Reithrodontomys megalotis santacruzae | Entire | 1 | Not Listed |
| Mouse, Santa Rosa beach | Peromyscus polionotus leucocephalus | Entire | 4 | Not Listed |
| Mouse, Shark Bay | Pseudomys praeconis | Entire | Foreign | E |
| Mouse, Shortridge's | Pseudomys shortridgei | Entire | Foreign | E |
| Mouse, silky pocket | Perognathus flavus goodpasteri | Entire | 2 | Not Listed |
| Mouse, smoky | Pseudomys fumeus | Entire | Foreign | E |
| Mouse, southeastern beach | Peromyscus polionotus niveiventris | Entire | 4 | T |
| Mouse, southern grasshopper | Onychomys torridus ramona | Entire | 1 | Not Listed |
| Mouse, southern marsh harvest | Reithrodontomys megalotis limicola | Entire | 1 | Not Listed |
| Mouse, St. Andrew beach | Peromyscus polionotus peninsularis | Entire | 4 | E |
| Mouse, Stansbury Island harvest | Reithrodontomys megalotis ravus | Entire | 6 | Not Listed |
| Mousetail, little | Myosurus minimus apus | 1 | Not Listed | |
| mousetail, tiny | Myosurus minimus | 1 | Not Listed | |
| Mouse, Tehachapi white-eared pocket | Perognathus alticola inexpectatus | Entire | 1 | Not Listed |
| Mouse, Tulare grasshopper | Onychomys torridus tularensis | Entire | 1 | Not Listed |
| Mouse, western | Pseudomys occidentalis | Entire | Foreign | E |
| Mouse, white-eared pocket | Perognathus alticola alticola | Entire | 1 | Not Listed |
| Mouse, Wupatki Arizona pocket | Perognathus amplus cineris | Entire | 2 | Not Listed |
| Mouse, Yavapai Arizona pocket | Perognathus amplus amplus | Entire | 2 | Not Listed |
| Mucket, Neosho | Lampsilis rafinesqueana | Entire | 4 | C |
| Mucket, orangenacre | Lampsilis perovalis | Entire | 4 | T |
| Mucket, pink (pearlymussel) | Lampsilis abrupta | Entire | 4 | E |
| Mucket, Salina | Disconaias salinasensis | Entire | 2 | Not Listed |
| Mudalia, black | Elimia melanoides | Entire | 4 | C |
| Mudalia, black | Leptoxis melanoidus | Entire | 4 | Not Listed |
| Mudalia, knob | Leptoxis minor | Entire | 4 | Not Listed |
| Mudminnow, Olympic | Novumbra hubbsi | Entire | 1 | Not Listed |
| Mudwort, Chiricahua | Limosella pubiflora | 2 | Not Listed | |
| muhly, California | Muhlenbergia californica | 1 | Not Listed | |
| Muhly, Torrey's | Muhlenbergia torreyana | 5 | Not Listed | |
| Muhly, [unnamed] | Muhlenbergia curtisetosa | 3 | Not Listed | |
| Muhly, villous | Muhlenbergia villosa | 2 | Not Listed | |
| Muilla, crowned | Muilla coronata | 1 | Not Listed | |
| Mule-ears, El Dorado | Wyethia reticulata | 1 | Not Listed | |
| Muntjac, Fea's | Muntiacus feae | Entire | Foreign | E |
| Munzothamnus, Blair's | Stephanomeria blairii | 1 | Not Listed | |
| Murrelet, Kittlitz's | Brachyramphus brevirostris | Entire | 7 | C |
| Murrelet, marbled | Brachyramphus marmoratus | Entire, except U.S.A. (CA, OR, WA) | 7 | Not Listed |
| Murrelet, marbled | Brachyramphus marmoratus | U.S.A. (CA, OR, WA) | 1 | T |
| Murrelet, Xantus's | Synthliboramphus hypoleucus | Entire | 8 | C |
| Murta | Marlierea sintenisii | 4 | Not Listed | |
| Mushroom, Indian Creek | Gloeocantharellus purpurascens | 4 | Not Listed | |
| Muskrat, Pecos River | Ondatra zibethicus ripensis | Entire | 2 | Not Listed |
| Muskrat, round-tailed | Neofiber alleni | Entire | 4 | Not Listed |
| Mussel, Lefevre's pearly | Epioblasma lefevrei | Entire | 3 | Not Listed |
| Mussel, oyster | Epioblasma capsaeformis | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Mussel, oyster | Epioblasma capsaeformis | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Mussel, oyster | Epioblasma capsaeformis | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Mussel, salamander | Simpsonaias ambigua | Entire | 5 | Not Listed |
| Mussel, scaleshell | Leptodea leptodon | Entire | 3 | E |
| Mussel, sheepnose | Plethobasus cyphyus | Entire | 3 | E |
| Mussel, snuffbox | Epioblasma triquetra | Entire | 3 | E |
| Mustard, Carter's | Warea carteri | 4 | E | |
| Mustard, Penland alpine fen | Eutrema penlandii | 6 | T | |
| Mustard, slender-petaled | Thelypodium stenopetalum | 8 | E | |
| myotis, California | myotis californicus | Entire | 8 | Not Listed |
| Myotis, cave | Myotis velifer | Entire | 2 | Not Listed |
| Myotis, fringed | Myotis thysanodes | Entire | 6 | Not Listed |
| Myotis, fringed-tailed | Myotis thysanodes pahasapensis | Entire | 6 | Not Listed |
| myotis, Keen's | myotis keenii | Entire | 7 | Not Listed |
| Myotis, long-eared | Myotis evotis | Entire | 6 | Not Listed |
| Myotis, long-legged | Myotis volans | Entire | 6 | Not Listed |
| Myotis, small-footed | Myotis ciliolabrum | Entire | 6 | Not Listed |
| Myotis, southeastern | Myotis austroriparius | Entire | 4 | Not Listed |
| Myotis, Yuma | Myotis yumanensis | Entire | 1 | Not Listed |
| Naenae | Dubautia kalalauensis | 1 | E | |
| Naenae | Dubautia kenwoodii | 1 | E | |
| Na`ena`e | Dubautia arborea | 1 | Not Listed | |
| Na`ena`e | Dubautia herbstobatae | 1 | E | |
| Na`ena`e | Dubautia imbricata imbricata | 1 | E | |
| Na`ena`e | Dubautia knudsenii filiformis | 1 | Not Listed | |
| Na`ena`e | Dubautia latifolia | 1 | E | |
| Na`ena`e | Dubautia microcephala | 1 | Not Listed | |
| Na`ena`e | Dubautia pauciflorula | 1 | E | |
| Na`ena`e | Dubautia plantaginea magnifolia | 1 | E | |
| Na`ena`e | Dubautia plantaginea ssp. humilis | 1 | E | |
| Na`ena`e | Dubautia struthioloides | 1 | Not Listed | |
| Na`ena`e | Dubautia waialealae | 1 | E | |
| Na`ena`e-pua-melemele | Dubautia laxa waianensis | 1 | Not Listed | |
| Naiad, Fish Lake | Najas caespitosa | 6 | Not Listed | |
| Nailwort, silvery | Paronychia virginica virginica | 5 | Not Listed | |
| Naio | Myoporum sandwicense stellatum | 1 | Not Listed | |
| nama, Nama | nama stenocarpum | 6 | Not Listed | |
| Nani wai`ale`ale | Viola kauaiensis var. wahiawaensis | 1 | E | |
| Nanu | Gardenia mannii | 1 | E | |
| Nanu | Gardenia remyi | 1 | C | |
| Native-cat, eastern | Dasyurus viverrinus | Entire | Foreign | E |
| Naucorid, Amargosa | Pelocoris shoshone amargosa | Entire | 1 | UR |
| Naucorid, Ash Meadows | Ambrysus amargosus | Entire | 8 | T |
| Naucorid bug (=Furnace Creek), Nevares Spring | Ambrysus funebris | Entire | 8 | C |
| Naupaka, dwarf | Scaevola coriacea | 1 | E | |
| Naupaka, Kilauea | Scaevola kilaueae | 1 | Not Listed | |
| Naupaka, mountain | Scaevola gaudichaudi | 1 | Not Listed | |
| navarretia, Adobe | navarretia nigelliformis ssp. nigelliformis | 6 | Not Listed | |
| Navarretia, few-flowered | Navarretia leucocephala ssp. pauciflora (=N. pauciflora) | 8 | E | |
| Navarretia, many-flowered | Navarretia leucocephala ssp. plieantha | 8 | E | |
| Navarretia, Piute Mountains | Navarretia setiloba | 1 | Not Listed | |
| Navarretia, spreading | Navarretia fossalis | 8 | T | |
| Navarretia, yellow-bur | Navarretia prolifera lutea | 1 | Not Listed | |
| Needlegrass, hairy Lemmon's | Stipa lemmonii pubescens | 1 | Not Listed | |
| Needlegrass, nodding | Nassella cernua | 1 | UR | |
| Nehe | Lipochaeta fauriei | 1 | E | |
| Nehe | Lipochaeta integrifolia gracilis | 1 | Not Listed | |
| Nehe | Lipochaeta integrifolia major | 1 | Not Listed | |
| Nehe | Lipochaeta integrifolia megacephala | 1 | Not Listed | |
| Nehe | Lipochaeta kamolensis | 1 | E | |
| Nehe | Lipochaeta lavarum longifolia | 1 | Not Listed | |
| Nehe | Lipochaeta lavarum salicifolia | 1 | Not Listed | |
| Nehe | Lipochaeta lavarum skottsbergii | 1 | Not Listed | |
| Nehe | Lipochaeta lobata lobata | 1 | Not Listed | |
| Nehe | Lipochaeta lobata var. leptophylla | 1 | E | |
| Nehe | Lipochaeta micrantha | 1 | E | |
| Nehe | Lipochaeta perdita | 1 | Not Listed | |
| Nehe | Lipochaeta populifolia | 1 | Not Listed | |
| Nehe | Lipochaeta profusa robustior | 1 | Not Listed | |
| Nehe | Lipochaeta subcordata membranacea | 1 | Not Listed | |
| Nehe | Lipochaeta succulenta succulenta | 1 | Not Listed | |
| Nehe | Lipochaeta tenuifolia | 1 | E | |
| Nehe | Lipochaeta tenuis | 1 | Not Listed | |
| Nehe | Lipochaeta waimeaensis | 1 | E | |
| Nehe, Bryan's | Lipochaeta bryanii | 1 | Not Listed | |
| Nehe, flexuous | Lipochaeta flexuosa | 1 | Not Listed | |
| Nehe kuhiwa | Phyllostegia mollis hochreutineri | 1 | Not Listed | |
| Nehe, many-flowered | Lipochaeta profusa profusa | 1 | Not Listed | |
| Nehe, Remy's | Lipochaeta remyi | 1 | Not Listed | |
| Nehe, Rock's | Lipochaeta rockii | 1 | Not Listed | |
| Nehe, small-leaved | Lipochaeta degeneri | 1 | Not Listed | |
| Nehe, [unnamed] | Lipochaeta alata alata | 1 | Not Listed | |
| Nekogigi (catfish) | Coreobagrus ichikawai | Entire | Foreign | E |
| Nemacladus, Twisselmann's | Nemacladus twisselmannii | 1 | Not Listed | |
| Nepticulid moth, American chestnut | Ectodemia castaneae | Entire | 5 | Not Listed |
| Nepticulid moth, phleophagan chestnut | Ectodemia phleophaga | Entire | 5 | Not Listed |
| Newt, black-spotted | Notophthalmus meridionalis | Entire | 2 | UR |
| newt, Coast range | taricha torosa ssp. torosa | Entire | 6 | Not Listed |
| newt, Rough-skinned | taricha granulosa | Entire | 7 | Not Listed |
| Newt, striped | Notophthalmus perstriatus | Entire | 4 | C |
| Night-blooming cereus, desert | Cereus greggii greggii | 2 | Not Listed | |
| nighthawk, Lesser | chordeiles acutipennis | Entire | 7 | Not Listed |
| Nightjar, Puerto Rican | Caprimulgus noctitherus | Entire | 4 | E |
| Nightshade, narrow-leaved | Solanum tenuilobatum | 1 | Not Listed | |
| Nightshade, [unnamed] | Solanum bahamense rugelii | 4 | Not Listed | |
| Nino de cota | Laplacea portoricensis | 4 | Not Listed | |
| Nioi | Eugenia koolauensis | 1 | E | |
| Niterwort, Amargosa | Nitrophila mohavensis | 8 | E | |
| No comment name | Elimia lachryma | Entire | 4 | Not Listed |
| No comment name | phytolacca sandwicensis | 1 | Not Listed | |
| No comment name | Pleurobema athearni | Entire | 4 | Not Listed |
| No common name | Abronia ammophila var. | 6 | Not Listed | |
| No common name | Abutilon eremitopetalum | 1 | E | |
| No common name | Abutilon parishii | 2 | Not Listed | |
| No common name | Abutilon sandwicense | 1 | E | |
| No common name | Abutilon virginianum | 4 | Not Listed | |
| No common name | Acarospora clauzadeana | 2 | Not Listed | |
| No common name | acarospora clauzadeana | 2 | Not Listed | |
| No common name | Achyranthes atollensis | 1 | Not Listed | |
| No common name | Achyranthes mutica | 1 | E | |
| No common name | Achyranthes splendens splendens | 1 | Not Listed | |
| No common name | Adiantum vivesii | 4 | E | |
| No common name | Aerva sericea | 1 | Not Listed | |
| No common name | afilia species | Entire | 2 | Not Listed |
| No common name | Agalinis purpurea carteri | 4 | Not Listed | |
| No common name | agapema galbina | Entire | 2 | Not Listed |
| No common name | Agastache cusickii | 1 | Not Listed | |
| No common name | agathon arizonicus | Entire | 2 | Not Listed |
| No common name | Agave eggersiana | 4 | C | |
| No common name | Agave mckelveyana | 2 | Not Listed | |
| No common name | Agave murpheyi | 2 | Not Listed | |
| No common name | Agave schottii treleasei | 2 | Not Listed | |
| No common name | Agave toumeyana bella | 2 | Not Listed | |
| No common name | Agave utahensis kaibabensis | 2 | Not Listed | |
| No common name | agylla septentrionalis | Entire | 2 | Not Listed |
| No common name | albiorix anophthalmus | Entire | 2 | Not Listed |
| No common name | Aletes filifolius | 2 | Not Listed | |
| No common name | Aletes humilis | 6 | Not Listed | |
| No common name | alexicles aspersa | Entire | 2 | Not Listed |
| No common name | Allionia cristata | 2 | Not Listed | |
| No common name | Allomyia hector | Entire | 6 | Not Listed |
| No common name | Allowissadula holosericea | 2 | Not Listed | |
| No common name | Alsinidendron obovatum | 1 | E | |
| No common name | Alsinidendron trinerve | 1 | E | |
| No common name | Alsinidendron viscosum | 1 | E | |
| No common name | Alsophila brooksii | 4 | Not Listed | |
| No common name | Amaranthus brownii | 1 | E | |
| No common name | Ameletus edmundsi | Entire | 6 | Not Listed |
| No common name | amergoniscus centalis | Entire | 2 | Not Listed |
| No common name | amergoniscus gipsocolus | Entire | 2 | Not Listed |
| No common name | Amorpha brachycarpa | 3 | Not Listed | |
| No common name | Amsonia fugatei | 2 | Not Listed | |
| No common name | Amsonia tabernaemontana gattingeri | 4 | Not Listed | |
| No common name | Angelica scabrida | 1 | Not Listed | |
| No common name | Angelica wheeleri | 6 | Not Listed | |
| No common name | Antennaria aromatica | 6 | Not Listed | |
| No common name | Antennaria soliceps | 1 | Not Listed | |
| No common name | Apacheria chiricahuensis | 2 | Not Listed | |
| No common name | apocheiridium reddelli | Entire | 2 | Not Listed |
| No common name | apodemia chisosensis | Entire | 2 | Not Listed |
| No common name | Aquilegia barnebyi | 6 | Not Listed | |
| No common name | Aquilegia caerulea daileyae | 6 | Not Listed | |
| No common name | Aquilegia desertorum | 2 | Not Listed | |
| No common name | Aquilegia saximontana | 6 | Not Listed | |
| No common name | Arabis missouriensis deamii | 3 | Not Listed | |
| No common name | Arabis suffrutescens horizontalis | 1 | Not Listed | |
| No common name | Arceuthobium apachense | 2 | Not Listed | |
| No common name | archeolarca welbourni | Entire | 2 | Not Listed |
| No common name | Arenaria franklinii thompsonii | 1 | Not Listed | |
| No common name | Arenaria kingii rosea | 1 | Not Listed | |
| No common name | Arenaria stenomeres | 1 | Not Listed | |
| No common name | Argemone arizonica | 2 | Not Listed | |
| No common name | Argemone glauca inermis | 1 | Not Listed | |
| No common name | arida mattturneri | 2 | Not Listed | |
| No common name | Aristida chaseae | 4 | E | |
| No common name | Armoracia lacustris | 3 | Not Listed | |
| No common name | Arnica amplexicaulis piperi | 1 | Not Listed | |
| No common name | Arnica chionopappa | 3 | Not Listed | |
| No common name | Arnica paniculata | 6 | Not Listed | |
| No common name | Arnica venosa | 1 | Not Listed | |
| No common name | Artemisia biennis diffusa | 6 | Not Listed | |
| No common name | Artemisia ludoviciana estesii | 1 | Not Listed | |
| No common name | Artemisia papposa | 1 | Not Listed | |
| No common name | Artemisia unalaskensis aleutica | 7 | Not Listed | |
| No common name | aspidoscelis arizonae | Entire | 2 | UR |
| No common name | Asplenium fragile var. insulare | 1 | E | |
| No common name | Asplenium schizophyllum | 1 | Not Listed | |
| No common name | Aster kingii barnebyana | 6 | Not Listed | |
| No common name | Astragalus amphioxys musimonum | 1 | Not Listed | |
| No common name | Astragalus collinus laurentii | 1 | Not Listed | |
| No common name | Astragalus diaphanus diurnus | 1 | Not Listed | |
| No common name | Astragalus geyeri triquetrus | 1 | Not Listed | |
| No common name | Astragalus gilviflora purpureus | 6 | Not Listed | |
| No common name | Astragalus jejunus articulatus | 6 | Not Listed | |
| No common name | Astragalus lentiginosus ambiguus | 2 | Not Listed | |
| No common name | Astragalus lentiginosus antonius | 1 | Not Listed | |
| No common name | Astragalus limnocharis limnocharis | 6 | Not Listed | |
| No common name | Astragalus limnocharis tabulaeus | 6 | Not Listed | |
| No common name | Astragalus oophorus lonchocalyx | 1 | Not Listed | |
| No common name | Astragalus pulsiferae suksdorfii | 1 | Not Listed | |
| No common name | Astragalus subcinereus basalticus | 6 | Not Listed | |
| No common name | Astragalus vexilliflexus nubilus | 1 | Not Listed | |
| No common name | Astranthium robustum | 2 | Not Listed | |
| No common name | astylis species | Entire | 2 | Not Listed |
| No common name | Athene cunicularia ssp. hypugaea | Entire | 1 | Not Listed |
| No common name | Atriplex canescens gigantea | 6 | Not Listed | |
| No common name | Atriplex welshii | 6 | Not Listed | |
| No common name | Auerodendron pauciflorum | 4 | E | |
| No common name | Aureolaria patula | 4 | Not Listed | |
| No common name | automeris patagoniensis | Entire | 2 | Not Listed |
| No common name | Bahia bigelovii | 2 | Not Listed | |
| No common name | Balduina atropurpurea | 4 | Not Listed | |
| No common name | Balsamorhiza rosea | 1 | Not Listed | |
| No common name | Balsamorhiza sericea | 1 | Not Listed | |
| No common name | Baptisia calycosa calycosa | 4 | Not Listed | |
| No common name | Baptisia simplicifolia | 4 | Not Listed | |
| No common name | Basiphyllaea angustifolia | 4 | Not Listed | |
| No common name | Bazzania nudicaulis | 4 | Not Listed | |
| No common name | Besseya bullii | 3 | Not Listed | |
| No common name | Blancosoma scaturgo | 6 | Not Listed | |
| No common name | Bonamia menziesii | 1 | E | |
| No common name | Bothriochloa exaristata | 2 | Not Listed | |
| No common name | Botrychium crenulatum | 1 | Not Listed | |
| No common name | Botrychium mormo | 3 | Not Listed | |
| No common name | Botrychium pallidum | 6 | Not Listed | |
| No common name | Botrychium paradoxum | 6 | Not Listed | |
| No common name | Brachycercus tuberculatus | Entire | 6 | Not Listed |
| No common name | Brassia caudata | 4 | Not Listed | |
| No common name | Braya humilis leiocarpa | 3 | Not Listed | |
| No common name | Brickellia dentata | 2 | Not Listed | |
| No common name | Brickellia leptophylla | 2 | Not Listed | |
| No common name | Bromus texensis | 2 | Not Listed | |
| No common name | Brunfelsia portoricensis | 4 | Not Listed | |
| No common name | Cacalia diversifolia | 4 | Not Listed | |
| No common name | Cacalia rugelia | 4 | Not Listed | |
| No common name | Caecidotea metcalfi | Entire | 6 | Not Listed |
| No common name | Caecidotea tridentata | Entire | 6 | Not Listed |
| No common name | Caesalpinia drummondii | 2 | Not Listed | |
| No common name | Calamintha ashei | 4 | Not Listed | |
| No common name | Calamintha dentata | 4 | Not Listed | |
| No common name | Calliandra locoensis | 4 | Not Listed | |
| No common name | Calochortus nitidus | 1 | Not Listed | |
| No common name | Calochortus weedii vestus | 1 | Not Listed | |
| No common name | Calyptranthes estremerae | 4 | Not Listed | |
| No common name | Calyptranthes luquillensis | 4 | Not Listed | |
| No common name | Calyptranthes peduncularis | 4 | Not Listed | |
| No common name | Calyptranthes thomasiana | 4 | E | |
| No common name | Calyptranthes triflorum | 4 | Not Listed | |
| No common name | Camassia cusickii | 1 | Not Listed | |
| No common name | Camassia howellii | 1 | Not Listed | |
| No common name | Camissonia atwoodi | 6 | Not Listed | |
| No common name | Campanula rotundifolia sacajaweana | 1 | Not Listed | |
| No common name | Capnia arapahoe | Entire | 6 | NS |
| No common name | Cardamine penduliflora | 1 | Not Listed | |
| No common name | carex mckittrickensis | 2 | Not Listed | |
| No common name | Carex wahuensis herbstii | 1 | Not Listed | |
| No common name | Cassia fasciculata macrosperma | 5 | Not Listed | |
| No common name | Castilleja annua | 7 | Not Listed | |
| No common name | Castilleja chrysantha | 1 | Not Listed | |
| No common name | Castilleja cruenta | 2 | Not Listed | |
| No common name | Castilleja fraterna | 1 | Not Listed | |
| No common name | Castilleja glandulifera | 1 | Not Listed | |
| No common name | Castilleja linoides | 1 | Not Listed | |
| No common name | Castilleja oresbia | 1 | Not Listed | |
| No common name | Castilleja parviflora olympica | 1 | Not Listed | |
| No common name | Castilleja rubida | 1 | Not Listed | |
| No common name | Castilleja xanthotricha | 1 | Not Listed | |
| No common name | catapyrenium granulosum | 2 | Not Listed | |
| No common name | Catesbaea melanocarpa | 4 | E | |
| No common name | Ceanothus arboreus glaber | 1 | Not Listed | |
| No common name | centaurium blumbergianum | 2 | Not Listed | |
| No common name | Cephaloziella obtusilobula | 4 | Not Listed | |
| No common name | Cereus greggii transmontanus | 2 | Not Listed | |
| No common name | ceuthothrombium cavaticum | Entire | 2 | Not Listed |
| No common name | Chaenactis cusickii | 1 | Not Listed | |
| No common name | Chaenactis evermannii | 1 | Not Listed | |
| No common name | Chaenactis nevii | 1 | Not Listed | |
| No common name | Chaenactis ramosa | 1 | Not Listed | |
| No common name | Chaenactis thompsonii | 1 | Not Listed | |
| No common name | Chaetopappa elegans | 2 | Not Listed | |
| No common name | Chamaechaenactis scaposa | 1 | Not Listed | |
| No common name | Chamaecrista glandulosa var. mirabilis | 4 | E | |
| No common name | Chamaerhodos nuttallii keweenawensis | 3 | Not Listed | |
| No common name | Chamaesyce celastroides stokesii | 1 | Not Listed | |
| No common name | Chamaesyce cumulicola | 4 | Not Listed | |
| No common name | Chamaesyce halemanui | 1 | E | |
| No common name | Chamaesyce multiformis multiformis | 1 | Not Listed | |
| No common name | Chamaesyce ocellata rattanii | 1 | Not Listed | |
| No common name | Chamaesyce porteriana porteriana | 4 | Not Listed | |
| No common name | Cheilolejeunea evansii | 4 | Not Listed | |
| No common name | cheiridium reyesi | Entire | 2 | Not Listed |
| No common name | Cheirodendron helleri helleri | 1 | Not Listed | |
| No common name | Cheirodendron helleri microcarpum | 1 | Not Listed | |
| No common name | Cheirodendron helleri sodalium | 1 | Not Listed | |
| No common name | Chelone obliqua speciosa | 4 | Not Listed | |
| No common name | Chenopodium oahuense discospermum | 1 | Not Listed | |
| No common name | Chiloscyphus gemmiparus | 6 | Not Listed | |
| No common name | chitrella elliotti | Entire | 2 | Not Listed |
| No common name | chitrella major | Entire | 2 | Not Listed |
| No common name | chitrella welbourni | Entire | 2 | Not Listed |
| No common name | chitrellina chiricahuae | Entire | 2 | Not Listed |
| No common name | Chorizanthe polygonoides longispina | 1 | Not Listed | |
| No common name | Chrysophyllum eggersii | 4 | Not Listed | |
| No common name | Chrysosplenium iowense | 3 | Not Listed | |
| No common name | Chrysothamnus eremobius | 1 | Not Listed | |
| No common name | Chrysothamnus molestus | 2 | Not Listed | |
| No common name | Chrysothamnus nauseosus nanus | 1 | Not Listed | |
| No common name | Chrysothamnus nauseosus texensis | 2 | Not Listed | |
| No common name | Chrysothamnus nauseosus var.iridus | 6 | Not Listed | |
| No common name | Chrysothamnus parryi hinckleyi | 2 | Not Listed | |
| No common name | cicurina barri | Entire | 2 | Not Listed |
| No common name | cicurina browni | Entire | 2 | Not Listed |
| No common name | cicurina caverna | Entire | 2 | Not Listed |
| No common name | cicurina coryelli | Entire | 2 | Not Listed |
| No common name | cicurina ezelli | Entire | 2 | Not Listed |
| No common name | cicurina gruta | Entire | 2 | Not Listed |
| No common name | cicurina holsingeri | Entire | 2 | Not Listed |
| No common name | cicurina machete | Entire | 2 | Not Listed |
| No common name | cicurina mckenziei | Entire | 2 | Not Listed |
| No common name | cicurina medina | Entire | 2 | Not Listed |
| No common name | cicurina menardia | Entire | 2 | Not Listed |
| No common name | cicurina obscura | Entire | 2 | Not Listed |
| No common name | cicurina orellia | Entire | 2 | Not Listed |
| No common name | cicurina pablo | Entire | 2 | Not Listed |
| No common name | cicurina pastura | Entire | 2 | Not Listed |
| No common name | cicurina patei | Entire | 2 | Not Listed |
| No common name | cicurina porteri | Entire | 2 | Not Listed |
| No common name | cicurina puentecilla | Entire | 2 | Not Listed |
| No common name | cicurina rainesi | Entire | 2 | Not Listed |
| No common name | cicurina reclusa | Entire | 2 | Not Listed |
| No common name | cicurina reddelli | Entire | 2 | Not Listed |
| No common name | cicurina reyesi | Entire | 2 | Not Listed |
| No common name | cicurina russelli | Entire | 2 | Not Listed |
| No common name | cicurina sansaba | Entire | 2 | Not Listed |
| No common name | cicurina selecta | Entire | 2 | Not Listed |
| No common name | cicurina serena | Entire | 2 | Not Listed |
| No common name | cicurina sheari | Entire | 2 | Not Listed |
| No common name | cicurina sprousei | Entire | 2 | Not Listed |
| No common name | cicurina stowersi | Entire | 2 | Not Listed |
| No common name | cicurina stowersi | Entire | 2 | Not Listed |
| No common name | cicurina suttoni | Entire | 2 | Not Listed |
| No common name | cicurina travisae | Entire | 2 | Not Listed |
| No common name | cicurina ubicki | Entire | 2 | Not Listed |
| No common name | cicurina uvalde | Entire | 2 | Not Listed |
| No common name | cicurina venefica | Entire | 2 | Not Listed |
| No common name | cicurina vibora | Entire | 2 | Not Listed |
| No common name | cicurina watersi | Entire | 2 | Not Listed |
| No common name | Cimicifuga laciniata | 1 | Not Listed | |
| No common name | Cimicifuga rubifolia | 4 | Not Listed | |
| No common name | cisthene conjuncta | Entire | 2 | Not Listed |
| No common name | Cladrastis kentukea | 4 | Not Listed | |
| No common name | Claytonia lanceolata chrysantha | 1 | Not Listed | |
| No common name | Claytonia lanceolata flava | 1 | Not Listed | |
| No common name | Claytonia megarhiza nivalis | 1 | Not Listed | |
| No common name | Cleomella montrosae | 6 | Not Listed | |
| No common name | Clermontia hawaiiensis hawaiiensis | 1 | Not Listed | |
| No common name | Clermontia konaensis | 1 | Not Listed | |
| No common name | Clermontia loyana | 1 | Not Listed | |
| No common name | Clermontia multiflora | 1 | Not Listed | |
| No common name | Clermontia munroi | 1 | Not Listed | |
| No common name | Clusia flava | 4 | Not Listed | |
| No common name | Coccoloba rugosa | 4 | Not Listed | |
| No common name | Cocculus integer | 1 | Not Listed | |
| No common name | Cocculus lonchophyllus | 1 | Not Listed | |
| No common name | Cocculus virgatus | 1 | Not Listed | |
| No common name | Coccyzus americanus ssp. occidentalis | Entire | 1 | Not Listed |
| No common name | Coelorachis tuberculosa | 4 | Not Listed | |
| No common name | Collinsia antonina | 1 | Not Listed | |
| No common name | Collomia renacta | 1 | Not Listed | |
| No common name | Conostegia hotteana | 4 | Not Listed | |
| No common name | Coprosma faurei lanaiensis | 1 | Not Listed | |
| No common name | Coprosma montana orbicularis | 1 | Not Listed | |
| No common name | Coprosma ochracea kaalae | 1 | Not Listed | |
| No common name | Coprosma pubens sessiliflora | 1 | Not Listed | |
| No common name | Coprosma serrata | 1 | Not Listed | |
| No common name | Cordia bellonis | 4 | E | |
| No common name | Cordia rupicola | 4 | C | |
| No common name | Cordia wagnerorum | 4 | Not Listed | |
| No common name | Coreopsis heterolepis | 4 | Not Listed | |
| No common name | Coreopsis latifolia | 4 | Not Listed | |
| No common name | Coreopsis pulchra | 4 | Not Listed | |
| No common name | Coreopsis tripteris subrhomboidea | 2 | Not Listed | |
| No common name | Corydalis aquae-gelidae | 1 | Not Listed | |
| No common name | Corydalis caseana brachycarpa | 6 | Not Listed | |
| No common name | Corydalis caseana hastata | 1 | Not Listed | |
| No common name | Coryphantha dasyacantha dasyacantha | 2 | Not Listed | |
| No common name | Coryphantha dasyacantha varicolor | 2 | Not Listed | |
| No common name | Coursetia axillaris | 2 | Not Listed | |
| No common name | Coursetia glabella | 2 | Not Listed | |
| No common name | Cranichis ricartii | 4 | E | |
| No common name | Crataegus stenosepala | 2 | Not Listed | |
| No common name | Crataegus sutherlandensis | 2 | Not Listed | |
| No common name | Crataegus triflora | 4 | Not Listed | |
| No common name | Crossosoma parviflorum | 2 | Not Listed | |
| No common name | Croton elliottii | 4 | Not Listed | |
| No common name | Croton fishlockii | 4 | Not Listed | |
| No common name | Croton glandulosus simpsonii | 4 | Not Listed | |
| No common name | Croton impressus | 4 | Not Listed | |
| No common name | Croton nummulariifolius | 4 | Not Listed | |
| No common name | Cryptantha cinerea arenicola | 6 | Not Listed | |
| No common name | Cryptantha creutzfeldtii | 6 | Not Listed | |
| No common name | Cryptantha hypsophila | 1 | Not Listed | |
| No common name | Cryptantha interrupta | 1 | Not Listed | |
| No common name | Cryptantha mensana | 6 | Not Listed | |
| No common name | Cryptantha paradoxa | 2 | Not Listed | |
| No common name | Cryptantha rollinsii | 6 | Not Listed | |
| No common name | Cryptantha subcapitata | 6 | Not Listed | |
| No common name | Cryptantha thompsonii | 1 | Not Listed | |
| No common name | Cryptocarya oahuensis | 1 | Not Listed | |
| No common name | Ctenium floridanum | 4 | Not Listed | |
| No common name | Cucurbita texana | 2 | Not Listed | |
| No common name | Cuphea aspera | 4 | Not Listed | |
| No common name | Cyanea angustifolia lanaiensis | 1 | Not Listed | |
| No common name | Cyanea angustifolia racemosa | 1 | Not Listed | |
| No common name | Cyanea arborea | 1 | Not Listed | |
| No common name | Cyanea aspleniifolia | 1 | Not Listed | |
| No common name | Cyanea chockii | 1 | Not Listed | |
| No common name | Cyanea comata | 1 | Not Listed | |
| No common name | Cyanea giffardii | 1 | Not Listed | |
| No common name | Cyanea grimesiana cylindrocalyx | 1 | Not Listed | |
| No common name | Cyanea linearifolia | 1 | Not Listed | |
| No common name | Cyanea pohaku | 1 | Not Listed | |
| No common name | Cyanea profuga | 1 | Not Listed | |
| No common name | Cyanea purpurellifolia | 1 | PE | |
| No common name | Cyanea pycnocarpa | 1 | Not Listed | |
| No common name | Cyanea quercifolia | 1 | Not Listed | |
| No common name | Cyanea (=Rollandia) crispa | 1 | E | |
| No common name | Cyanea scabra | 1 | Not Listed | |
| No common name | Cyclosorus boydiae boydiae | 1 | Not Listed | |
| No common name | Cyclosorus boydiae kipahuluensis | 1 | Not Listed | |
| No common name | Cymophyllus fraseri | 4 | Not Listed | |
| No common name | Cymopterus basalticus | 1 | Not Listed | |
| No common name | Cymopterus beckii | 6 | Not Listed | |
| No common name | Cymopterus corrugatus | 1 | Not Listed | |
| No common name | Cymopterus davisii | 1 | Not Listed | |
| No common name | Cymopterus douglassii | 1 | Not Listed | |
| No common name | Cymopterus everetii | 6 | Not Listed | |
| No common name | Cymopterus goodrichii | 1 | Not Listed | |
| No common name | Cymopterus ibapensis | 1 | Not Listed | |
| No common name | Cymopterus megacephalus | 2 | Not Listed | |
| No common name | Cymopterus newberryi | 2 | Not Listed | |
| No common name | Cymopterus nivalis | 1 | Not Listed | |
| No common name | Cymopterus ripleyi saniculoides | 1 | Not Listed | |
| No common name | Cymopterus rosei | 6 | Not Listed | |
| No common name | Cynanchum monense | 4 | Not Listed | |
| No common name | Cynanchum wigginsii | 2 | Not Listed | |
| No common name | Cyperus cephalanthus | 4 | Not Listed | |
| No common name | Cyperus granitophilus | 4 | Not Listed | |
| No common name | cyprinodon eremus | Entire | 2 | Not Listed |
| No common name | Cyrtandra alata | 1 | Not Listed | |
| No common name | Cyrtandra alnea | 1 | Not Listed | |
| No common name | Cyrtandra ambigua | 1 | Not Listed | |
| No common name | Cyrtandra axilliflora | 1 | Not Listed | |
| No common name | Cyrtandra basipartita | 1 | Not Listed | |
| No common name | Cyrtandra bryanii | 1 | Not Listed | |
| No common name | Cyrtandra carinata | 1 | Not Listed | |
| No common name | Cyrtandra caudatisepala | 1 | Not Listed | |
| No common name | Cyrtandra chartacea | 1 | Not Listed | |
| No common name | Cyrtandra christophersenii | 1 | Not Listed | |
| No common name | Cyrtandra collarifera | 1 | Not Listed | |
| No common name | Cyrtandra conradtii | 1 | Not Listed | |
| No common name | Cyrtandra cordifolia brevipilita | 1 | Not Listed | |
| No common name | Cyrtandra cordifolia gynoglabra | 1 | Not Listed | |
| No common name | Cyrtandra crassior | 1 | Not Listed | |
| No common name | Cyrtandra cupuliformis | 1 | Not Listed | |
| No common name | Cyrtandra ellipticifolia | 1 | Not Listed | |
| No common name | Cyrtandra elliptisepala | 1 | Not Listed | |
| No common name | Cyrtandra ferricolorata | 1 | Not Listed | |
| No common name | Cyrtandra ferruginosa | 1 | Not Listed | |
| No common name | Cyrtandra forbesii | 1 | Not Listed | |
| No common name | Cyrtandra fosbergii | 1 | Not Listed | |
| No common name | Cyrtandra garberi | 1 | Not Listed | |
| No common name | Cyrtandra georgiana | 1 | Not Listed | |
| No common name | Cyrtandra glauca | 1 | Not Listed | |
| No common name | Cyrtandra gracilis | 1 | PE | |
| No common name | Cyrtandra grayana lanaiensis | 1 | Not Listed | |
| No common name | Cyrtandra grossecrenata | 1 | Not Listed | |
| No common name | Cyrtandra hawaiensis | 1 | Not Listed | |
| No common name | Cyrtandra hirsutula | 1 | Not Listed | |
| No common name | Cyrtandra honolulensis | 1 | Not Listed | |
| No common name | Cyrtandra hosakae | 1 | Not Listed | |
| No common name | Cyrtandra intonsa | 1 | Not Listed | |
| No common name | Cyrtandra intrapilosa | 1 | Not Listed | |
| No common name | Cyrtandra kaalae | 1 | Not Listed | |
| No common name | Cyrtandra kahanensis | 1 | Not Listed | |
| No common name | Cyrtandra kahukuensis | 1 | Not Listed | |
| No common name | Cyrtandra kaluanuiensis | 1 | Not Listed | |
| No common name | Cyrtandra kaneoheensis | 1 | Not Listed | |
| No common name | Cyrtandra kohalae | 1 | Not Listed | |
| No common name | Cyrtandra koolauensis | 1 | Not Listed | |
| No common name | Cyrtandra laevis | 1 | Not Listed | |
| No common name | Cyrtandra laxiflora | 1 | Not Listed | |
| No common name | Cyrtandra lessoniana angustifolia | 1 | Not Listed | |
| No common name | Cyrtandra lessoniana intrapubens | 1 | Not Listed | |
| No common name | Cyrtandra longifolia longifolia | 1 | Not Listed | |
| No common name | Cyrtandra longiloba | 1 | Not Listed | |
| No common name | Cyrtandra lysiosepala grayi | 1 | Not Listed | |
| No common name | Cyrtandra lysiosepala haleakalensis | 1 | Not Listed | |
| No common name | Cyrtandra lysiosepala lysiosepala | 1 | Not Listed | |
| No common name | Cyrtandra malacophylla malacophylla | 1 | Not Listed | |
| No common name | Cyrtandra mannii | 1 | Not Listed | |
| No common name | Cyrtandra niuensis | 1 | Not Listed | |
| No common name | Cyrtandra nubincolens | 1 | Not Listed | |
| No common name | Cyrtandra olivacea | 1 | Not Listed | |
| No common name | Cyrtandra olona | 1 | Not Listed | |
| No common name | Cyrtandra paloloensis | 1 | Not Listed | |
| No common name | Cyrtandra paludosa haupuensis | 1 | Not Listed | |
| No common name | Cyrtandra partita | 1 | Not Listed | |
| No common name | Cyrtandra pearsallii | 1 | Not Listed | |
| No common name | Cyrtandra piligyna | 1 | Not Listed | |
| No common name | Cyrtandra platyphylla hiloensis | 1 | Not Listed | |
| No common name | Cyrtandra plurifolia | 1 | Not Listed | |
| No common name | Cyrtandra pubens | 1 | Not Listed | |
| No common name | Cyrtandra ramosissima | 1 | Not Listed | |
| No common name | Cyrtandra rockii | 1 | Not Listed | |
| No common name | Cyrtandra scabrella | 1 | Not Listed | |
| No common name | Cyrtandra skottsbergii | 1 | Not Listed | |
| No common name | Cyrtandra subcordata | 1 | Not Listed | |
| No common name | Cyrtandra subintegra | 1 | Not Listed | |
| No common name | Cyrtandra ternata | 1 | Not Listed | |
| No common name | Cyrtandra triflora | 1 | Not Listed | |
| No common name | Cyrtandra turbiniformis | 1 | Not Listed | |
| No common name | Cyrtandra vaniota | 1 | Not Listed | |
| No common name | Cyrtandra villicalyx pubentigyna | 1 | Not Listed | |
| No common name | Cyrtandra villosa | 1 | Not Listed | |
| No common name | Cyrtandra villosiflora | 1 | Not Listed | |
| No common name | Cyrtandra waiolani | 1 | PE | |
| No common name | Dalea gattingeri | 4 | Not Listed | |
| No common name | Daphnopsis hellerana | 4 | E | |
| No common name | Dasynotus daubenmirei | 1 | Not Listed | |
| No common name | Delissea fallax | 1 | Not Listed | |
| No common name | Delissea laciniata | 1 | Not Listed | |
| No common name | Delissea lauliiana | 1 | Not Listed | |
| No common name | Delissea parviflora | 1 | Not Listed | |
| No common name | Delissea rhytidosperma | 1 | E | |
| No common name | Delissea sinuata | 1 | Not Listed | |
| No common name | Delissea undulata | 1 | E | |
| No common name | Dendrographa leucophaea | 1 | Not Listed | |
| No common name | Dentaria incisa | 4 | Not Listed | |
| No common name | Descurainia torulosa | 6 | Not Listed | |
| No common name | Dicliptera krugii | 4 | Not Listed | |
| No common name | Diellia falcata | 1 | E | |
| No common name | Diellia mannii | 1 | E | |
| No common name | Diellia pallida | 1 | E | |
| No common name | Diellia unisora | 1 | E | |
| No common name | Digitaria floridana | 4 | Not Listed | |
| No common name | Digitaria gracillima | 4 | Not Listed | |
| No common name | Diplazium molokaiense | 1 | E | |
| No common name | Dissochondrus biflorus | 1 | Not Listed | |
| No common name | Ditaxis diversiflora | 1 | Not Listed | |
| No common name | Dodecatheon poeticum | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa confertior | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa costulata | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa forbesii | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa lanaiensis | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa molokaiensis | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa oblonga | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa pallida | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa skottsbergii | 1 | Not Listed | |
| No common name | Dodonaea eriocarpa varians | 1 | Not Listed | |
| No common name | Dodonaea sandwicensis latifolia | 1 | Not Listed | |
| No common name | Dodonaea sandwicensis simulans | 1 | Not Listed | |
| No common name | Dodonaea stenoptera fauriei | 1 | Not Listed | |
| No common name | Dodonaea stenoptera stenoptera | 1 | Not Listed | |
| No common name | Doryopteris angelica | 1 | E | |
| No common name | Doryopteris takeuchii | 1 | PE | |
| No common name | Douglasia idahoensis | 1 | Not Listed | |
| No common name | Douglasia laevigata laevigata | 1 | Not Listed | |
| No common name | Douglasia nivalis nivalis | 1 | Not Listed | |
| No common name | Draba apiculata daviesiae | 6 | Not Listed | |
| No common name | Draba aprica | 4 | Not Listed | |
| No common name | Draba argyraea | 1 | Not Listed | |
| No common name | Draba arida | 1 | Not Listed | |
| No common name | Draba asprella asprella | 2 | Not Listed | |
| No common name | Draba asprella kaibabensis | 2 | Not Listed | |
| No common name | Draba asprella stelligera | 2 | Not Listed | |
| No common name | Draba jaegeri | 1 | Not Listed | |
| No common name | Draba kassii | 6 | Not Listed | |
| No common name | Draba lemmonii cyclomorpha | 1 | Not Listed | |
| No common name | Draba maguirei burkei | 6 | Not Listed | |
| No common name | Draba maguirei maguirei | 6 | Not Listed | |
| No common name | Draba mogollonica | 2 | Not Listed | |
| No common name | Draba murrayi | 7 | Not Listed | |
| No common name | Draba oreibata serpentina | 1 | Not Listed | |
| No common name | Draba paucifructa | 1 | Not Listed | |
| No common name | Draba pectinipila | 6 | Not Listed | |
| No common name | Draba ruaxes | 7 | Not Listed | |
| No common name | Draba smithii | 6 | Not Listed | |
| No common name | Draba sphaeroides cusickii | 1 | Not Listed | |
| No common name | Draba yukonensis | 7 | Not Listed | |
| No common name | Dracontium polyphyllum | 4 | Not Listed | |
| No common name | Dryopteris glabra var. pusilla | 1 | Not Listed | |
| No common name | Dryopteris takeuchii | 1 | Not Listed | |
| No common name | Dubautia hillebrandii | 1 | Not Listed | |
| No common name | Dubautia knudsenii degeneri | 1 | Not Listed | |
| No common name | Dubautia laevigata parvifolia | 1 | Not Listed | |
| No common name | Dubautia laxa blakei | 1 | Not Listed | |
| No common name | Dubautia lonchophylla | 1 | Not Listed | |
| No common name | Dubautia magnifolia | 1 | Not Listed | |
| No common name | Dubautia molokaiensis | 1 | Not Listed | |
| No common name | Dubautia montana robustior | 1 | Not Listed | |
| No common name | Dubautia plantaginea acridentata | 1 | Not Listed | |
| No common name | Dubautia plantaginea plantaginea | 1 | Not Listed | |
| No common name | Dubautia platyphylla leptophylla | 1 | Not Listed | |
| No common name | Dubautia reticulata | 1 | Not Listed | |
| No common name | Dubautia rockii | 1 | Not Listed | |
| No common name | Dubautia ternifolia | 1 | Not Listed | |
| No common name | Dubautia thyrsiflora cernua | 1 | Not Listed | |
| No common name | Dubautia thyrsiflora thyrsiflora | 1 | Not Listed | |
| No common name | Dudleya saxosa collomiae | 2 | Not Listed | |
| No common name | Dyschoriste crenulata | 2 | Not Listed | |
| No common name | echeandia texensis | 2 | Not Listed | |
| No common name | Echinocereus ledingii | 2 | Not Listed | |
| No common name | Echinodorus parvulus | 6 | Not Listed | |
| No common name | Echinomastus erectocentrus erectocentrus | 2 | Not Listed | |
| No common name | Echinomastus warnockii | 2 | Not Listed | |
| No common name | eidmannella bullata | Entire | 2 | Not Listed |
| No common name | eidmannella delicata | Entire | 2 | Not Listed |
| No common name | eidmannella nasuta | Entire | 2 | Not Listed |
| No common name | eidmannella reclusa | Entire | 2 | Not Listed |
| No common name | Elaphoglossum serpens | 4 | E | |
| No common name | Eleocharis austrotexana | 2 | Not Listed | |
| No common name | Eleocharis wolfii | 3 | Not Listed | |
| No common name | Elymus svensonii | 4 | Not Listed | |
| No common name | Elytraria caroliniensis angustifolia | 4 | Not Listed | |
| No common name | Elytraria caroliniensis caroliniensis | 4 | Not Listed | |
| No common name | Embelia hillebrandii | 1 | Not Listed | |
| No common name | Encelia frutescens resinosa | 2 | Not Listed | |
| No common name | Encyclia kranzlinii | 4 | Not Listed | |
| No common name | Encyclia krugii | 4 | Not Listed | |
| No common name | Encyclia sintenisii | 4 | Not Listed | |
| No common name | Ephemerella apopsis | Entire | 6 | Not Listed |
| No common name | Epidendrum brittonianum | 4 | Not Listed | |
| No common name | Epidendrum lacerum | 4 | Not Listed | |
| No common name | Eragrostis deflexa | 1 | Not Listed | |
| No common name | Eragrostis hosakai | 1 | Not Listed | |
| No common name | Eragrostis paupera | 1 | Not Listed | |
| No common name | Erigeron arenarioides | 6 | Not Listed | |
| No common name | Erigeron arizonicus | 2 | Not Listed | |
| No common name | Erigeron bigelovii | 2 | Not Listed | |
| No common name | Erigeron canaanii | 6 | Not Listed | |
| No common name | Erigeron carringtonae | 6 | Not Listed | |
| No common name | Erigeron chrysopsidis brevifolius | 1 | Not Listed | |
| No common name | Erigeron flettii | 1 | Not Listed | |
| No common name | Erigeron garrettii | 6 | Not Listed | |
| No common name | Erigeron hultenii | 7 | Not Listed | |
| No common name | Erigeron lackshewitz | 6 | Not Listed | |
| No common name | Erigeron leibergii | 1 | Not Listed | |
| No common name | Erigeron lobatus | 2 | Not Listed | |
| No common name | Erigeron maguirei harrisonii | 6 | Not Listed | |
| No common name | Erigeron muirii | 7 | Not Listed | |
| No common name | Erigeron ovinus | 1 | Not Listed | |
| No common name | Erigeron perglaber | 2 | Not Listed | |
| No common name | Erigeron piperanus | 1 | Not Listed | |
| No common name | Erigeron pringlei | 2 | Not Listed | |
| No common name | Erigeron pulchellus tolsteadii | 3 | Not Listed | |
| No common name | Erigeron salmonensis | 1 | Not Listed | |
| No common name | Erigeron sionis | 6 | Not Listed | |
| No common name | Erigeron sivinskii | 2 | Not Listed | |
| No common name | Erigeron uncialis conjugans | 1 | Not Listed | |
| No common name | Erigeron untermannii | 6 | Not Listed | |
| No common name | Erigeron wilkenii | 6 | Not Listed | |
| No common name | Erigeron zothecinus | 6 | Not Listed | |
| No common name | Eriochloa michauxii simpsonii | 4 | Not Listed | |
| No common name | Eriogonum allenii | 5 | Not Listed | |
| No common name | Eriogonum concinnum | 1 | Not Listed | |
| No common name | Eriogonum correllii | 2 | Not Listed | |
| No common name | Eriogonum densum | 2 | Not Listed | |
| No common name | Eriogonum grayi | 6 | Not Listed | |
| No common name | Eriogonum heermannii subracemosum | 2 | Not Listed | |
| No common name | Eriogonum lagopus | 6 | Not Listed | |
| No common name | Eriogonum latens | 1 | Not Listed | |
| No common name | Eriogonum lewisii | 1 | Not Listed | |
| No common name | Eriogonum lobbii robustum | 1 | Not Listed | |
| No common name | Eriogonum longifolium harperi | 4 | Not Listed | |
| No common name | Eriogonum natum | 6 | Not Listed | |
| No common name | Eriogonum novonudum | 1 | Not Listed | |
| No common name | Eriogonum nummulare | 6 | Not Listed | |
| No common name | Eriogonum ovalifolium caelestinum | 1 | Not Listed | |
| No common name | Eriogonum rubricaule | 1 | Not Listed | |
| No common name | Eriogonum scopulorum | 1 | Not Listed | |
| No common name | eriogonum terrenatum | 2 | Not Listed | |
| No common name | Eriogonum thymoides | 1 | Not Listed | |
| No common name | Eriogonum tumulosum | 6 | Not Listed | |
| No common name | Eriogonum umbellatum hypoleium | 1 | Not Listed | |
| No common name | Eriogonum viridulum | 6 | Not Listed | |
| No common name | Eriogonum visheri | 6 | Not Listed | |
| No common name | Erithalis revoluta | 4 | Not Listed | |
| No common name | Errazurizia rotundata | 2 | Not Listed | |
| No common name | Erythronium cliftonii | 1 | Not Listed | |
| No common name | Erythronium elegans | 1 | Not Listed | |
| No common name | Erythronium grandiflorum nudipetalum | 1 | Not Listed | |
| No common name | Erythronium helenae | 1 | Not Listed | |
| No common name | Erythronium oregonum | 1 | Not Listed | |
| No common name | Eschscholzia multiflora twisselmannii | 1 | Not Listed | |
| No common name | Eugenia bellonis | 4 | Not Listed | |
| No common name | Eugenia margarettae | 4 | Not Listed | |
| No common name | Eugenia underwoodii | 4 | Not Listed | |
| No common name | Eugenia woodburyana | 4 | E | |
| No common name | euhyparpax rosea | Entire | 2 | Not Listed |
| No common name | Eupatorium borinquense | 4 | Not Listed | |
| No common name | Eupatorium luciae-brauniae | 4 | Not Listed | |
| No common name | Eupatorium oteroi | 4 | Not Listed | |
| No common name | Eupatorium saltuense | 4 | Not Listed | |
| No common name | Euphorbia austrina | 4 | Not Listed | |
| No common name | Euphorbia celastroides halawana | 1 | Not Listed | |
| No common name | Euphorbia celastroides haupuana | 1 | Not Listed | |
| No common name | Euphorbia celastroides humbertii | 1 | Not Listed | |
| No common name | Euphorbia celastroides kohalana | 1 | Not Listed | |
| No common name | Euphorbia celastroides nelsonii | 1 | Not Listed | |
| No common name | Euphorbia celastroides nematopoda | 1 | Not Listed | |
| No common name | Euphorbia celastroides saxicola | 1 | Not Listed | |
| No common name | Euphorbia celastroides waikoluensis | 1 | Not Listed | |
| No common name | Euphorbia degeneri molokaiensis | 1 | Not Listed | |
| No common name | Euphorbia discoidalis | 4 | Not Listed | |
| No common name | Euphorbia exserta | 4 | Not Listed | |
| No common name | Euphorbia innocua | 2 | Not Listed | |
| No common name | Euphorbia jejuna | 2 | Not Listed | |
| No common name | Euphorbia plummerae | 2 | Not Listed | |
| No common name | Euphorbia roemeriana | 2 | Not Listed | |
| No common name | Euphorbia strictior | 2 | Not Listed | |
| No common name | Eurhychium pringlei | 4 | Not Listed | |
| No common name | Eurya sandwicensis | 1 | Not Listed | |
| No common name | eurycea species | Entire | 2 | Not Listed |
| No common name | eurycea species | Entire | 2 | Not Listed |
| No common name | eurycea species | Entire | 2 | Not Listed |
| No common name | eurycea specieseight | Entire | 2 | UR |
| No common name | eurycea speciesten | Entire | 2 | UR |
| No common name | Eurytaenia hinckleyi | 2 | Not Listed | |
| No common name | Exocarpos gaudichaudii | 1 | Not Listed | |
| No common name | Ferocactus eastwoodiae | 2 | Not Listed | |
| No common name | Festuca hallii | 6 | Not Listed | |
| No common name | Festuca hawaiiensis | 1 | C | |
| No common name | Fimbristylis hawaiiensis | 1 | Not Listed | |
| No common name | Flaveria mcdougallii | 2 | Not Listed | |
| No common name | Flyriella parryi | 2 | Not Listed | |
| No common name | Forchhammeria polyandra | 4 | Not Listed | |
| No common name | Forestiera segregata pinetorum | 4 | Not Listed | |
| No common name | Frasera coloradensis | 6 | Not Listed | |
| No common name | Frasera idahoensis | 1 | Not Listed | |
| No common name | Frasera puberulenta | 1 | Not Listed | |
| No common name | Frasera tubulosa | 1 | Not Listed | |
| No common name | Gahnia lanaiensis | 1 | E | |
| No common name | Galactia eggersii | 4 | Not Listed | |
| No common name | Galinsoga semicalva percalva | 2 | Not Listed | |
| No common name | Gardenia weissichii | 1 | Not Listed | |
| No common name | Gaura demareei | 4 | Not Listed | |
| No common name | Gentiana austromontana | 4 | Not Listed | |
| No common name | Gentianella propinqua aleutica | 7 | Not Listed | |
| No common name | Gentianella wislizenii | 2 | Not Listed | |
| No common name | Geocarpon minimum | 4 | T | |
| No common name | geomys streckeri | Entire | 2 | Not Listed |
| No common name | Gesneria pauciflora | 4 | T | |
| No common name | Gilia mcvickerae | 6 | Not Listed | |
| No common name | Gilia nyensis | 1 | Not Listed | |
| No common name | Gilia pentstemonoides | 6 | Not Listed | |
| No common name | Gilia ripleyi | 1 | Not Listed | |
| No common name | Gilia tenuis | 6 | UR | |
| No common name | Gnaphalium macounii | 3 | Not Listed | |
| No common name | Gonocalyx concolor | 4 | C | |
| No common name | Gouania hillebrandii | 1 | E | |
| No common name | Gouania meyenii | 1 | E | |
| No common name | Gouania vitifolia | 1 | E | |
| No common name | Gouldia st-johnii munroi | 1 | Not Listed | |
| No common name | Gouldia terminalis bobeoides | 1 | Not Listed | |
| No common name | Gouldia terminalis congesta | 1 | Not Listed | |
| No common name | Gouldia terminalis crassicaulis | 1 | Not Listed | |
| No common name | Gouldia terminalis degeneri | 1 | Not Listed | |
| No common name | Gouldia terminalis lanai | 1 | Not Listed | |
| No common name | Gouldia terminalis parvifolia | 1 | Not Listed | |
| No common name | Gouldia terminalis pseudodichotoma | 1 | Not Listed | |
| No common name | Gouldia terminalis pubescens | 1 | Not Listed | |
| No common name | Gouldia terminalis quadrangularis | 1 | Not Listed | |
| No common name | Gouldia terminalis rotundifolia | 1 | Not Listed | |
| No common name | Gouldia terminalis subcordata | 1 | Not Listed | |
| No common name | Graptopetalum rusbyi | 2 | Not Listed | |
| No common name | Greenella discoidea | 2 | Not Listed | |
| No common name | Gunnera kaalensis | 1 | Not Listed | |
| No common name | Gunnera makahaensis | 1 | Not Listed | |
| No common name | Gutierrezia linoides | 2 | Not Listed | |
| No common name | Gutierrezia petradoria | 6 | Not Listed | |
| No common name | Gutierrezia sarothrae pomariensis | 6 | Not Listed | |
| No common name | Gymnocarpium heterosporum | 3 | Not Listed | |
| No common name | Gymnopogon floridanus | 4 | Not Listed | |
| No common name | Habenaria zothecina | 6 | Not Listed | |
| No common name | Hackelia hispida | 1 | Not Listed | |
| No common name | Halimolobos perplexa lemhiensis | 1 | Not Listed | |
| No common name | Halimolobos perplexa perplexa | 1 | Not Listed | |
| No common name | Haplopappus aberrans | 1 | Not Listed | |
| No common name | Haplopappus alpinus | 1 | Not Listed | |
| No common name | Haplopappus carthamoides subsquarrosus | 6 | Not Listed | |
| No common name | Haplopappus cervinus | 1 | Not Listed | |
| No common name | Haplopappus crispus | 6 | Not Listed | |
| No common name | Haplopappus graniticus | 1 | Not Listed | |
| No common name | Haplopappus hallii | 1 | Not Listed | |
| No common name | Haplopappus insecticruris | 1 | Not Listed | |
| No common name | Haplopappus liatriformis | 1 | Not Listed | |
| No common name | Haplopappus racemosus congestus | 1 | Not Listed | |
| No common name | Haplopappus scopulorum | 2 | Not Listed | |
| No common name | Haplopappus spinulosus laevis | 2 | Not Listed | |
| No common name | Haplopappus watsonii | 1 | Not Listed | |
| No common name | Haplopappus zionis | 6 | Not Listed | |
| No common name | Haplostachys bryanii | 1 | Not Listed | |
| No common name | Haplostachys linearifolia | 1 | Not Listed | |
| No common name | Haplostachys munroi | 1 | Not Listed | |
| No common name | Haplostachys truncata | 1 | Not Listed | |
| No common name | Hastingsia atropurpurea | 1 | Not Listed | |
| No common name | Hastingsia bracteosa | 1 | Not Listed | |
| No common name | Hazardia brickellioides | 1 | Not Listed | |
| No common name | Hechtia texensis | 2 | Not Listed | |
| No common name | Hedeoma dentatum | 2 | Not Listed | |
| No common name | Hedeoma molle | 2 | Not Listed | |
| No common name | Hedeoma nanum californicum | 1 | Not Listed | |
| No common name | Hedeoma pulcherrimum | 2 | Not Listed | |
| No common name | Hedyotis angusta angusta | 1 | Not Listed | |
| No common name | Hedyotis degeneri | 1 | E | |
| No common name | Hedyotis elatior | 1 | Not Listed | |
| No common name | Hedyotis foliosa | 1 | Not Listed | |
| No common name | Hedyotis formosa | 1 | Not Listed | |
| No common name | Hedyotis glaucifolia helleri | 1 | Not Listed | |
| No common name | Hedyotis littoralis | 1 | Not Listed | |
| No common name | Hedyotis parvula | 1 | E | |
| No common name | Hedyotis remyi nuttallii | 1 | Not Listed | |
| No common name | Hedyotis remyi plana | 1 | Not Listed | |
| No common name | Hedyotis schlechtendahliana nuttallii | 1 | Not Listed | |
| No common name | Hedyotis schlechtendahliana plana | 1 | Not Listed | |
| No common name | Hedyotis schlechtendahliana reticulata | 1 | Not Listed | |
| No common name | Hedyotis tryblium | 1 | Not Listed | |
| No common name | Hedysarum boreale gremiale | 6 | Not Listed | |
| No common name | Hedysarum occidentale canone | 6 | Not Listed | |
| No common name | Helenium arizonicum | 2 | Not Listed | |
| No common name | Helianthus carnosus | 4 | Not Listed | |
| No common name | Helianthus deserticola | 6 | Not Listed | |
| No common name | Helianthus glaucophyllus | 4 | Not Listed | |
| No common name | Helianthus laciniatus crenatus | 2 | Not Listed | |
| No common name | Helianthus praetermissus | 2 | Not Listed | |
| No common name | Helianthus smithii | 4 | Not Listed | |
| No common name | Heliotropium polyphyllum horizontale | 4 | Not Listed | |
| No common name | Hermidium alipes pallidum | 6 | Not Listed | |
| No common name | Herricka horrida | 6 | Not Listed | |
| No common name | Hesperocnide sandwicensis | 1 | Not Listed | |
| No common name | Hesperomannia arborescens | 1 | E | |
| No common name | Hesperomannia arbuscula | 1 | E | |
| No common name | Hesperomannia lydgatei | 1 | E | |
| No common name | heterocampa amanda | Entire | 2 | Not Listed |
| No common name | Heterodermia erinacea | 1 | Not Listed | |
| No common name | Heterotheca rutteri | 2 | Not Listed | |
| No common name | Heuchera missouriensis | 3 | Not Listed | |
| No common name | Heuchera villosa arkansana | 4 | Not Listed | |
| No common name | Hexastylis contracta | 4 | Not Listed | |
| No common name | Hibiscadelphus bombycinus | 1 | Not Listed | |
| No common name | Hibiscadelphus wilderanus | 1 | Not Listed | |
| No common name | Hibiscus waimeae waimeae | 1 | Not Listed | |
| No common name | Hieracium longiberbe | 1 | Not Listed | |
| No common name | Holocarpha virgata elongata | 1 | Not Listed | |
| No common name | holospira animasensis | Entire | 2 | Not Listed |
| No common name | Hymenocallis latifolia | 4 | Not Listed | |
| No common name | Hymenopappus filifolius idahoensis | 1 | Not Listed | |
| No common name | Hymenoxys depressa | 6 | Not Listed | |
| No common name | Hymenoxys helenioides | 6 | Not Listed | |
| No common name | Hymenoxys lapidicola | 6 | Not Listed | |
| No common name | Hymenoxys quinquesquamata | 2 | Not Listed | |
| No common name | Hymenoxys subintegra | 2 | Not Listed | |
| No common name | Hymenoxys turneri | 2 | Not Listed | |
| No common name | Hypericum adpressum | 5 | Not Listed | |
| No common name | Hypericum dolabriforme | 3 | Not Listed | |
| No common name | Hypericum lissophloeus | 4 | Not Listed | |
| No common name | ictalurus species | Entire | 2 | Not Listed |
| No common name | Ilex opaca arenicola | 4 | Not Listed | |
| No common name | Ilex sintenisii | 4 | E | |
| No common name | Illicium parviflorum | 4 | Not Listed | |
| No common name | Ipomoea cairica lineariloba | 1 | Not Listed | |
| No common name | Ipomoea cardiophylla | 2 | Not Listed | |
| No common name | Ipomopsis aggregata webberi | 6 | Not Listed | |
| No common name | Ipomopsis globularis | 6 | Not Listed | |
| No common name | Ipomopsis spicata robruthii | 6 | Not Listed | |
| No common name | Ironoquia plattensis | Entire | 6 | UR |
| No common name | Ivesia cryptocaulis | 1 | Not Listed | |
| No common name | Ivesia jaegeri | 1 | Not Listed | |
| No common name | Ivesia longibracteata | 1 | Not Listed | |
| No common name | Ivesia shockleyi ostleri | 6 | Not Listed | |
| No common name | Jamesia americana zionis | 6 | Not Listed | |
| No common name | Jamesia tetrapetala | 6 | Not Listed | |
| No common name | Jaquinia umbellata | 4 | Not Listed | |
| No common name | Juncus slwookoorum | 7 | Not Listed | |
| No common name | Juncus trifidus carolinianus | 4 | Not Listed | |
| No common name | Justicia borinquensis | 4 | Not Listed | |
| No common name | Justicia culebritae | 4 | Not Listed | |
| No common name | Justicia warnockii | 2 | Not Listed | |
| No common name | juturnia tularosae | Entire | 2 | Not Listed |
| No common name | Kalmiopsis leachiana | 1 | Not Listed | |
| No common name | Keysseria (=Lagenifera) erici | 1 | E | |
| No common name | Keysseria (=Lagenifera) helenae | 1 | E | |
| No common name | Kosteletzkya smilacifolia | 4 | Not Listed | |
| No common name | Labordia baillonii | 1 | Not Listed | |
| No common name | Labordia decurrens decurrens | 1 | Not Listed | |
| No common name | Labordia fagraeoidea longisepala | 1 | Not Listed | |
| No common name | Labordia fagraeoidea saint-johniana | 1 | Not Listed | |
| No common name | Labordia fagraeoidea waianaeana | 1 | Not Listed | |
| No common name | Labordia glabra | 1 | Not Listed | |
| No common name | Labordia hedyosmifolia kilaueana | 1 | Not Listed | |
| No common name | Labordia hedyosmifolia magnifolia | 1 | Not Listed | |
| No common name | Labordia hedyosmifolia robusta | 1 | Not Listed | |
| No common name | Labordia hedyosmifolia rockii | 1 | Not Listed | |
| No common name | Labordia hedyosmifolia skottsbergii | 1 | Not Listed | |
| No common name | Labordia hirtella imbricata | 1 | Not Listed | |
| No common name | Labordia hirtella laevis | 1 | Not Listed | |
| No common name | Labordia hirtella laevisepala | 1 | Not Listed | |
| No common name | Labordia hirtella microcalyx | 1 | Not Listed | |
| No common name | Labordia hirtella microphylla | 1 | Not Listed | |
| No common name | Labordia kaalae brachypoda | 1 | Not Listed | |
| No common name | Labordia kaalae fosbergii | 1 | Not Listed | |
| No common name | Labordia kaalae mendax | 1 | Not Listed | |
| No common name | Labordia molokaiana molokaiana | 1 | Not Listed | |
| No common name | Labordia molokaiana munroi | 1 | Not Listed | |
| No common name | Labordia molokaiana setosa | 1 | Not Listed | |
| No common name | Labordia nelsonii | 1 | Not Listed | |
| No common name | Labordia olympiana | 1 | Not Listed | |
| No common name | Labordia pallida | 1 | Not Listed | |
| No common name | Labordia pedunculata | 1 | Not Listed | |
| No common name | Labordia tinifolia euphorbioidea | 1 | Not Listed | |
| No common name | Labordia tinifolia forbesii | 1 | Not Listed | |
| No common name | Labordia tinifolia honolulensis | 1 | Not Listed | |
| No common name | Labordia tinifolia microgyna | 1 | Not Listed | |
| No common name | Labordia tinifolia parvifolia | 1 | Not Listed | |
| No common name | Labordia tinifolia tenuifolia | 1 | Not Listed | |
| No common name | Labordia wawrana | 1 | Not Listed | |
| No common name | Lachnocaulon beyrichianum | 4 | Not Listed | |
| No common name | Lantana depressa | 4 | Not Listed | |
| No common name | Lathyrus holochlorus | 1 | Not Listed | |
| No common name | Leavenworthia exigua exigua | 4 | Not Listed | |
| No common name | Leavenworthia stylosa | 4 | Not Listed | |
| No common name | Lecanora xanthosora | 1 | Not Listed | |
| No common name | Lechea cernua | 4 | Not Listed | |
| No common name | Lechea divaricata | 4 | Not Listed | |
| No common name | Lechea lakelae | 4 | Not Listed | |
| No common name | Lejeunea blomquistii | 4 | Not Listed | |
| No common name | Lepanthes dodiana | 4 | Not Listed | |
| No common name | Lepanthes eltoroensis | 4 | E | |
| No common name | Lepidium montanum neeseae | 6 | Not Listed | |
| No common name | Lepidium nanum | 1 | Not Listed | |
| No common name | Leptocereus grantianus | 4 | E | |
| No common name | Leptodactylon glabrum | 1 | Not Listed | |
| No common name | Leptodactylon pungens hazeliae | 1 | Not Listed | |
| No common name | Lesquerella arctica scammanae | 7 | Not Listed | |
| No common name | Lesquerella condensata | 6 | Not Listed | |
| No common name | lesquerella navajoensis | 2 | UR | |
| No common name | Lessingia arachnoidea | 1 | Not Listed | |
| No common name | Lessingia micradenia glabrata | 1 | Not Listed | |
| No common name | Lessingia micradenia micradenia | 1 | Not Listed | |
| No common name | Lewisia columbiana wallowensis | 1 | Not Listed | |
| No common name | Lewisia cotyledon purdyi | 1 | Not Listed | |
| No common name | Lewisia maguirei | 1 | Not Listed | |
| No common name | Lewisia tweedyi | 1 | Not Listed | |
| No common name | Liatris cymosa | 2 | Not Listed | |
| No common name | Ligusticum porteri brevilobum | 6 | Not Listed | |
| No common name | Lilaeopsis carolinensis | 4 | Not Listed | |
| No common name | Limbella fryei | 1 | Not Listed | |
| No common name | Limonium limbatum | 2 | Not Listed | |
| No common name | Lindera subcoriacea | 4 | Not Listed | |
| No common name | Linum sulcatum harperi | 4 | Not Listed | |
| No common name | Lipochaeta heterophylla heterophylla | 1 | Not Listed | |
| No common name | Lipochaeta integrifolia argentea | 1 | Not Listed | |
| No common name | Lipochaeta intermedia | 1 | Not Listed | |
| No common name | Lipochaeta lavarum conferta | 1 | Not Listed | |
| No common name | Lipochaeta lavarum hillebrandiana | 1 | Not Listed | |
| No common name | Lipochaeta lavarum maneleana | 1 | Not Listed | |
| No common name | Lipochaeta lavarum ovata | 1 | Not Listed | |
| No common name | Lipochaeta lavarum stearnsii | 1 | Not Listed | |
| No common name | Lipochaeta ovata | 1 | Not Listed | |
| No common name | Lipochaeta porophila | 1 | Not Listed | |
| No common name | Lipochaeta venosa | 1 | E | |
| No common name | litodonta alpina | Entire | 2 | Not Listed |
| No common name | Lobelia appendiculata gattingeri | 4 | Not Listed | |
| No common name | Lobelia dunbariae | 1 | Not Listed | |
| No common name | Lobelia gaudichaudii ssp. koolauensis | 1 | E | |
| No common name | Lobelia hypoleuca rockii | 1 | Not Listed | |
| No common name | Lobelia monostachya | 1 | E | |
| No common name | Lobelia niihauensis | 1 | E | |
| No common name | Lobelia oahuensis | 1 | E | |
| No common name | Lobelia remyi | 1 | Not Listed | |
| No common name | Lomatium attenuatum | 6 | Not Listed | |
| No common name | Lomatium cuspidatum | 1 | Not Listed | |
| No common name | Lomatium hendersonii | 1 | Not Listed | |
| No common name | Lomatium laevigatum | 1 | Not Listed | |
| No common name | Lomatium minimum | 6 | Not Listed | |
| No common name | Lomatium nelsonianum | 1 | Not Listed | |
| No common name | Lomatium oreganum | 1 | Not Listed | |
| No common name | Lomatium quintuplex | 1 | Not Listed | |
| No common name | Lomatium rollinsii | 1 | Not Listed | |
| No common name | Lomatium serpentinum | 1 | Not Listed | |
| No common name | Lomatium thompsonii | 1 | Not Listed | |
| No common name | Lophocolea appalachiana | 4 | Not Listed | |
| No common name | Lotus purshianus helleri | 4 | Not Listed | |
| No common name | Luina serpentina | 1 | Not Listed | |
| No common name | Lunania buchii | 4 | Not Listed | |
| No common name | Lupinus burkei caeruleomontanus | 1 | Not Listed | |
| No common name | Lupinus crassus | 6 | Not Listed | |
| No common name | Lupinus cutleri | 2 | Not Listed | |
| No common name | Lupinus jonesii | 6 | Not Listed | |
| No common name | Lupinus malacophyllus | 1 | Not Listed | |
| No common name | Lupinus montigenus montigenus | 1 | Not Listed | |
| No common name | Lupinus mucronulatus | 1 | Not Listed | |
| No common name | Lupinus sabinii | 1 | Not Listed | |
| No common name | Lupinus sericeus marianus | 6 | Not Listed | |
| No common name | Luzula hawaiiensis oahuensis | 1 | Not Listed | |
| No common name | lycaena ferrisi | Entire | 2 | Not Listed |
| No common name | Lycopodium haleakalae | 1 | Not Listed | |
| No common name | Lygodesmia grandiflora stricta | 6 | Not Listed | |
| No common name | Lyonia truncata var. proctorii | 4 | E | |
| No common name | Lysiloma microphylla thornberi | 2 | Not Listed | |
| No common name | Lysimachia filifolia | 1 | E | |
| No common name | Lysimachia forbesii | 1 | Not Listed | |
| No common name | Lysimachia iniki | 1 | E | |
| No common name | Lysimachia kalalauensis | 1 | Not Listed | |
| No common name | Lysimachia lydgatei | 1 | E | |
| No common name | Lysimachia maxima | 1 | E | |
| No common name | Lysimachia pendens | 1 | E | |
| No common name | Lysimachia scopulensis | 1 | E | |
| No common name | Lysimachia venosa | 1 | E | |
| No common name | Lythrum curtissii | 4 | Not Listed | |
| No common name | Lythrum flagellare | 4 | Not Listed | |
| No common name | Lythrum ovalifolium | 2 | Not Listed | |
| No common name | Machaeranthera ammophila | 1 | Not Listed | |
| No common name | Machaeranthera arizonica | 2 | Not Listed | |
| No common name | Machaeranthera grindelioides depressa | 6 | Not Listed | |
| No common name | Machaeranthera gypsitherma | 2 | Not Listed | |
| No common name | Machaeranthera laetevirens | 1 | Not Listed | |
| No common name | Machaeranthera leucanthemifolia | 1 | Not Listed | |
| No common name | Machaeranthera mucronata | 2 | Not Listed | |
| No common name | Malacothrix crispifolia | 1 | Not Listed | |
| No common name | Malacothrix intermedia | 1 | Not Listed | |
| No common name | Malvastrum hispidum | 3 | Not Listed | |
| No common name | Mammillaria orestera | 2 | Not Listed | |
| No common name | Mammillaria thornberi | 2 | Not Listed | |
| No common name | Manfreda maculosa | 2 | Not Listed | |
| No common name | Manihot davisiae | 2 | Not Listed | |
| No common name | Mappia racemosa | 4 | Not Listed | |
| No common name | Mariscus fauriei | 1 | E | |
| No common name | Mariscus kunthianus | 1 | Not Listed | |
| No common name | Mariscus pennatiformis | 1 | E | |
| No common name | Mariscus rockii | 1 | Not Listed | |
| No common name | Mariscus urbanii | 4 | Not Listed | |
| No common name | Marsdenia elliptica | 4 | Not Listed | |
| No common name | Marshallia ramosa | 4 | Not Listed | |
| No common name | marstonia comalensis | Entire | 2 | Not Listed |
| No common name | Matelea brevicoronata | 2 | Not Listed | |
| No common name | Matelea floridana | 4 | Not Listed | |
| No common name | Matelea parviflora | 2 | Not Listed | |
| No common name | Maytenus cymosa | 4 | Not Listed | |
| No common name | Melanoplus missoulae | Entire | 6 | Not Listed |
| No common name | melanoplus species | Entire | 2 | Not Listed |
| No common name | melanoplus species | Entire | 2 | Not Listed |
| No common name | melanoplus speciesfiftytwo | Entire | 2 | Not Listed |
| No common name | melanoplus speciesfortyeight | Entire | 2 | Not Listed |
| No common name | melanoplus speciessixtytwo | Entire | 2 | Not Listed |
| No common name | melanoplus speciesthirtysix | Entire | 2 | Not Listed |
| No common name | melanoplus speciestwentysix | Entire | 2 | Not Listed |
| No common name | melanoplus speciestwentytwo | Entire | 2 | Not Listed |
| No common name | Melanthera parvifolia | 4 | Not Listed | |
| No common name | mentzelia memorabalis | 2 | Not Listed | |
| No common name | Mentzelia multicaulis labrina | 6 | Not Listed | |
| No common name | Mentzelia shultziorum | 6 | Not Listed | |
| No common name | Mesadenus portoricensis | 4 | Not Listed | |
| No common name | Metrosideros collina newellii | 1 | Not Listed | |
| No common name | mexichthonius exoticus | Entire | 2 | Not Listed |
| No common name | Microseris howellii | 1 | Not Listed | |
| No common name | Microseris laciniata detlingii | 1 | Not Listed | |
| No common name | Microseris nutans siskiyouensis | 1 | Not Listed | |
| No common name | Mimulus hymenophyllus | 1 | Not Listed | |
| No common name | Mimulus jungermannioides | 1 | Not Listed | |
| No common name | Mimulus washoensis | 1 | Not Listed | |
| No common name | Minuartia godfreyi | 4 | Not Listed | |
| No common name | Minuartia marcescens | 5 | Not Listed | |
| No common name | Minuartia uniflora | 4 | Not Listed | |
| No common name | Mitracarpus maxwelliae | 4 | E | |
| No common name | Mitracarpus polycladus | 4 | E | |
| No common name | Monardella diaboli | 1 | Not Listed | |
| No common name | Monotropa brittonii | 4 | Not Listed | |
| No common name | Montia bostockii | 7 | Not Listed | |
| No common name | Muhlenbergia pilosa | 2 | Not Listed | |
| No common name | Munroidendron racemosum | 1 | E | |
| No common name | Musineon lineare | 6 | Not Listed | |
| No common name | Myrcia paganii | 4 | E | |
| No common name | Myriophyllum laxum | 4 | Not Listed | |
| No common name | Najas filifolia | 4 | Not Listed | |
| No common name | Nama retrorsum | 2 | Not Listed | |
| No common name | Nama xylopodum | 2 | Not Listed | |
| No common name | Napaea dioica | 3 | Not Listed | |
| No common name | neoallochernes incertus | Entire | 2 | Not Listed |
| No common name | neoleptoneta anopica | Entire | 2 | Not Listed |
| No common name | neoleptoneta concinna | Entire | 2 | Not Listed |
| No common name | neoleptoneta devia | Entire | 2 | Not Listed |
| No common name | neoleptoneta valverde | Entire | 2 | Not Listed |
| No common name | Neoparrya lithophila | 6 | Not Listed | |
| No common name | Neotrichia downsi | Entire | 6 | Not Listed |
| No common name | Neraudia angulata | 1 | E | |
| No common name | Neraudia kauaiensis | 1 | Not Listed | |
| No common name | Neraudia ovata | 1 | E | |
| No common name | Neraudia sericea | 1 | E | |
| No common name | Nesogenes rotensis | 1 | E | |
| No common name | Nestronia umbellula | 4 | Not Listed | |
| No common name | Neviusia alabamensis | 4 | Not Listed | |
| No common name | Notholaena schaffneri | 2 | Not Listed | |
| No common name | Nototrichium sandwicense decipiens | 1 | Not Listed | |
| No common name | Nototrichium sandwicense dubium | 1 | Not Listed | |
| No common name | Nototrichium sandwicense forbesii | 1 | Not Listed | |
| No common name | Nototrichium sandwicense helleri | 1 | Not Listed | |
| No common name | Nototrichium sandwicense kolekolense | 1 | Not Listed | |
| No common name | Nototrichium sandwicense lanaiense | 1 | Not Listed | |
| No common name | Nototrichium sandwicense lanceolatum | 1 | Not Listed | |
| No common name | Nototrichium sandwicense latifolium | 1 | Not Listed | |
| No common name | Nototrichium sandwicense leptopodum | 1 | Not Listed | |
| No common name | Nototrichium sandwicense longespicatum | 1 | Not Listed | |
| No common name | Nototrichium sandwicense macrophyllum | 1 | Not Listed | |
| No common name | Nototrichium sandwicense mauiense | 1 | Not Listed | |
| No common name | Nototrichium sandwicense niihauense | 1 | Not Listed | |
| No common name | Nototrichium sandwicense olokeleanum | 1 | Not Listed | |
| No common name | Nototrichium sandwicense pulchelloides | 1 | Not Listed | |
| No common name | Nototrichium sandwicense pulchellum | 1 | Not Listed | |
| No common name | Nototrichium sandwicense subcordatum | 1 | Not Listed | |
| No common name | Nototrichium sandwicense syringifolium | 1 | Not Listed | |
| No common name | Nototrichium viride | 1 | Not Listed | |
| No common name | Nuphar luteum ulvaceum | 4 | Not Listed | |
| No common name | Ochrosia compta | 1 | Not Listed | |
| No common name | Oncopodura cruciata | Entire | 6 | Not Listed |
| No common name | Onosmodium helleri | 2 | Not Listed | |
| No common name | Onosmodium molle molle | 4 | Not Listed | |
| No common name | Operculina triquetra | 4 | Not Listed | |
| No common name | Ophioglossum dendroneuron | 4 | Not Listed | |
| No common name | Opuntia basilaris longiareolata | 2 | Not Listed | |
| No common name | Opuntia basilaris woodburyi | 6 | Not Listed | |
| No common name | Opuntia heacockul | 6 | Not Listed | |
| No common name | Opuntia phaeacantha flavispina | 2 | Not Listed | |
| No common name | Opuntia phaeacantha mojavensis | 2 | Not Listed | |
| No common name | Opuntia phaeacantha superbospina | 2 | Not Listed | |
| No common name | Opuntia spinosissima | 4 | Not Listed | |
| No common name | Opuntia triacantha | 4 | Not Listed | |
| No common name | Oreoxis trotteri | 6 | Not Listed | |
| No common name | Oryzopsis contracta | 6 | Not Listed | |
| No common name | Oryzopsis swallenii | 1 | Not Listed | |
| No common name | Osmoxylon mariannense | 1 | E | |
| No common name | Oxypolis ternata | 4 | Not Listed | |
| No common name | Oxytheca watsonii | 1 | Not Listed | |
| No common name | Oxytropis besseyi obnapiformis | 6 | Not Listed | |
| No common name | Oxytropis campestris johannensis | 5 | Not Listed | |
| No common name | Oxytropis campestris wanapum | 1 | Not Listed | |
| No common name | Oxytropis glaberrima | 7 | Not Listed | |
| No common name | Oxytropis jonesii | 6 | Not Listed | |
| No common name | Oxytropis sordida barnebyana | 7 | Not Listed | |
| No common name | Panicum lithophilum | 4 | Not Listed | |
| No common name | Panicum nudicaule | 4 | Not Listed | |
| No common name | Panicum pinetorum | 4 | Not Listed | |
| No common name | Panicum stevensianum | 4 | Not Listed | |
| No common name | Papaver pygmaeum | 6 | Not Listed | |
| No common name | Paronychia chorizanthoides | 2 | Not Listed | |
| No common name | Paronychia drummondii parviflora | 2 | Not Listed | |
| No common name | Paronychia monticola | 2 | Not Listed | |
| No common name | Paronychia nudata | 2 | Not Listed | |
| No common name | Paronychia virginica parksii | 2 | Not Listed | |
| No common name | Parrya nudicaulis | 6 | Not Listed | |
| No common name | Parthenium alpinum | 6 | Not Listed | |
| No common name | Passiflora berteroana | 4 | Not Listed | |
| No common name | Passiflora bilobata | 4 | Not Listed | |
| No common name | Passiflora murucuja | 4 | Not Listed | |
| No common name | Paxistima canbyi | 3 | Not Listed | |
| No common name | Pedicularis rainierensis | 1 | Not Listed | |
| No common name | Pedicularis semibarbata charlestonensis | 1 | Not Listed | |
| No common name | Pediomelum aromaticum tuhyi | 6 | Not Listed | |
| No common name | Pediomelum pariensis | 6 | Not Listed | |
| No common name | Pelea anisata haupuana | 1 | Not Listed | |
| No common name | Pelea clusiaefolia pickeringii | 1 | Not Listed | |
| No common name | Pelea elliptica mauiensis | 1 | Not Listed | |
| No common name | Pelea grandifolia lianoides | 1 | Not Listed | |
| No common name | Pelea grandifolia montana | 1 | Not Listed | |
| No common name | Pelea grandifolia ovalifolia | 1 | Not Listed | |
| No common name | Pelea hiiakae | 1 | Not Listed | |
| No common name | Pelea hosakae | 1 | Not Listed | |
| No common name | Pelea lakae | 1 | Not Listed | |
| No common name | Pelea lanceolata | 1 | Not Listed | |
| No common name | Pelea oblongifolia | 1 | Not Listed | |
| No common name | Pelea olowaluensis | 1 | Not Listed | |
| No common name | Pelea parvifolia sessilis | 1 | Not Listed | |
| No common name | Pelea peduncularis cordata | 1 | Not Listed | |
| No common name | Pelea peduncularis niuensis | 1 | Not Listed | |
| No common name | Pelea peduncularis nummularia | 1 | Not Listed | |
| No common name | Pelea pickeringii | 1 | Not Listed | |
| No common name | Pelea puauluensis | 1 | Not Listed | |
| No common name | Pelea volcanica kohalae | 1 | Not Listed | |
| No common name | Pelea wahiawaensis | 1 | Not Listed | |
| No common name | Pelea waimeaensis | 1 | Not Listed | |
| No common name | Penstemon ammophilum | 6 | Not Listed | |
| No common name | Penstemon angustifolius vernalensis | 6 | Not Listed | |
| No common name | Penstemon arenarius | 1 | Not Listed | |
| No common name | Penstemon atwoodii | 6 | Not Listed | |
| No common name | Penstemon baccharifolius | 2 | Not Listed | |
| No common name | Penstemon barrettiae | 1 | Not Listed | |
| No common name | Penstemon bicolor bicolor | 1 | Not Listed | |
| No common name | Penstemon bicolor roseus | 1 | Not Listed | |
| No common name | Penstemon cobaea purpureus | 3 | Not Listed | |
| No common name | Penstemon crandallii atractus | 6 | Not Listed | |
| No common name | Penstemon dissectus | 4 | Not Listed | |
| No common name | Penstemon elegantulus | 1 | Not Listed | |
| No common name | Penstemon floribundus | 1 | Not Listed | |
| No common name | Penstemon flowersii | 6 | Not Listed | |
| No common name | Penstemon francisci-pennellii | 1 | Not Listed | |
| No common name | Penstemon goodrichii | 6 | Not Listed | |
| No common name | Penstemon humilis brevifolius | 6 | Not Listed | |
| No common name | Penstemon humilis obtusifolius | 6 | Not Listed | |
| No common name | Penstemon leptanthus | 6 | Not Listed | |
| No common name | Penstemon moriahensis | 1 | Not Listed | |
| No common name | Penstemon multicaulis | 4 | Not Listed | |
| No common name | Penstemon navajoa | 6 | Not Listed | |
| No common name | Penstemon parviflorus | 6 | Not Listed | |
| No common name | Penstemon patricus | 1 | Not Listed | |
| No common name | Penstemon peckii | 1 | Not Listed | |
| No common name | Penstemon procerus modestus | 1 | Not Listed | |
| No common name | Penstemon pudicus | 1 | Not Listed | |
| No common name | Penstemon thompsoniae jaegeri | 1 | Not Listed | |
| No common name | Penstemon thurberi anestius | 1 | Not Listed | |
| No common name | Penstemon virgatus pseudoputus | 2 | Not Listed | |
| No common name | Penstemon washingtonensis | 1 | Not Listed | |
| No common name | Penstemon yampaensis | 6 | Not Listed | |
| No common name | Peperomia cookiana minutilimba | 1 | Not Listed | |
| No common name | Peperomia cornifolia | 1 | Not Listed | |
| No common name | Peperomia degeneri | 1 | Not Listed | |
| No common name | Peperomia expallescens brevipilosa | 1 | Not Listed | |
| No common name | Peperomia fauriei | 1 | Not Listed | |
| No common name | Peperomia floridana | 4 | Not Listed | |
| No common name | Peperomia forbesii | 1 | Not Listed | |
| No common name | Peperomia haupuensis | 1 | Not Listed | |
| No common name | Peperomia helleri knudsenii | 1 | Not Listed | |
| No common name | Peperomia lilifolia obtusata | 1 | Not Listed | |
| No common name | Peperomia maunakeana | 1 | Not Listed | |
| No common name | Peperomia megalopoda | 4 | Not Listed | |
| No common name | Peperomia myrtifolia | 4 | Not Listed | |
| No common name | Peperomia oahuensis st-johnii | 1 | Not Listed | |
| No common name | Peperomia plinervata | 1 | Not Listed | |
| No common name | Peperomia rigidilimba | 1 | Not Listed | |
| No common name | Peperomia rockii | 1 | Not Listed | |
| No common name | Peperomia treleasei | 1 | Not Listed | |
| No common name | Peperomia waikamoiana | 1 | Not Listed | |
| No common name | Perityle lemmonii | 2 | Not Listed | |
| No common name | Perityle megalocephala intricata | 1 | Not Listed | |
| No common name | Perityle parryi | 2 | Not Listed | |
| No common name | Perityle specuicola | 6 | Not Listed | |
| No common name | Perityle staurophylla | 2 | Not Listed | |
| No common name | Persea borbonia humilis | 4 | Not Listed | |
| No common name | Persicaria paludicola | 4 | Not Listed | |
| No common name | Peteria thompsonae | 6 | Not Listed | |
| No common name | Petrophytum hendersonii | 1 | Not Listed | |
| No common name | Phacelia constancei | 2 | Not Listed | |
| No common name | Phacelia dubia georgiana | 4 | Not Listed | |
| No common name | Phacelia glaberrima | 1 | Not Listed | |
| No common name | Phacelia inconspicua | 1 | Not Listed | |
| No common name | Phacelia integrifolia texana | 2 | Not Listed | |
| No common name | Phacelia nevadensis | 1 | Not Listed | |
| No common name | Phacelia peckii | 1 | Not Listed | |
| No common name | Phacelia verna | 1 | Not Listed | |
| No common name | Pheidole elecebra | Entire | 6 | Not Listed |
| No common name | Phialanthus myrtilloides | 4 | Not Listed | |
| No common name | Philadelphus mearnsii | 2 | Not Listed | |
| No common name | Philadelphus texensis texensis | 2 | Not Listed | |
| No common name | philomycus bisdodus | Entire | 2 | Not Listed |
| No common name | Phlox buckleyi | 5 | Not Listed | |
| No common name | Phlox peckii | 1 | Not Listed | |
| No common name | Phyllanthus liebmannianus platylepis | 4 | Not Listed | |
| No common name | Phyllanthus pentaphyllus floridanus | 4 | Not Listed | |
| No common name | Phyllanthus sandwicensis degeneri | 1 | Not Listed | |
| No common name | Phyllostegia bracteata | 1 | C | |
| No common name | Phyllostegia brevidens | 1 | Not Listed | |
| No common name | Phyllostegia brevidens ambigua | 1 | Not Listed | |
| No common name | Phyllostegia brevidens degeneri | 1 | Not Listed | |
| No common name | Phyllostegia brevidens heterodoxa | 1 | Not Listed | |
| No common name | Phyllostegia brevidens hirsutula | 1 | Not Listed | |
| No common name | Phyllostegia brevidens pubescens | 1 | Not Listed | |
| No common name | Phyllostegia floribunda | 1 | C | |
| No common name | Phyllostegia glabra var. lanaiensis | 1 | E | |
| No common name | Phyllostegia helleri | 1 | Not Listed | |
| No common name | Phyllostegia hillebrandii | 1 | Not Listed | |
| No common name | Phyllostegia hirsuta | 1 | E | |
| No common name | Phyllostegia hispida | 1 | E | |
| No common name | Phyllostegia imminuta | 1 | Not Listed | |
| No common name | Phyllostegia kaalaensis | 1 | E | |
| No common name | Phyllostegia knudsenii | 1 | E | |
| No common name | Phyllostegia ledyardii | 1 | Not Listed | |
| No common name | Phyllostegia longimontis | 1 | Not Listed | |
| No common name | Phyllostegia mannii | 1 | E | |
| No common name | Phyllostegia mollis | 1 | E | |
| No common name | Phyllostegia mollis fagerlindii | 1 | Not Listed | |
| No common name | Phyllostegia parviflora | 1 | E | |
| No common name | Phyllostegia renovans | 1 | E | |
| No common name | Phyllostegia rockii | 1 | Not Listed | |
| No common name | Phyllostegia variabilis | 1 | Not Listed | |
| No common name | Phyllostegia velutina | 1 | E | |
| No common name | Phyllostegia waimeae | 1 | E | |
| No common name | Phyllostegia warshaueri | 1 | E | |
| No common name | Phyllostegia wawrana | 1 | E | |
| No common name | Physalis viscosa elliotii | 4 | Not Listed | |
| No common name | Physaria acutifolia purpurea | 6 | Not Listed | |
| No common name | Physaria bellii | 6 | Not Listed | |
| No common name | Physaria didymocarpa lyrata | 1 | Not Listed | |
| No common name | Physaria dornii | 6 | Not Listed | |
| No common name | Physaria eburniflora | 6 | Not Listed | |
| No common name | Physaria geyeri purpurea | 1 | Not Listed | |
| No common name | Physostegia leptophylla | 4 | Not Listed | |
| No common name | Physostegia longisepala | 4 | Not Listed | |
| No common name | Physostegia micrantha | 2 | Not Listed | |
| No common name | Pieris phillyreifolia | 4 | Not Listed | |
| No common name | Pilea leptophylla | 4 | Not Listed | |
| No common name | Pilea multicaulis | 4 | Not Listed | |
| No common name | Pilea richardii | 4 | Not Listed | |
| No common name | Pilea yunquensis | 4 | Not Listed | |
| No common name | Pinckneya bracteata | 4 | Not Listed | |
| No common name | Pisonia floridana | 4 | Not Listed | |
| No common name | Pisonia wagneriana | 1 | Not Listed | |
| No common name | Pittosporum acuminatum leptopodum | 1 | Not Listed | |
| No common name | Pittosporum acuminatum magnifolium | 1 | Not Listed | |
| No common name | Pittosporum acuminatum waimeanum | 1 | Not Listed | |
| No common name | Pittosporum argentifolium argentifolium | 1 | Not Listed | |
| No common name | Pittosporum argentifolium sessile | 1 | Not Listed | |
| No common name | Pittosporum cauliflorum cauliflorum | 1 | Not Listed | |
| No common name | Pittosporum cauliflorum cladanthoides | 1 | Not Listed | |
| No common name | Pittosporum cauliflorum pedicellatum | 1 | Not Listed | |
| No common name | Pittosporum cladanthum gracilipes | 1 | Not Listed | |
| No common name | Pittosporum confertiflorum longipes | 1 | Not Listed | |
| No common name | Pittosporum confertiflorum microphyllum | 1 | Not Listed | |
| No common name | Pittosporum glabrum glomeratum | 1 | Not Listed | |
| No common name | Pittosporum glabrum intermedium | 1 | Not Listed | |
| No common name | Pittosporum glabrum tinifolium | 1 | Not Listed | |
| No common name | Pittosporum halophiloides | 1 | Not Listed | |
| No common name | Pittosporum halophilum | 1 | Not Listed | |
| No common name | Pittosporum hawaiiense | 1 | Not Listed | |
| No common name | Pittosporum helleri | 1 | Not Listed | |
| No common name | Pittosporum hosmeri | 1 | Not Listed | |
| No common name | Pittosporum insigne micranthum | 1 | Not Listed | |
| No common name | Pittosporum kahananum | 1 | Not Listed | |
| No common name | Pittosporum kauaiense repens | 1 | Not Listed | |
| No common name | Pittosporum terminalioides lanaiense | 1 | Not Listed | |
| No common name | Pittosporum terminalioides macropus | 1 | Not Listed | |
| No common name | Pittosporum terminalioides mauiense | 1 | Not Listed | |
| No common name | Pityopsis flexuosa | 4 | Not Listed | |
| No common name | Plagiobothrys distantiflorus | 1 | Not Listed | |
| No common name | Plagiochila caduciloba | 4 | Not Listed | |
| No common name | Plagiochila columbiana | 4 | Not Listed | |
| No common name | Plagiochila echinata | 4 | Not Listed | |
| No common name | Plagiochila virginica euryphylla | 4 | Not Listed | |
| No common name | Platanthera holochila | 1 | E | |
| No common name | Platanthera integra | 4 | Not Listed | |
| No common name | Platydesma cornuta cornuta | 1 | PE | |
| No common name | Platydesma cornuta decurrens | 1 | PE | |
| No common name | Platydesma remyi | 1 | C | |
| No common name | Plummera ambigens | 2 | Not Listed | |
| No common name | Plummera floribunda | 2 | Not Listed | |
| No common name | Poa curtifolia | 1 | Not Listed | |
| No common name | Poa eyerdamii | 7 | Not Listed | |
| No common name | Poa laxiflora | 1 | Not Listed | |
| No common name | Poa marcida | 1 | Not Listed | |
| No common name | Poa merrilliana | 7 | Not Listed | |
| No common name | Poa norbergii | 7 | Not Listed | |
| No common name | Poa siphonoglossa | 1 | E | |
| No common name | Podistera yukonensis | 7 | Not Listed | |
| No common name | Polemonium nevadense | 1 | Not Listed | |
| No common name | Polemonium pectinatum | 1 | Not Listed | |
| No common name | Polygala alba | NA | Not Listed | |
| No common name | Polygala boykinii sparsifolia | 4 | Not Listed | |
| No common name | Polygala paucifolia | NA | Not Listed | |
| No common name | Polygala piliophora | 2 | Not Listed | |
| No common name | Polygala rimulicola rimulicola | 2 | Not Listed | |
| No common name | Polygala subspinosa heterorhynca | 1 | Not Listed | |
| No common name | Polygala verticillata | NA | Not Listed | |
| No common name | Polygonum cascadense | 1 | Not Listed | |
| No common name | Polygonum striatulum | 2 | Not Listed | |
| No common name | Polygonum utahense | 6 | Not Listed | |
| No common name | Polymnia laevigata | 4 | Not Listed | |
| No common name | Polystichum calderonense | 4 | E | |
| No common name | Porella appalachiana | 4 | Not Listed | |
| No common name | Porophyllum greggii | 2 | Not Listed | |
| No common name | Porophyllum pygmaeum | 1 | Not Listed | |
| No common name | Portulaca caulerpoides | 4 | Not Listed | |
| No common name | Portulaca molokiniensis | 1 | Not Listed | |
| No common name | Portulaca smallii | 4 | Not Listed | |
| No common name | Portulaca villosa | 1 | Not Listed | |
| No common name | potamilus metnecktayi | Entire | 2 | UR |
| No common name | Potamogeton floridanus | 4 | Not Listed | |
| No common name | Potamogeton lateralis | 5 | Not Listed | |
| No common name | Potamogeton porteri | 5 | Not Listed | |
| No common name | Potentilla angelliae | 6 | Not Listed | |
| No common name | Potentilla cottamii | 6 | Not Listed | |
| No common name | Potentilla multifoliolata | 2 | Not Listed | |
| No common name | Potentilla sierra-blancae | 2 | Not Listed | |
| No common name | Priva portoricensis | 4 | Not Listed | |
| No common name | Proatriplex pleiantha | 2 | Not Listed | |
| No common name | Prunus alleghaniensis davisii | 3 | Not Listed | |
| No common name | Prunus havardii | 2 | Not Listed | |
| No common name | Prunus minutiflora | 2 | Not Listed | |
| No common name | Prunus murrayana | 2 | Not Listed | |
| No common name | Prunus texana | 2 | Not Listed | |
| No common name | Pseudocopaeodes eunus alinea | Entire | 8 | Not Listed |
| No common name | Pseudocopaeodes eunus flavus | Entire | 8 | Not Listed |
| No common name | Pseudocopaeodes eunus ssp. | Entire | 8 | Not Listed |
| No common name | Psoralea subacaulis | 4 | Not Listed | |
| No common name | Psorothamnus kingii | 1 | Not Listed | |
| No common name | Psorothamnus polyadenius jonesii | 6 | Not Listed | |
| No common name | Psorothamnus thompsonae thompsonae | 6 | Not Listed | |
| No common name | Psorothamnus thompsonae whitingii | 2 | Not Listed | |
| No common name | Psychotria insularum paradisii | 1 | Not Listed | |
| No common name | Pteris lidgatei | 1 | E | |
| No common name | ptomaphagus cocytus | Entire | 2 | Not Listed |
| No common name | Pycnanthemum curvipes | 4 | Not Listed | |
| No common name | Pycnanthemum floridanum | 4 | Not Listed | |
| No common name | pyrgulopsis species | Entire | 2 | Not Listed |
| No common name | Randia portoricensis | 4 | Not Listed | |
| No common name | Ranunculus austro-oreganus | 1 | Not Listed | |
| No common name | Ranunculus occidentalis nelsonii | 7 | Not Listed | |
| No common name | Ranunculus reconditus | 1 | Not Listed | |
| No common name | Rauvolfia helleri | 1 | Not Listed | |
| No common name | Rauvolfia mauiensis | 1 | Not Listed | |
| No common name | Rauvolfia molokaiensis parvifolia | 1 | Not Listed | |
| No common name | Rauvolfia sandwicensis subacuminata | 1 | Not Listed | |
| No common name | Remya kauaiensis | 1 | E | |
| No common name | Remya montgomeryi | 1 | E | |
| No common name | rhadine austinica | Entire | 2 | Not Listed |
| No common name | rhadine insolita | Entire | 2 | Not Listed |
| No common name | rhadine noctivaga | Entire | 2 | Not Listed |
| No common name | rhadine russelli | Entire | 2 | Not Listed |
| No common name | Rhinanthus arcticus | 7 | Not Listed | |
| No common name | Rhipsalis baccifera | 4 | Not Listed | |
| No common name | Rhododon ciliatus | 2 | Not Listed | |
| No common name | Rhynchosia cinerea | 4 | Not Listed | |
| No common name | Rhysopterus plurijugus | 1 | Not Listed | |
| No common name | Rollandia angustifolia ochreata | 1 | Not Listed | |
| No common name | Rollandia degenerana | 1 | Not Listed | |
| No common name | Rollandia parvifolia | 1 | Not Listed | |
| No common name | Rollandia sessilifolia | 1 | Not Listed | |
| No common name | Romanzoffia thompsonii | 1 | Not Listed | |
| No common name | Rorippa calycina | 6 | Not Listed | |
| No common name | Rosa stellata stellata | 2 | Not Listed | |
| No common name | Rubus bartonianus | 1 | Not Listed | |
| No common name | Rubus macraei | 1 | Not Listed | |
| No common name | Rubus missouricus | 3 | Not Listed | |
| No common name | Rubus nigerrimus | 1 | Not Listed | |
| No common name | Rudbeckia auriculata | 4 | Not Listed | |
| No common name | Rudbeckia heliopsidis | 4 | Not Listed | |
| No common name | Rudbeckia triloba var. pinnatiloba | 4 | Not Listed | |
| No common name | Ruellia drummondiana | 2 | Not Listed | |
| No common name | Rumex spiralis | 2 | Not Listed | |
| No common name | Sageretia minutiflora | 4 | Not Listed | |
| No common name | Salvia dorrii clokeyi | 1 | Not Listed | |
| No common name | Sanicula kauaiensis | 1 | Not Listed | |
| No common name | Sanicula mariversa | 1 | E | |
| No common name | Sanicula purpurea | 1 | E | |
| No common name | Sanicula sandwicensis | 1 | Not Listed | |
| No common name | Santalum ellipticum littorale | 1 | Not Listed | |
| No common name | Santalum salicifolium | 1 | Not Listed | |
| No common name | Saussurea weberi | 6 | Not Listed | |
| No common name | Saxifraga bryophora tobiasiae | 1 | Not Listed | |
| No common name | Scaevola skottsbergii | 1 | Not Listed | |
| No common name | Schiedea attenuata | 1 | E | |
| No common name | Schiedea haleakalensis | 1 | E | |
| No common name | Schiedea helleri | 1 | E | |
| No common name | Schiedea hookeri | 1 | E | |
| No common name | Schiedea implexa | 1 | Not Listed | |
| No common name | Schiedea kaalae | 1 | E | |
| No common name | Schiedea kauaiensis | 1 | E | |
| No common name | Schiedea lydgatei | 1 | E | |
| No common name | Schiedea mannii | 1 | Not Listed | |
| No common name | Schiedea membranacea | 1 | E | |
| No common name | Schiedea menziesii | 1 | Not Listed | |
| No common name | Schiedea nuttallii | 1 | E | |
| No common name | Schiedea salicaria | 1 | C | |
| No common name | Schiedea sarmentosa | 1 | E | |
| No common name | Schiedea spergulina var. leiopoda | 1 | E | |
| No common name | Schiedea spergulina var. spergulina | 1 | T | |
| No common name | Schiedea verticillata | 1 | E | |
| No common name | Schisandra glabra | 4 | Not Listed | |
| No common name | Schizachyrium niveum | 4 | Not Listed | |
| No common name | Schizachyrium rhizomatum | 4 | Not Listed | |
| No common name | Schoepfia arenaria | 4 | T | |
| No common name | Scleria doradoensis | 4 | Not Listed | |
| No common name | Sclerocactus contortus | 6 | Not Listed | |
| No common name | Sclerocactus spinosior | 6 | Not Listed | |
| No common name | Sclerocactus whipplei heilii | 2 | Not Listed | |
| No common name | Sclerocactus whipplei reevesii | 2 | Not Listed | |
| No common name | Selaginella utahensis | 6 | Not Listed | |
| No common name | Senecio cardamine | 2 | Not Listed | |
| No common name | Senecio hesperius | 1 | Not Listed | |
| No common name | Senecio lynceus leucoreus | 1 | Not Listed | |
| No common name | Senecio neowebsteri | 1 | Not Listed | |
| No common name | Senecio quaerens | 2 | Not Listed | |
| No common name | senecio quaylei | 2 | Not Listed | |
| No common name | Senecio sandvicensis | 1 | Not Listed | |
| No common name | Senecio warnockii | 2 | Not Listed | |
| No common name | Seymeria havardii | 2 | Not Listed | |
| No common name | Shoshonea pulvinata | 6 | Not Listed | |
| No common name | Sibara grisea | 2 | Not Listed | |
| No common name | Sibara rosulata | 1 | Not Listed | |
| No common name | Sicyos hillebrandii | 1 | Not Listed | |
| No common name | Sicyos laysanensis | 1 | Not Listed | |
| No common name | Sicyos maximowiczii | 1 | Not Listed | |
| No common name | Sicyos nihoaensis | 1 | Not Listed | |
| No common name | Sicyos semitonsus | 1 | Not Listed | |
| No common name | Sida inflexa | 5 | Not Listed | |
| No common name | Sidalcea candida | 6 | Not Listed | |
| No common name | Sidalcea cusickii | 1 | Not Listed | |
| No common name | Sidalcea setosa | 1 | Not Listed | |
| No common name | Sida ledyardii | 1 | Not Listed | |
| No common name | Sida nelsonii | 1 | Not Listed | |
| No common name | Sida rubromarginata | 4 | Not Listed | |
| No common name | Silene alexandri | 1 | E | |
| No common name | Silene aperta | 1 | Not Listed | |
| No common name | Silene clokeyi | 1 | Not Listed | |
| No common name | Silene cryptopetala | 1 | Not Listed | |
| No common name | Silene degeneri | 1 | Not Listed | |
| No common name | Silene hawaiiensis | 1 | T | |
| No common name | Silene lanceolata | 1 | E | |
| No common name | Silene perlmanii | 1 | E | |
| No common name | Silene scaposa lobata | 1 | Not Listed | |
| No common name | Silene scaposa scaposa | 1 | Not Listed | |
| No common name | Silene seelyi | 1 | Not Listed | |
| No common name | Silene wrightii | 2 | Not Listed | |
| No common name | Silphium confertifolium | 4 | Not Listed | |
| No common name | Sisymbrium kearneyi | 2 | Not Listed | |
| No common name | Smelowskia borealis villosa | 7 | Not Listed | |
| No common name | Smelowskia holmgrenii | 1 | Not Listed | |
| No common name | Smelowskia pyriformis | 7 | Not Listed | |
| No common name | Smilax leptanthera | 4 | Not Listed | |
| No common name | Smilax melastomifolia melastomifolia | 1 | Not Listed | |
| No common name | Solanum carolinense floridanum | 4 | Not Listed | |
| No common name | Solanum mucronatum | 4 | Not Listed | |
| No common name | Solanum woodburyi | 4 | Not Listed | |
| No common name | Solidago arguta harrissii | 5 | Not Listed | |
| No common name | Solidago lindheimeriana | 2 | Not Listed | |
| No common name | Solidago mollis angustata | 2 | Not Listed | |
| No common name | Solidago ouachitensis | 4 | Not Listed | |
| No common name | Solidago sphathulata gillmanii | 3 | Not Listed | |
| No common name | sonorarctia fervida | Entire | 2 | Not Listed |
| No common name | sonorella huecoensis | Entire | 2 | Not Listed |
| No common name | sonorella pedregosensis | Entire | 2 | Not Listed |
| No common name | sonorella species | Entire | 2 | Not Listed |
| No common name | Sophora arizonica | 2 | Not Listed | |
| No common name | Sophora chrysophylla circularis | 1 | Not Listed | |
| No common name | Sophora chrysophylla elliptica | 1 | Not Listed | |
| No common name | Sophora chrysophylla glabrata | 1 | Not Listed | |
| No common name | Sophora chrysophylla grisea | 1 | Not Listed | |
| No common name | Sophora chrysophylla kanaioensis | 1 | Not Listed | |
| No common name | Sophora chrysophylla kauensis | 1 | Not Listed | |
| No common name | Sophora chrysophylla lanaiensis | 1 | Not Listed | |
| No common name | Sophora chrysophylla makuaensis | 1 | Not Listed | |
| No common name | Sophora chrysophylla unifoliata | 1 | Not Listed | |
| No common name | Sophora formosa | 2 | Not Listed | |
| No common name | Sophora leachiana | 1 | Not Listed | |
| No common name | Spermolepis hawaiiensis | 1 | E | |
| No common name | Sphaeralcea janeae | 6 | Not Listed | |
| No common name | Sphaeralcea procera | 2 | Not Listed | |
| No common name | Sphaeralcea psoraloides | 6 | Not Listed | |
| No common name | sphaeromicola moria | Entire | 2 | Not Listed |
| No common name | sphingicampa blanchardi | Entire | 2 | Not Listed |
| No common name | sphingicampa blanchardi | Entire | 2 | Not Listed |
| No common name | sphingicampa raspa | Entire | 2 | Not Listed |
| No common name | sphinx eremitoides | Entire | 2 | Not Listed |
| No common name | sphinx smithi | Entire | 2 | Not Listed |
| No common name | Spigelia texana | 2 | Not Listed | |
| No common name | Stanleya pinnata gibberosa | 6 | Not Listed | |
| No common name | Stenandrium fascicularis | 2 | Not Listed | |
| No common name | Stenogyne affinis degeneri | 1 | Not Listed | |
| No common name | Stenogyne angustifolia angustifolia | 1 | E | |
| No common name | Stenogyne bifida | 1 | E | |
| No common name | Stenogyne campanulata | 1 | E | |
| No common name | Stenogyne cinerea | 1 | Not Listed | |
| No common name | Stenogyne cranwelliae | 1 | C | |
| No common name | Stenogyne glabrata | 1 | Not Listed | |
| No common name | Stenogyne haliakalae | 1 | Not Listed | |
| No common name | Stenogyne hirsutula | 1 | Not Listed | |
| No common name | Stenogyne kanehoana | 1 | E | |
| No common name | Stenogyne kealiae | 1 | E | |
| No common name | Stenogyne macrantha | 1 | Not Listed | |
| No common name | Stenogyne microphylla | 1 | Not Listed | |
| No common name | Stenogyne mollis | 1 | Not Listed | |
| No common name | Stenogyne oxygona | 1 | Not Listed | |
| No common name | Stenogyne purpurea forbesii | 1 | Not Listed | |
| No common name | Stenogyne rotundifolia oblonga | 1 | Not Listed | |
| No common name | Stenogyne rugosa mollis | 1 | Not Listed | |
| No common name | Stenogyne salicifolia | 1 | Not Listed | |
| No common name | Stenogyne scrophularioides | 1 | Not Listed | |
| No common name | Stenogyne sessilis hexantha | 1 | Not Listed | |
| No common name | Stenogyne sessilis laniensis | 1 | Not Listed | |
| No common name | Stenogyne sessilis wilkesii | 1 | Not Listed | |
| No common name | Stenogyne sherffii | 1 | Not Listed | |
| No common name | Stenogyne sororia | 1 | Not Listed | |
| No common name | Stenogyne viridis | 1 | Not Listed | |
| No common name | Stillingia sylvatica tenuis | 4 | Not Listed | |
| No common name | Stipa curvifolia | 2 | Not Listed | |
| No common name | Streptanthus carinatus | 2 | Not Listed | |
| No common name | streptocephalus thomasbowmani | Entire | 2 | Not Listed |
| No common name | streptocephalus thomasbowmani | Entire | 2 | Not Listed |
| No common name | Stylocline citroleum | 1 | Not Listed | |
| No common name | Stylocline masonii | 1 | Not Listed | |
| No common name | Styphelia tameiameiae hexamera | 1 | Not Listed | |
| No common name | Suaeda rolandii | 5 | Not Listed | |
| No common name | Sullivantia hapemanii | 6 | Not Listed | |
| No common name | Sullivantia oregana | 1 | Not Listed | |
| No common name | Sullivantia purpusii | 6 | Not Listed | |
| No common name | Synthyris canbyi | 6 | Not Listed | |
| No common name | Synthyris missurica hirsuta | 1 | Not Listed | |
| No common name | Synthyris missurica stellata | 1 | Not Listed | |
| No common name | Synthyris pinnatifida canescens | 1 | Not Listed | |
| No common name | Synthyris pinnatifida lanuginosa | 1 | Not Listed | |
| No common name | Synthyris platycarpa | 1 | Not Listed | |
| No common name | Synthyris schizantha | 1 | Not Listed | |
| No common name | Tabernaemontana rotensis | 1 | Not Listed | |
| No common name | Tagetes lemmonii | 2 | Not Listed | |
| No common name | Taraxacum carneocoloratum | 7 | Not Listed | |
| No common name | tartarocreagris intermedia | Entire | 2 | Not Listed |
| No common name | Tauschia stricklandii | 1 | Not Listed | |
| No common name | Tauschia tenuissima | 1 | Not Listed | |
| No common name | Tectaria amesiana | 4 | Not Listed | |
| No common name | Tectaria estremerana | 4 | E | |
| No common name | Teloschistes villosus | 1 | Not Listed | |
| No common name | Tephrosia angustissima | 4 | Not Listed | |
| No common name | Ternstroemia subsessilis | 4 | E | |
| No common name | Tetramolopium arenarium | 1 | E | |
| No common name | Tetramolopium consanguineum consanguineum | 1 | Not Listed | |
| No common name | Tetramolopium consanguineum leptophyllum | 1 | Not Listed | |
| No common name | Tetramolopium conyzoides | 1 | Not Listed | |
| No common name | Tetramolopium filiforme | 1 | E | |
| No common name | Tetramolopium humile sublaeve | 1 | Not Listed | |
| No common name | Tetramolopium kavaiensis koloana | 1 | Not Listed | |
| No common name | Tetramolopium lepidotum arbusculum | 1 | Not Listed | |
| No common name | Tetramolopium lepidotum ssp. lepidotum | 1 | E | |
| No common name | Tetramolopium remyi | 1 | E | |
| No common name | Tetramolopium rockii | 1 | T | |
| No common name | Tetramolopium tenerrimum | 1 | Not Listed | |
| No common name | Tetramolopius kavaiensis koloana | 1 | Not Listed | |
| No common name | tetraneuris verdiensis | 2 | Not Listed | |
| No common name | Tetraplasandra bisattenuata | 1 | E | |
| No common name | Tetraplasandra flynnii | 1 | E | |
| No common name | Tetraplasandra hawaiiensis hawaiiensis | 1 | Not Listed | |
| No common name | Tetraplasandra kahanana | 1 | Not Listed | |
| No common name | Tetraplasandra kohalae | 1 | Not Listed | |
| No common name | Tetraplasandra lanaiensis | 1 | Not Listed | |
| No common name | Tetraplasandra lihuensis gracilipes | 1 | Not Listed | |
| No common name | Tetraplasandra lydgatei | 1 | PE | |
| No common name | Tetraplasandra meiandra bisobtusa | 1 | Not Listed | |
| No common name | Tetraplasandra meiandra bryanii | 1 | Not Listed | |
| No common name | Tetraplasandra meiandra degeneri | 1 | Not Listed | |
| No common name | Tetraplasandra meiandra hillebrandii | 1 | Not Listed | |
| No common name | Tetraplasandra meiandra hiloensis | 1 | Not Listed | |
| No common name | Tetraplasandra meiandra leptomera | 1 | Not Listed | |
| No common name | Tetraplasandra meiandra makalehana | 1 | Not Listed | |
| No common name | Tetraplasandra meiandra rhynchocarpoides | 1 | Not Listed | |
| No common name | Tetraplasandra meiandra simulans | 1 | Not Listed | |
| No common name | Tetraplasandra munroi | 1 | Not Listed | |
| No common name | Tetraplasandra oahuensis eradiata | 1 | Not Listed | |
| No common name | Tetraplasandra oahuensis fauriei | 1 | Not Listed | |
| No common name | Tetraplasandra oahuensis hailiensis | 1 | Not Listed | |
| No common name | Tetraplasandra oahuensis longipes | 1 | Not Listed | |
| No common name | Tetraplasandra oahuensis pseudorhachis | 1 | Not Listed | |
| No common name | Tetraplasandra pupukeensis nitida | 1 | Not Listed | |
| No common name | Tetraplasandra pupukeensis pupukeensis | 1 | Not Listed | |
| No common name | Tetraplasandra pupukeensis venosa | 1 | Not Listed | |
| No common name | Tetraplasandra turbans | 1 | Not Listed | |
| No common name | Tetraplasandra waialealae urceolata | 1 | Not Listed | |
| No common name | Tetraplasandra waimeae angustior | 1 | Not Listed | |
| No common name | texella brevidenta | Entire | 2 | Not Listed |
| No common name | texella brevistyla | Entire | 2 | Not Listed |
| No common name | texella diplospina | Entire | 2 | Not Listed |
| No common name | texella fendi | Entire | 2 | Not Listed |
| No common name | texella grubbsi | Entire | 2 | Not Listed |
| No common name | texella hardeni | Entire | 2 | Not Listed |
| No common name | texella renkesae | Entire | 2 | Not Listed |
| No common name | texella welbourni | Entire | 2 | Not Listed |
| No common name | texiweckelia relicta | Entire | 2 | Not Listed |
| No common name | Thalictrum arkansanum | 2 | Not Listed | |
| No common name | Thalictrum debile | 4 | Not Listed | |
| No common name | Thalictrum heliophilum | 6 | Not Listed | |
| No common name | Thalictrum mirabile | 4 | Not Listed | |
| No common name | Thalictrum subrotundum | 4 | Not Listed | |
| No common name | thalkethops grallatrix | 2 | Not Listed | |
| No common name | Thelesperma caespitosum | 6 | Not Listed | |
| No common name | Thelesperma pubescens | 6 | Not Listed | |
| No common name | Thelesperma subnudum alpinum | 6 | Not Listed | |
| No common name | Thelocactus bicolor flavidispinus | 2 | Not Listed | |
| No common name | Thelypodium eucosmum | 1 | Not Listed | |
| No common name | Thelypodium laxiflorum | 6 | Not Listed | |
| No common name | Thelypodium sagittatum ovalifolium | 6 | Not Listed | |
| No common name | Thelypodium vernale | 2 | Not Listed | |
| No common name | Thelypteris hastata heterodoxa | 4 | Not Listed | |
| No common name | Thelypteris inabonensis | 4 | E | |
| No common name | Thelypteris verecunda | 4 | E | |
| No common name | Thelypteris yaucoensis | 4 | E | |
| No common name | Thismia americana | 3 | Not Listed | |
| No common name | Thlaspi arcticum | 7 | Not Listed | |
| No common name | Thlaspi montanum siskiyouense | 1 | Not Listed | |
| No common name | thymoites minero | Entire | 2 | Not Listed |
| No common name | Tithonia thurberi | 2 | Not Listed | |
| No common name | Tofieldia glutinosa absona | 1 | Not Listed | |
| No common name | Townsendia alpigena minima | 6 | Not Listed | |
| No common name | Townsendia jonesii tumulosa | 1 | Not Listed | |
| No common name | Tradescantia edwardsiana | 2 | Not Listed | |
| No common name | Tradescantia ozarkana | 4 | Not Listed | |
| No common name | Tragia nigricans | 2 | Not Listed | |
| No common name | Tragia saxicola | 4 | Not Listed | |
| No common name | Trematolobelia grandifolia | 1 | Not Listed | |
| No common name | Trematolobelia singularis | 1 | E | |
| No common name | Trichomanes draytonianum | 1 | Not Listed | |
| No common name | Trifolium andinum podocephalum | 1 | Not Listed | |
| No common name | Trillium pusillum monticulum | 5 | Not Listed | |
| No common name | Trillium pusillum pusillum | 4 | Not Listed | |
| No common name | Trisetum orthochaetum | 6 | Not Listed | |
| No common name | Triteleia lemmonae | 2 | Not Listed | |
| No common name | Triteleiopsis palmeri | 2 | Not Listed | |
| No common name | Trollius laxus laxus | 5 | Not Listed | |
| No common name | tuberochernes ubicki | Entire | 2 | Not Listed |
| No common name | Urera konaensis | 1 | Not Listed | |
| No common name | ursia furtiva | Entire | 2 | Not Listed |
| No common name | ursia species | Entire | 2 | Not Listed |
| No common name | Urtica chamaedryoides | 2 | Not Listed | |
| No common name | Usnea longissima | 8 | Not Listed | |
| No common name | Vaccinium vacillans missouriense | 3 | Not Listed | |
| No common name | Valeriana columbiana | 1 | Not Listed | |
| No common name | Verbena maritima | 4 | Not Listed | |
| No common name | Verbesina heterophylla | 4 | Not Listed | |
| No common name | Vernonia borinquensis | 4 | Not Listed | |
| No common name | Vernonia proctorii | 4 | E | |
| No common name | Vernonia pulchella | 4 | Not Listed | |
| No common name | Veronica sherwoodii | 1 | Not Listed | |
| No common name | Vigna o-wahuensis | 1 | E | |
| No common name | Viguiera porteri | 4 | Not Listed | |
| No common name | Viola adunca cascadensis | 1 | Not Listed | |
| No common name | Viola egglestonii | 4 | Not Listed | |
| No common name | Viola helenae | 1 | E | |
| No common name | Viola lanaiensis | 1 | E | |
| No common name | Viola lithion | 6 | Not Listed | |
| No common name | Viola oahuensis | 1 | E | |
| No common name | Viola robusta | 1 | Not Listed | |
| No common name | Waldsteinia idahoensis | 1 | Not Listed | |
| No common name | Waltheria pyrolaefolia | 1 | Not Listed | |
| No common name | Wikstroemia basicorda | 1 | Not Listed | |
| No common name | Wikstroemia hanalei | 1 | Not Listed | |
| No common name | Wikstroemia isae | 1 | Not Listed | |
| No common name | Wikstroemia leptantha | 1 | Not Listed | |
| No common name | Wikstroemia monticola occidentalis | 1 | Not Listed | |
| No common name | Wikstroemia perdita | 1 | Not Listed | |
| No common name | Wikstroemia skottsbergiana | 1 | Not Listed | |
| No common name | Wikstroemia villosa | 1 | Not Listed | |
| No common name | Wilkstroemia bicornuta | 1 | Not Listed | |
| No common name | Willkommia texana | 2 | Not Listed | |
| No common name | Woodsia abbeae | 3 | Not Listed | |
| No common name | xanthoparmelia dissensa | 2 | Not Listed | |
| No common name | xanthoparmelia planilobata | 2 | Not Listed | |
| No common name | Xylorhiza confertifolia | 6 | Not Listed | |
| No common name | Xylorhiza cronquistii | 6 | Not Listed | |
| No common name | Xylosma crenatum | 1 | E | |
| No common name | Xyris isoetifolia | 4 | Not Listed | |
| No common name | Xyris scabrifolia | 4 | Not Listed | |
| No common name | Yucca angustissima toftiae | 6 | Not Listed | |
| No common name | yucca cernua | 2 | Not Listed | |
| No common name | Zanthoxylum glandulosum | 1 | Not Listed | |
| No common name | Zanthoxylum kauaense kohuana | 1 | Not Listed | |
| No common name | Zanthoxylum maviense | 1 | Not Listed | |
| No common name | Zephyranthes simpsonii | 4 | Not Listed | |
| No common name | Zephyranthes treatiae | 4 | Not Listed | |
| No common name | Zizia latifolia | 4 | Not Listed | |
| Noctuid moth, Annointed sallow | Pyreferra ceromatica | Entire | 4 | Not Listed |
| Noctuid moth, black-veined agrotis | Agrotis melanoneura | Entire | 1 | Not Listed |
| Noctuid moth, Carter's | Spartiniphaga carterae | Entire | 4 | Not Listed |
| Noctuid moth, Cremata agrotis | Agrotis cremata | Entire | 1 | Not Listed |
| Noctuid moth, Hebard's | Erythroecia hebardi | Entire | 3 | Not Listed |
| Noctuid moth, microreas agrotis | Agrotis microreas | Entire | 1 | Not Listed |
| Noctuid moth, potophila agrotis | Agrotis potophila | Entire | 1 | Not Listed |
| Noctuid moth, red anomis | Anomis vulpicolor | Entire | 1 | Not Listed |
| Noctuid moth, scrub golden aster | Schinia rufipenna | Entire | 4 | Not Listed |
| Noctuid moth, tortoise commensal | Idia gopheri | Entire | 4 | Not Listed |
| Noctuid moth, [unnamed] | Luperina trigona | Entire | 4 | Not Listed |
| Noctuid moth, [unnamed] | Papaipema aerata | Entire | 5 | Not Listed |
| Noctuid moth, [unnamed] | Papaipema aweme | Entire | 3 | Not Listed |
| Noctuid moth, [unnamed] | Schinia indiana | Entire | 3 | Not Listed |
| Noctuid, Venus flytrap | Hemipachnolia subporphyria subporphyria | Entire | 4 | Not Listed |
| Nodding-caps, Craighead's | Triphora craigheadii | 4 | Not Listed | |
| Nodding-caps, [unnamed] | Triphora latifolia | 4 | Not Listed | |
| Nodding-caps, [unnamed] | Triphora rickettii | 4 | Not Listed | |
| Nohoanu | Geranium hanaense | 1 | C | |
| Nohoanu | Geranium hillebrandii | 1 | C | |
| Nohoanu | Geranium kauaiense | 1 | E | |
| Nohoanu | Geranium multiflorum | 1 | E | |
| None | Esenbeckia runyonii | 2 | Not Listed | |
| Noni kuahiwi | Morinda trimera | 1 | Not Listed | |
| Nukupu`u (honeycreeper) | Hemignathus lucidus | Entire | 1 | E |
| Numbat | Myrmecobius fasciatus | Entire | Foreign | E |
| Nuthatch, Algerian | Sitta ledanti | Entire | Foreign | E |
| nuthatch, White-breasted | sitta carolinensis ssp. aculeata | Entire | 6 | Not Listed |
| Oak, blue | Quercus douglasii | NA | Not Listed | |
| Oak, Boynton's | Quercus boyntonii | 2 | Not Listed | |
| Oak, California black | Quercus kelloggii | NA | Not Listed | |
| Oak, Chisos Mountains | Quercus tardifolia | 2 | Not Listed | |
| oak, Engelmann | quercus engelmannii | 6 | Not Listed | |
| Oak fern, sp. nov. ined. (Appalachian) | Gymnocarpium sp. | 5 | Not Listed | |
| Oak, Hinckley | Quercus hinckleyi | 2 | T | |
| Oak, island | Quercus tomentella | 1 | Not Listed | |
| Oak, maple-leaf | Quercus shumardii acerifolia | 4 | Not Listed | |
| Oak, Nuttall's scrub | Quercus dumosa | 1 | Not Listed | |
| Oak, Oglethorpe | Quercus oglethorpensis | 4 | Not Listed | |
| Oak, Santa Cruz Island | Quercus parvula | 1 | Not Listed | |
| oak, Scrub | Quercus berberidifolia | 1 | Not Listed | |
| Oak, slender | Quercus graciliformis | 2 | Not Listed | |
| Oak, [unnamed] | Quercus arkansana | 4 | Not Listed | |
| Oak, [unnamed] | Quercus georgiana | 4 | Not Listed | |
| Oak, Valley | Quercus lobata | NA | Not Listed | |
| Ocelot | Leopardus (=Felis) pardalis | Entire | 2 | E |
| Oconee-bells | Shortia galacifolia | 4 | Not Listed | |
| Oconee-bells, short-styled | Shortia galacifolia brevistyla | 4 | Not Listed | |
| Oha | Delissea rivularis | 1 | E | |
| Oha | Delissea subcordata | 1 | E | |
| Ohai | Sesbania tomentosa | 1 | E | |
| `Oha wai | Clermontia drepanomorpha | 1 | E | |
| `Oha wai | Clermontia lindseyana | 1 | E | |
| `Oha wai | Clermontia oblongifolia ssp. brevipes | 1 | E | |
| `Oha wai | Clermontia oblongifolia ssp. mauiensis | 1 | E | |
| `Oha wai | Clermontia peleana | 1 | E | |
| `Oha wai | Clermontia pyrularia | 1 | E | |
| `Oha wai | Clermontia samuelii | 1 | E | |
| `Ohe | Joinvillea ascendens ascendens | 1 | C | |
| `Ohe | Reynoldsia sandwicensis | 1 | Not Listed | |
| `Ohe | Tetraplasandra hawaiiensis microcarpa | 1 | Not Listed | |
| `Ohe | Tetraplasandra kaalae multiplex | 1 | Not Listed | |
| `Ohe`ohe | Tetraplasandra gymnocarpa | 1 | E | |
| `Ohe`ohe | Tetraplasandra kavaiensis grandis | 1 | Not Listed | |
| `Ohe`ohe | Tetraplasandra kavaiensis koloana | 1 | Not Listed | |
| `Ohe`ohe | Tetraplasandra kavaiensis occidua | 1 | Not Listed | |
| `Ohe`ohe ) | Tetraplasandra kavaiensis dipyrena | 1 | Not Listed | |
| `Ohe`ohe e | Tetraplasandra kavaiensis intercedens | 1 | Not Listed | |
| `Ohe`ohe s | Tetraplasandra kavaiensis nahikuensis | 1 | Not Listed | |
| Olaga | Opuntia borinquensis | 4 | Not Listed | |
| Olapa, [unnamed] | Cheirodendron trigynum rockii | 1 | Not Listed | |
| Olapa, [unnamed] | Cheirodendron trigynum subcordatum | 1 | Not Listed | |
| Old man's beard | Clematis micrantha | 4 | Not Listed | |
| Olulu | Brighamia insignis | 1 | E | |
| Onion, Aase's | Allium aaseae | 1 | Not Listed | |
| Onion, Beegum | Allium hoffmanii | 1 | Not Listed | |
| Onion, Blue Mountain | Allium dictuon | 1 | Not Listed | |
| Onion, Goodding's | Allium gooddingii | 2 | Not Listed | |
| Onion, Hickman's | Allium hickmanii | 1 | Not Listed | |
| Onion, Howell's | Allium pleianthum | 1 | Not Listed | |
| Onion, Jepson's | Allium jepsoni | 1 | Not Listed | |
| Onion, Munz's | Allium munzii | 8 | E | |
| Onion, Passey's | Allium passeyi | 6 | Not Listed | |
| Onion, Rawhide Hill | Allium tuolumnense | 1 | Not Listed | |
| Onion, Siskiyou | Allium tribracteatum | 1 | Not Listed | |
| Onion, Spanish needle | Allium shevockii | 1 | Not Listed | |
| Onion, [unnamed] | Allium constrictum | 1 | Not Listed | |
| Onion, [unnamed] | Allium madidum | 1 | Not Listed | |
| Onion, [unnamed] | Allium oxyphilum | 5 | Not Listed | |
| Onion, [unnamed] | Allium perdulce sperryi | 2 | Not Listed | |
| Onion, [unnamed] | Allium robinsonii | 1 | Not Listed | |
| Onion, [unnamed] | Allium scilloides | 1 | Not Listed | |
| Onion, [unnamed] | Allium speculae | 4 | Not Listed | |
| Onion, [unnamed] | Allium tolmiei persimile | 1 | Not Listed | |
| Onion, Yosemite | Allium yosemitense | 1 | Not Listed | |
| onion, Yucaipa | allium haematochiton | 6 | Not Listed | |
| `O`o, Bishop's | Moho bishopi | Entire | 1 | Not Listed |
| `O`o, Kauai (honeyeater) | Moho braccatus | Entire | 1 | E |
| O`opu alamo`o | Lentipes concolor | Entire | 1 | Not Listed |
| Opuhe | Urera kaalae | 1 | E | |
| Orangutan | Pongo pygmaeus | Entire | Foreign | E |
| Orb, golden | Quadrula aurea | Entire | 2 | C |
| Orchid, dollar | Encyclia boothiana erythronioides | 4 | Not Listed | |
| Orchid, eastern prairie fringed | Platanthera leucophaea | 3 | T | |
| Orchid, purple fringeless | Platanthera peramoena | 4 | Not Listed | |
| Orchid, tiny | Lepanthopsis melanantha | 4 | Not Listed | |
| Orchid, western prairie fringed | Platanthera praeclara | 3 | T | |
| Orchid, white fringeless | Platanthera integrilabia | 4 | C | |
| Orcutt grass, California | Orcuttia californica | 8 | E | |
| Orcutt grass, hairy | Orcuttia pilosa | 8 | E | |
| Orcutt grass, Sacramento | Orcuttia viscida | 8 | E | |
| Orcutt grass, San Joaquin | Orcuttia inaequalis | 8 | T | |
| Orcutt grass, slender | Orcuttia tenuis | 8 | T | |
| Oreganillo | Eupatorium droserolepis | 4 | Not Listed | |
| Oregonian, Columbia | Cryptomastix hendersoni | Entire | 1 | UR |
| Oregonian Kingston | Cryptomastix sanburni | Entire | 6 | Not Listed |
| Oregonian, Mission Creek | Cryptomastix magnidentata | Entire | 1 | Not Listed |
| oregonian, Puget | Cryptomastix devia | Entire | 1 | UR |
| Oriole, Audubon's | Icterus graduacauda audubonii | Entire | 2 | Not Listed |
| Oriole, Mexican hooded | Icterus cucullatus cucullatus | Entire | 2 | Not Listed |
| Oriole, Sennett's hooded | Icterus cucullatus sennetti | Entire | 2 | Not Listed |
| Orthocarpus, San Bernardino Mountains | Castilleja lasiorhyncha | 1 | Not Listed | |
| Orthocarpus, Shasta | Orthocarpus pachystachyus | 1 | Not Listed | |
| Oryctes, Nevada | Oryctes nevadensis | 1 | Not Listed | |
| Oryx, Arabian | Oryx leucoryx | Entire | Foreign | E |
| Oryx, scimitar-horned | Oryx dammah | Entire | Foreign | E |
| osprey | pandion haliaetus | Entire | 6 | Not Listed |
| Ostracod, Grayson crayfish | Ascetocthere cosmeta | Entire | 4 | Not Listed |
| Ostracod, Oconee crayfish | Cymocythere clavata | Entire | 4 | Not Listed |
| ostracod, Pee Dee crayfish | Dactylocythere peedeensis | Entire | 4 | Not Listed |
| Ostracod, [unnamed] | Dactylocythere isabelae | Entire | 4 | Not Listed |
| Ostracod, [unnamed] | Waltoncythere acuta | Entire | 4 | Not Listed |
| Ostracod, whitewater crayfish | Dactylocythere prinsi | Entire | 4 | Not Listed |
| Ostrich, Arabian | Struthio camelus syriacus | Entire | Foreign | E |
| Ostrich, West African | Struthio camelus spatzi | Entire | Foreign | E |
| Otter, Cameroon clawless | Aonyx congicus (=congica) microdon | Entire | Foreign | E |
| Otter, giant | Pteronura brasiliensis | Entire | Foreign | E |
| Otter, long-tailed | Lontra (=Lutra) longicaudis (incl. platensis) | Entire | Foreign | E |
| Otter, marine | Lontra (=Lutra) felina | Entire | Foreign | E |
| Otter, Northern Sea | Enhydra lutris kenyoni | southwest Alaska DPS (Aleutian Islands, Alaska Peninsula coast, and Kodiak Archipelago) | 7 | T |
| Otter, river | Lutra canadensis | Entire | 9 | Not Listed |
| Otter, southern river | Lontra (=Lutra) provocax | Entire | Foreign | E |
| Otter, southern sea | Enhydra lutris nereis | All areas subject to U.S. jurisdiction south of Pt. Conception, CA (34026.9' N. Lat.) [Note--status governed by Pub. L. 99-625, 100 Stat. 3500.] | 8 | EXPN |
| Otter, southern sea | Enhydra lutris nereis | Entire, except where listed below | 8 | T |
| Otter, southwestern | Lutra canadensis sonora | Entire | 2 | Not Listed |
| `O`u (honeycreeper) | Psittirostra psittacea | Entire | 1 | E |
| Oval, Calico Rock | Mesodon clenchi | Entire | 4 | Not Listed |
| Owl, Anjouan scops | Otus rutilus capnodes | Entire | Foreign | E |
| Owl, California spotted | Strix occidentalis occidentalis | entire | 8 | Not Listed |
| Owl, elf | Micrathene whitneyi | Entire | 6 | Not Listed |
| Owlet, Morden's | Otus ireneae | Entire | Foreign | E |
| Owl, Flammulated | Otus flammeolus | Entire | 1 | Not Listed |
| Owl, giant scops | Mimizuku (=Otus) gurneyi | Entire | Foreign | E |
| Owl, grass | Tyto longimembris | Entire | Foreign | UR |
| Owl, Hawaiian short-eared | Asio flammeus sandwichensis | Entire | 1 | Not Listed |
| Owl, Lanyu Scops | Otus elegans botelensis | Entire | Foreign | UR |
| owl, Long-eared | asio otus | Entire | 7 | Not Listed |
| Owl, Madagascar red | Tyto soumagnei | Entire | Foreign | E |
| Owl, Mexican spotted | Strix occidentalis lucida | Entire | 2 | T |
| Owl, northern spotted | Strix occidentalis caurina | Entire | 1 | T |
| Owl, Palau | Pyrroglaux podargina | Entire | Foreign | DM |
| Owl, Ponape short-eared | Asio flammeus ponapensis | Entire | Foreign | Unlist |
| Owl's-clover, fleshy | Castilleja campestris ssp. succulenta | 8 | T | |
| Owl's-clover, San Francisco | Triphysaria floribunda | 1 | Not Listed | |
| Owl, Seychelles scops | Otus magicus (=insularis) insularis | Entire | Foreign | E |
| Owl, Virgin Islands screech | Otus nudipes newtoni | Entire | 4 | Not Listed |
| Owl, western burrowing | Athene cunicularia hypugea | Entire | 1 | Not Listed |
| oxytheca, chickweed | Oxytheca caryophylloides | 1 | Not Listed | |
| Oxytheca, Cienega Seca | Oxytheca parishii ciengensis | 1 | Not Listed | |
| Oxytheca, cushenbury | Oxytheca parishii var. goodmaniana | 8 | E | |
| Oxytrope, Kokrines | Oxytropis kokrinensis | 7 | Not Listed | |
| Oystercatcher, american | Haematopus palliatus | Entire | 4 | Not Listed |
| Oystercatcher, Canarian black | Haematopus meadewaldoi | Entire | Foreign | E |
| Oystercatcher, Chatham Island | Haematopus chathamensis | Entire | Foreign | UR |
| Paddlefish | Polyodon spathula | Entire | 3 | Not Listed |
| Pa`iniu | Astelia veratroides gracilis | 1 | Not Listed | |
| Pa`iniu | Astelia veratroides macrosperma | 1 | Not Listed | |
| Pa`iniu | Astelia veratroides veratroides | 1 | Not Listed | |
| Pa`iniu | Astelia waialealae | 1 | E | |
| Paintbrush, Aquarius | Castilleja aquariensis | 6 | Not Listed | |
| Paintbrush, ash-grey | Castilleja cinerea | 8 | T | |
| Paintbrush, Christ's | Castilleja christii | 1 | C | |
| paintbrush, Clokey | castilleja applegatei ssp. martinii var. clokeyi | 6 | Not Listed | |
| Paintbrush, common Wallowa | Castilleja ownbeyana | 1 | Not Listed | |
| Paintbrush, Culbertson's | Castilleja culbertsonii | 1 | Not Listed | |
| Paintbrush, Ewan's | Castilleja martinii ewanii | 1 | Not Listed | |
| Paintbrush, golden | Castilleja levisecta | 1 | T | |
| Paintbrush, green-tinged | Castilleja chlorotica | 1 | Not Listed | |
| Paintbrush, Kaibab | Castilleja kaibabensis | 2 | Not Listed | |
| Paintbrush, Lemmon's | Castilleja lassenensis | 1 | Not Listed | |
| Paintbrush, Mendocino coast | Castilleja mendocinensis | 1 | Not Listed | |
| Paintbrush, Monte Neva | Castilleja salsuginosa | 8 | Not Listed | |
| Paintbrush, Mt. Gleason | Castilleja gleasonii | 1 | Not Listed | |
| Paintbrush, Obscure Indian | Castilleja cryptantha | 1 | Not Listed | |
| Paintbrush, Pitkin Marsh | Castilleja uliginosa | 1 | Not Listed | |
| Paintbrush, Point Reyes | Castilleja leschkeana | 1 | Not Listed | |
| Paintbrush, short-lobed | Castilleja brevilobata | 1 | Not Listed | |
| Paintbrush, Siskiyou | Castilleja elata | 1 | Not Listed | |
| Paintbrush, soft-leaved | Castilleja mollis | 8 | E | |
| Paintbrush, Steen's mountain | Castilleja pilosa steenensis | 1 | Not Listed | |
| Paintbrush, tall | Castilleja elongata | 2 | Not Listed | |
| Paintbrush, Tiburon | Castilleja affinis ssp. neglecta | 8 | E | |
| Paintbrush, white-felted | Castilleja hololeuca | 1 | Not Listed | |
| Paintbrush, White Mountains | Castilleja mogollonica | 2 | Not Listed | |
| Palila (honeycreeper) | Loxioides bailleui | Entire | 1 | E |
| Palmetto, Miami | Sabal miamiensis | 4 | Not Listed | |
| Palm, needle | Rhapidophyllum hystrix | 4 | Not Listed | |
| Palm, royal, Florida | Roystonea elata | 4 | Not Listed | |
| Palo colorado | Ternstroemia luquillensis | 4 | E | |
| Palo de jazmin | Styrax portoricensis | 4 | E | |
| Palo de nigua | Cornutia obovata | 4 | E | |
| Palo de ramon | Banara vanderbiltii | 4 | E | |
| Palo de rosa | Ottoschulzia rhodoxylon | 4 | E | |
| Palo de violeta | Polygala cowellii | 4 | Not Listed | |
| Pamakani | Tetramolopium capillare | 1 | E | |
| Pamakani | Viola chamissoniana ssp. chamissoniana | 1 | E | |
| panaunau | lobelia yuccoides | 1 | Not Listed | |
| Panda, giant | Ailuropoda melanoleuca | Entire | Foreign | E |
| Pangolin, Temnick's ground | Manis temminckii | Entire | Foreign | E |
| Panicgrass, Carter's | Panicum fauriei var. carteri | 1 | E | |
| Panic grass, Faurie's | Panicum fauriei fauriei | 1 | Not Listed | |
| Panic grass, Fernald's | Panicum mundum | 5 | Not Listed | |
| Panic grass, Hirst Brothers' | Dichanthelium (=Panicum) hirstii | 5 | C | |
| Panic grass, Shasta | Panicum shastense | 1 | Not Listed | |
| Panic grass, Sonoran | Panicum sonoran | NA | Not Listed | |
| Panic grass, The Geysers | Dichanthelium lanuginosum thermale | 1 | Not Listed | |
| Panic grass, [unnamed] | Panicum aculeatum | 5 | Not Listed | |
| Panic grass, [unnamed] | Panicum alakaiense | 1 | Not Listed | |
| Panic grass, [unnamed] | Panicum lamiatile | 1 | Not Listed | |
| Panic grass, [unnamed] | Panicum lustriale | 1 | Not Listed | |
| Panther, Florida | Puma (=Felis) concolor coryi | Entire | 4 | E |
| Papala | Charpentiera densiflora | 1 | E | |
| Papershell, Cumberland | Anodontoides denigrata | Entire | 4 | Not Listed |
| Papillosus, small | Echinocereus papillosus angusticeps | 2 | Not Listed | |
| Parakeet, blue-throated (=ochre-marked) | Pyrrhura cruentata | Entire | Foreign | E |
| Parakeet, Forbes' | Cyanoramphus auriceps forbesi | Entire | Foreign | E |
| Parakeet, golden | Aratinga guarouba | Entire | Foreign | E |
| Parakeet, golden-shouldered | Psephotus chrysopterygius | Entire | Foreign | E |
| Parakeet, grey-cheeked | Brotogeris pyrrhoptera | Entire | Foreign | Not Listed |
| Parakeet, Mauritius | Psittacula echo | Entire | Foreign | E |
| Parakeet, Norfolk Island | Cyanoramphus cookii (=novaezelandiae c.) | Entire | Foreign | E |
| Parakeet, orange-bellied | Neophema chrysogaster | Entire | Foreign | E |
| Parakeet, orange-fronted | Cyanoramphus malherbi | Entire | Foreign | UR |
| Parakeet, paradise | Psephotus pulcherrimus | Entire | Foreign | E |
| Parakeet, scarlet-chested | Neophema splendida | Entire | Foreign | E |
| Parakeet, turquoise | Neophema pulchella | Entire | Foreign | E |
| Parakeet, Uvea | Eunymphicus uveaensis | Entire | Foreign | UR |
| Parnassian, Strohbeen's | Parnassius clodius strohbeeni | Entire | 1 | Not Listed |
| Parrot, Bahaman or Cuban | Amazona leucocephala | Entire | Foreign | E |
| Parrotbill, Maui (honeycreeper) | Pseudonestor xanthophrys | Entire | 1 | E |
| Parrot, crimson shining | Prosopeia splendens | Entire | Foreign | Not Listed |
| Parrotfinch, Palau blue-faced | Erythrura trichroa pelewensis | Entire | 1 | Not Listed |
| Parrot, ground | Pezoporus wallicus | Entire | Foreign | E |
| Parrot, imperial | Amazona imperialis | Entire | Foreign | E |
| Parrot, night (=Australian) | Geopsittacus occidentalis | Entire | Foreign | E |
| Parrot, Puerto Rican | Amazona vittata | Entire | 4 | E |
| Parrot, red-browed | Amazona rhodocorytha | Entire | Foreign | E |
| Parrot, red-capped | Pionopsitta pileata | Entire | Foreign | E |
| Parrot, red-crowned | Amazona viridigenalis | Entire | 2 | C |
| Parrot, red-necked | Amazona arausiaca | Entire | Foreign | E |
| Parrot, red-spectacled | Amazona pretrei pretrei | Entire | Foreign | E |
| Parrot, red-tailed | Amazona brasiliensis | Entire | Foreign | E |
| Parrot, Seychelles lesser vasa | Coracopsis nigra barklyi | Entire | Foreign | E |
| Parrot, St. Lucia | Amazona versicolor | Entire | Foreign | E |
| Parrot, St Vincent | Amazona guildingii | Entire | Foreign | E |
| Parrot, thick-billed | Rhynchopsitta pachyrhyncha | Mexico | Foreign | E |
| Parrot, vinaceous-breasted | Amazona vinacea | Entire | Foreign | E |
| Parrot, yellow-billed | Amazona collaria | Entire | Foreign | PT |
| Parrya, Rydberg | Parrya rydbergii | 6 | Not Listed | |
| Parsley, hemlock, Mexican | Conioselinum mexicanum | 2 | Not Listed | |
| parsley Pikes Peak Spring | Oreoxis humilis | 6 | Not Listed | |
| Partridge, Italian grey | Perdix perdix italica | Entire | Foreign | UR |
| Parula, tropical | Parula pitiayumi nigrilora | Entire | 2 | Not Listed |
| Pauoa | Ctenitis squamigera | 1 | E | |
| Pawpaw, beautiful | Deeringothamnus pulchellus | 4 | E | |
| Pawpaw, four-petal | Asimina tetramera | 4 | E | |
| Pawpaw, Rugel's | Deeringothamnus rugelii | 4 | E | |
| Pea, Big Pine partridge | Chamaecrista lineata keyensis | 4 | C | |
| Peaclam, Sangre de Cristo | Pisidium sanquinichristi | Entire | 2 | Not Listed |
| Peaclam, [unnamed] | Pisidium ultramontanum | Entire | 1 | Not Listed |
| Pearlshell, Alabama | Margaritifera marrianae | Entire | 4 | PE |
| Pearlshell, Louisiana | Margaritifera hembeli | Entire | 4 | T |
| Pearlymussel, birdwing | Conradilla caelata | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Pearlymussel, birdwing | Conradilla caelata | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Pearlymussel, birdwing | Conradilla caelata | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Pearlymussel, cracking | Hemistena lata | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Pearlymussel, cracking | Hemistena lata | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Pearlymussel, cracking | Hemistena lata | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Pearlymussel, Curtis | Epioblasma florentina curtisii | Entire | 3 | E |
| Pearlymussel, dromedary | Dromus dromas | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Pearlymussel, dromedary | Dromus dromas | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Pearlymussel, dromedary | Dromus dromas | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Pearlymussel, littlewing | Pegias fabula | Entire | 4 | E |
| Pearlymussel, Nicklin's | Megalonaias nicklineana | Entire | Foreign | E |
| Pearlymussel, Sampson's | Epioblasma sampsoni | Entire | 3 | D3A |
| Pearlymussel, slabside | Lexingtonia dolabelloides | Entire | 4 | C |
| Pearlymussel, Tampico | Cyrtonaias tampicoensis tecomatensis | Entire | Foreign | E |
| Pea, Torrey's | Lathyrus torreyi | 1 | Not Listed | |
| Pebblesnail, angular | Somatogyrus biangulatus | Entire | 4 | Not Listed |
| Pebblesnail, Ash Meadows | Pyrgulopsis erythropoma | Entire | 8 | UR |
| Pebblesnail, Atlas | Somatogyrus humerosus | Entire | 4 | Not Listed |
| Pebblesnail, Cahaba | Clappia cahabensis | Entire | 4 | Not Listed |
| Pebblesnail, Cahaba | Clappia umbilicata | Entire | 4 | Not Listed |
| Pebblesnail, channeled | Somatogyrus wheeleri | Entire | 4 | Not Listed |
| Pebblesnail, Columbia | Fluminicola columbianus | Entire | 1 | Not Listed |
| Pebblesnail, Coosa | Somatogyrus coosaensis | Entire | 4 | Not Listed |
| Pebblesnail, Diminuitive | Fluminicola sp | Entire | 1 | UR |
| Pebblesnail, dwarf | Somatogyrus nanus | Entire | 4 | Not Listed |
| Pebblesnail, flat | Lepyrium showalteri | Entire | 4 | E |
| Pebblesnail, fluted | Somatogyrus hendersoni | Entire | 4 | Not Listed |
| Pebblesnail, globular | Fluminicola sph | Entire | 8 | UR |
| Pebblesnail, golden | Somatogyrus aureus | Entire | 4 | Not Listed |
| Pebblesnail, Goose Valley | Fluminicola anserinus | Entire | 8 | UR |
| Pebblesnail, granite | Somatogyrus hinkleyi | Entire | 4 | Not Listed |
| Pebblesnail, Hat Creek | Fluminicola umbilicatus | Entire | 8 | UR |
| Pebblesnail, hidden | Somatogyrus deciphens | Entire | 4 | Not Listed |
| Pebblesnail, knotty | Somatogyrus constrictus | Entire | 4 | Not Listed |
| Pebblesnail, Moapa | Pyrgulopsis avernalis | Entire | 8 | UR |
| Pebblesnail, moon | Somatogyrus obtusus | Entire | 4 | Not Listed |
| Pebblesnail, mud | Somatogyrus sargenti | Entire | 4 | Not Listed |
| Pebblesnail, Nerite | Fluminicola spc | Entire | 1 | UR |
| Pebblesnail, nugget | Fluminicola seminalis | Entire | 8 | UR |
| Pebblesnail, Oachita | Somatogyrus amnicoloides | Entire | 4 | Not Listed |
| Pebblesnail, opaque | Somatogyrus tennesseensis | Entire | 4 | Not Listed |
| Pebblesnail, ovate | Somatogyrus excavatus | Entire | 4 | Not Listed |
| Pebblesnail, Pahranagat | Pyrgulopsis merriami | Entire | 8 | UR |
| Pebblesnail, Panhandle | Somatogyrus virginicus | Entire | 4 | Not Listed |
| Pebblesnail, Potem Creek | Fluminicola potemicus | Entire | 8 | UR |
| Pebblesnail, pygmy | Somatogyrus pygmaeus | Entire | 4 | Not Listed |
| Pebblesnail, quadrate | Somatogyrus quadratus | Entire | 4 | Not Listed |
| Pebblesnail, rolling | Somatogyrus strengi | Entire | 4 | Not Listed |
| Pebblesnail, Savannah | Somatogyrus tenax | Entire | 4 | Not Listed |
| Pebblesnail, Shasta | Fluminicola multifarius | Entire | 8 | UR |
| Pebblesnail, sparrow | Somatogyrus parvulus | Entire | 4 | Not Listed |
| Pebblesnail, stocky | Somatogyrus crassus | Entire | 4 | Not Listed |
| Pebblesnail, tall | Fluminicola spk | Entire | 1 | UR |
| Pebblesnail, Tallapoosa | Somatogyrus pilsbryanus | Entire | 4 | Not Listed |
| Pebblesnail, Tennessee | Somatogyrus currierianus | Entire | 4 | Not Listed |
| Pebblesnail, thick-lipped | Somatogyrus crassilabris | Entire | 4 | Not Listed |
| pelican, American white | pelecanus erythrorhynchos | Entire | 7 | Not Listed |
| Pelican, brown | Pelecanus occidentalis | Entire, except U.S. Atlantic coast, FL, AL | 8 | DM |
| Pelican, brown | Pelecanus occidentalis | U.S. Atlantic coast, FL, AL | 4 | DM |
| pelican, Brown | pelecanus occidentalis ssp. occidentalis | Entire | 6 | Not Listed |
| Pelos del diablo | Aristida portoricensis | 4 | E | |
| penguin, African | Spheniscus demersus | Entire | 9 | E |
| penguin, eastern rockhopper | Eudyptes chrysocome filholi | Entire | Foreign | Not Listed |
| penguin, emperor | Aptenodytes forsteri | Entire | Foreign | Not Listed |
| penguin, erect-crested | Eudyptes sclateri | Entire | Foreign | T |
| penguin, fiordland crested | Eudyptes pachyrhynchus | Entire | Foreign | T |
| Penguin, Galapagos | Spheniscus mendiculus | Entire | Foreign | E |
| penguin, Humboldt | Spheniscus humboldti | Entire | Foreign | T |
| penguin, macaroni | Eudyptes chrysolophus | Campbell Plateau portion of New Zealand/Australia population | 9 | Not Listed |
| penguin, northern rockhopper | Eudyptes moseleyi | Entire | Foreign | Not Listed |
| penguin, royal | Eudyptes schlegeli | Entire | Foreign | Not Listed |
| penguin, snares crested | Eudyptes robustus | Entire | Foreign | Not Listed |
| penguin, southern rockhopper | Eudyptes chrysocome | New Zealand-Australia DPS, associated with the Campbell Plateau and Macquarie Island | 9 | T |
| penguin, white-flippered | Eudyptula albosignata | Entire | Foreign | T |
| penguin, yellow-eyed | Megadyptes antipodes | Entire | Foreign | T |
| Penny-cress, Kneeland Prairie | Thlaspi californicum | 8 | E | |
| Pennyroyal, Flagstaff | Hedeoma diffusum | 2 | Not Listed | |
| Pennyroyal, Mckittrick | Hedeoma apiculatum | 2 | DP | |
| Pennyroyal, mock | Hedeoma graveolens | 4 | Not Listed | |
| Pennyroyal, Old Blue mock | Hedeoma pilosum | 2 | Not Listed | |
| Pennyroyal, Todsen's | Hedeoma todsenii | 2 | E | |
| Penstemon, Amargosa | Penstemon fruticiformis amargosae | 1 | Not Listed | |
| Penstemon, ash | Penstemon cinicola | 1 | Not Listed | |
| Penstemon, blowout | Penstemon haydenii | 6 | E | |
| Penstemon, California | Penstemon californicus | 1 | Not Listed | |
| Penstemon, Idaho | Penstemon idahoensis | 1 | Not Listed | |
| Penstemon, Inyo | Penstemon papillatus | 1 | Not Listed | |
| Penstemon, limestone | Penstemon calcareus | 1 | Not Listed | |
| Penstemon, thread-leaved | Penstemon filiformis | 1 | Not Listed | |
| Penstemon, white-margined | Penstemon albomarginatus | 1 | Not Listed | |
| Pentachaeta, Lyon's | Pentachaeta lyonii | 8 | E | |
| Pentachaeta, slender | Pentachaeta exilis aeolica | 1 | Not Listed | |
| Pentachaeta, white-rayed | Pentachaeta bellidiflora | 8 | E | |
| Peperomia, Wheeler's | Peperomia wheeleri | 4 | E | |
| Pepper cress, Davis' | Lepidium davisii | 1 | Not Listed | |
| Peppergrass, Borrego Valley | Lepidium flavum felipense | 1 | Not Listed | |
| Pepper-grass, Heckard's Dwarf | Lepidium latipes var. heckardii | 1 | Not Listed | |
| Peppergrass, Jared's | Lepidium jaredii jaredii | 1 | Not Listed | |
| Peppergrass, kodachrome | Lepidium montanum stellae | 6 | Not Listed | |
| Peppergrass, Ostler's | Lepidium ostleri | 6 | C | |
| Peppergrass, Panoche | Lepidium jaredii album | 1 | Not Listed | |
| pepper-grass, Robinson's | lepidium virginicum var. robinsonii | 2 | Not Listed | |
| Peppergrass, Slickspot | Lepidium papilliferum | 1 | T | |
| Pepperwort Huber's | Lepidium huberi | 6 | Not Listed | |
| Pepperwort Thickleaf | Lepidium integrifolium | 6 | Not Listed | |
| Perch, Sacramento | Archoplites interruptus | Entire | 1 | Not Listed |
| Petrel, Beck's | Pterodroma becki | Entire | NA | Not Listed |
| petrel, Bermuda | Pterodroma cahow | Entire | Foreign | E |
| Petrel, black-capped | Pterodroma hasitata | Entire | 4 | Not Listed |
| Petrel, Chatham Island | Pterodroma axillaris | Entire | Foreign | E |
| Petrel, Cook's | Pterodroma cookii | Entire | 9 | PT |
| Petrel, Fiji | Pterodroma macgillivrayi | Entire | Foreign | E |
| Petrel, Galapagos | Pterodroma phaeopygia | Entire | Foreign | T |
| Petrel, Hawaiian dark-rumped | Pterodroma phaeopygia sandwichensis | Entire | 1 | E |
| Petrel, Magenta | Pterodroma magentae | Entire | Foreign | E |
| Petrel, Mascarene black | Pterodroma aterrima | Entire | Foreign | E |
| Petrel, Parkinson's black | Procellaria parkinsoni | Entire | Foreign | UR |
| Phacelia, ashy | Phacelia cinerea | 1 | Not Listed | |
| Phacelia, Aven Nelson's | Phacelia anelsonii | 1 | Not Listed | |
| Phacelia, Beatley | Phacelia beatleyae | 1 | Not Listed | |
| Phacelia, Brand's | Phacelia stellaris | 8 | C | |
| Phacelia, Charlotte's | Phacelia nashiana | 1 | Not Listed | |
| Phacelia, cinder | Phacelia serrata | 2 | Not Listed | |
| Phacelia, clay | Phacelia argillacea | 6 | E | |
| Phacelia, Cooke's | Phacelia cookei | 1 | Not Listed | |
| Phacelia, DeBeque | Phacelia submutica | 6 | T | |
| Phacelia, drab | Phacelia indecora | 6 | Not Listed | |
| Phacelia, Howell | Phacelia howelliana | 6 | Not Listed | |
| Phacelia, island | Phacelia insularis ssp. insularis | 8 | E | |
| Phacelia, Merced | Phacelia ciliata opaca | 1 | Not Listed | |
| Phacelia, Mono | Phacelia monoensis | 1 | Not Listed | |
| Phacelia, mountain | Phacelia orogenes | 1 | Not Listed | |
| Phacelia, Mt. Diablo | Phacelia phacelioides | 1 | Not Listed | |
| Phacelia, Nine Mile Canyon | Phacelia novenmillensis | 1 | Not Listed | |
| Phacelia, Nipple Bench | Phacelia mammillarensis | 6 | Not Listed | |
| Phacelia, northcoast | Phacelia insularis continentis | 1 | Not Listed | |
| Phacelia, North Park | Phacelia formosula | 6 | E | |
| Phacelia, pale | Phacelia pallida | 2 | Not Listed | |
| Phacelia, Parish's | Phacelia parishii | 1 | Not Listed | |
| Phacelia, round leaf, Death Valley | Phacelia mustelina | 1 | Not Listed | |
| Phacelia, Saline Valley | Phacelia amabilis | 1 | Not Listed | |
| Phacelia, sand dune | Phacelia argentea | 1 | Not Listed | |
| Phacelia, Santiago Peak | Phacelia suaveolens keckii | 1 | Not Listed | |
| Phacelia, Scott Valley | Phacelia greenei | 1 | Not Listed | |
| Phacelia, southern island | Phacelia floribunda | 1 | Not Listed | |
| Phacelia, Stebbins' | Phacelia stebbinsii | 1 | Not Listed | |
| Phacelia, sticky | Phacelia lenta | 1 | Not Listed | |
| Phacelia, Trinity | Phacelia dalesiana | 1 | Not Listed | |
| Phacelia, [unnamed] | Phacelia capitata | 1 | Not Listed | |
| Phacelia, [unnamed] | Phacelia demissa heterotricha | 6 | Not Listed | |
| Phacelia, [unnamed] | Phacelia filiformis | 2 | Not Listed | |
| Phacelia, [unnamed] | Phacelia minutissima | 1 | Not Listed | |
| Phacelia, [unnamed] | Phacelia rafaelensis | 6 | Not Listed | |
| Phacelia, Utah | Phacelia utahensis | 6 | Not Listed | |
| Phacelia, virgin | Phacelia cephalotes | 6 | Not Listed | |
| Phacelia, Welsh | Phacelia welshii | 2 | Not Listed | |
| phainopepla | phainopepla nitens | Entire | 6 | Not Listed |
| Pheasant, bar-tailed | Syrmaticus humaie | Entire | Foreign | E |
| Pheasant, Blyth's tragopan | Tragopan blythii | Entire | Foreign | E |
| Pheasant, brown eared | Crossoptilon mantchuricum | Entire | Foreign | E |
| Pheasant, Cabot's tragopan | Tragopan caboti | Entire | Foreign | E |
| Pheasant, cheer | Catreus wallichii | Entire | Foreign | E |
| Pheasant, Chinese monal | Lophophorus lhuysii | Entire | Foreign | E |
| Pheasant, Edward's | Lophura edwardsi | Entire | Foreign | E |
| Pheasant, Elliot's | Syrmaticus ellioti | Entire | Foreign | E |
| Pheasant, imperial | Lophura imperialis | Entire | Foreign | E |
| Pheasant, Mikado | Syrmaticus mikado | Entire | Foreign | E |
| Pheasant, Palawan peacock | Polyplectron emphanum | Entire | Foreign | E |
| Pheasant, Sclater's monal | Lophophorus sclateri | Entire | Foreign | E |
| Pheasant, Swinhoe's | Lophura swinhoii | Entire | Foreign | E |
| Pheasant, western tragopan | Tragopan melanocephalus | Entire | Foreign | E |
| Pheasant, white eared | Crossoptilon crossoptilon | Entire | Foreign | E |
| Phlox, Bear Valley | Phlox dolichantha | 1 | Not Listed | |
| Phlox, Clearwater | Phlox idahonis | 1 | Not Listed | |
| Phlox, cleft, | Phlox bifida stellaria | 3 | Not Listed | |
| Phlox, long-haired | Phlox pilosa longipilosa | 2 | Not Listed | |
| Phlox, Navajo Mountain | Phlox cluteana | 2 | Not Listed | |
| Phlox, Oklahoma | Phlox oklahomensis | 2 | Not Listed | |
| Phlox, Red Canyon | Phlox gladiformis | 1 | Not Listed | |
| Phlox, Texas trailing | Phlox nivalis ssp. texensis | 2 | E | |
| Phlox, [unnamed] | Phlox caryophylla | 2 | Not Listed | |
| Phlox, [unnamed] | Phlox grahamii | 6 | Not Listed | |
| Phlox, [unnamed] | Phlox jonesii | 6 | Not Listed | |
| Phlox, [unnamed] | Phlox missoulensis | 6 | Not Listed | |
| Phlox, [unnamed] | Phlox mollis | 1 | Not Listed | |
| Phlox, [unnamed] | Phlox pulchra | 4 | Not Listed | |
| Phlox, [unnamed] | Phlox pungens | 6 | Not Listed | |
| Phlox, Yreka | Phlox hirsuta | 8 | E | |
| Phyllostegia, Yamaguchi | Phyllostegia yamaguchii | 1 | Not Listed | |
| Physa, cave | Physella spelunca | Entire | 6 | Not Listed |
| Physa, Fish Lake | Physella microstriata | Entire | 6 | Not Listed |
| Physa, Utah | Physella utahensis | Entire | 6 | Not Listed |
| Physa, wet-rock | Physella zionis | Entire | 6 | Not Listed |
| Pigeon, Azores wood | Columba palumbus azorica | Entire | Foreign | E |
| pigeon, Band-tailed | patagioenas fasciata | Entire | 1 | Not Listed |
| Pigeon, Chatham Island | Hemiphaga novaeseelandiae chathamensis | Entire | Foreign | E |
| Pigeon, Marquesas | Ducula galeata | Entire | 9 | E |
| Pigeon, Mindoro imperial (=zone-tailed) | Ducula mindorensis | Entire | Foreign | E |
| Pigeon, Palau Nicobar | Caloenas nicobarensis pelewensis | Entire | 1 | Not Listed |
| Pigeon, pink | Columba mayeri | Entire | Foreign | E |
| Pigeon, Puerto Rican plain | Columba inornata wetmorei | Entire | 4 | E |
| Pigeon, Radak Micronesian | Ducula oceanica ratakensis | Entire | Foreign | Not Listed |
| Pigeon, Truk Micronesian | Ducula oceanica teraoki | Entire | Foreign | Not Listed |
| Pigeon, white-crowned | Columba leucocephala | Entire | 4 | Not Listed |
| Pigeon, white-tailed laurel | Columba junoniae | Entire | Foreign | T |
| Pigeon wings | Clitoria fragrans | 4 | T | |
| Pigtoe, Atlantic | Fusconaia masoni | Entire | 4 | Not Listed |
| Pigtoe, Cumberland | Pleurobema gibberum | Entire | 4 | E |
| Pigtoe, dark | Pleurobema furvum | Entire | 4 | E |
| Pigtoe, finerayed | Fusconaia cuneolus | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Pigtoe, finerayed | Fusconaia cuneolus | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Pigtoe, finerayed | Fusconaia cuneolus | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Pigtoe, flat | Pleurobema marshalli | Entire | 4 | E |
| Pigtoe, fuzzy | Pleurobema strodeanum | Entire | 4 | PT |
| Pigtoe, Georgia | Pleurobema hanleyianum | Entire | 4 | E |
| Pigtoe, heavy | Pleurobema taitianum | Entire | 4 | E |
| Pigtoe, narrow | Fusconaia escambia | Entire | 4 | PT |
| Pigtoe, oval | Pleurobema pyriforme | Entire | 4 | E |
| Pigtoe, pink | Pleurobema pyramidatum | Entire | 4 | Not Listed |
| Pigtoe, pink | Pleurobema rubrum | Entire | 4 | Not Listed |
| Pigtoe, rough | Pleurobema plenum | Entire | 4 | E |
| Pigtoe, rough | Pleurobema plenum | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Pigtoe, shiny | Fusconaia cor | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Pigtoe, shiny | Fusconaia cor | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Pigtoe, shiny | Fusconaia cor | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Pigtoe, southern | Pleurobema georgianum | Entire | 4 | E |
| Pigtoe, Suwannee | Quincuncina kleiniana | Entire | 4 | Not Listed |
| Pigtoe, tapered | Fusconaia burkei | Entire | 4 | PT |
| Pigtoe, true | Pleurobema verum | Entire | 4 | Not Listed |
| Pigtoe, warrior | Pleurobema rubellum | Entire | 4 | Not Listed |
| pika, American | Ochotona princeps | Entire | 1 | Not Listed |
| Pika, Barnes' | Ochotona princeps barnesi | Entire | 6 | Not Listed |
| Pika, Cinnamon | Ochotona princeps cinnamomea | Entire | 6 | Not Listed |
| Pika, Copenhagen Basin | Ochotona princeps clamosa | Entire | 1 | Not Listed |
| Pika, Goat Peak | Ochotona princeps nigrescens | Entire | 2 | Not Listed |
| Pika, Heliotrope | Ochotona princeps moorei | Entire | 6 | Not Listed |
| Pika, La Sal | Ochotona princeps lasalensis | Entire | 6 | Not Listed |
| Pika, Wasatch | Ochotona princeps wasatchensis | Entire | 6 | Not Listed |
| Pike, blue | Stizostedion vitreum glaucum | Entire | 3 | D3A |
| Pikeminnow (=squawfish), Colorado | Ptychocheilus lucius | Entire, except Salt and Verde R. drainages, AZ | 6 | E |
| Pikeminnow (=squawfish), Colorado | Ptychocheilus lucius | Salt and Verde R. drainages, AZ | 6 | EXPN |
| Pillsnail, carinate | Euchemotrema hubrichti | Entire | 3 | Not Listed |
| Pillsnail, palmetto | Euchemotrema cheatumi | Entire | 2 | Not Listed |
| Pilo | Hedyotis mannii | 1 | E | |
| Pilo kea lau li`i | Platydesma rostrata | 1 | E | |
| Pilostyles, Thurber's | Pilostyles thurberi | 2 | Not Listed | |
| Pimpernel, mountain | Taenidia montana | 5 | Not Listed | |
| Pimpleback, orangefoot (pearlymussel) | Plethobasus cooperianus | Entire | 4 | E |
| Pimpleback, orangefoot (pearlymussel) | Plethobasus cooperianus | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Pimpleback, smooth | Quadrula houstonensis | Entire | 2 | C |
| Pimpleback, Texas | Quadrula petrina | Entire | 2 | C |
| Pincushion cactus, Guadalupe | Escobaria guadalupensis | 2 | Not Listed | |
| Pincushion cactus, Villard's | Escobaria villardii | 2 | Not Listed | |
| pincushionplant, Myers' | Navarretia myersii ssp. deminuta | 8 | Not Listed | |
| pincushionplant, prostrate | Navarretia prostrata | 1 | Not Listed | |
| pincushionplant, Tehama | Navarretia heterandra | 6 | Not Listed | |
| Pine, Bolander's beach | Pinus contorta bolanderi | 1 | Not Listed | |
| Pine-foot, California | Pityopus californicus | 1 | Not Listed | |
| Pine, Monterey | Pinus radiata | 1 | Not Listed | |
| Pine, Ponderosa | Pinus ponderosa | 2 | Not Listed | |
| Pinesap, sweet | Monotropsis reynoldsiae | 4 | Not Listed | |
| Pine, Torrey, Del Mar | Pinus torreyana torreyana | 1 | Not Listed | |
| Pine, Torrey Island | Pinus torreyana insularis | 1 | Not Listed | |
| Pine, undescribed | Pinus | NA | Not Listed | |
| Pine, whitebark | Pinus albicaulis | 6 | C | |
| Pinkroot, gentian | Spigelia gentianoides | 4 | E | |
| Pinkroot, [unnamed] | Spigelia loganioides | 4 | Not Listed | |
| Pink, swamp | Helonias bullata | 5 | T | |
| Pinkweed, Lake Erie | Polygonum pensylvanicum eglandulosum | 3 | Not Listed | |
| Pinon | Tillandsia lineatispica | 4 | Not Listed | |
| Pinon espinoso or cockspur | Erythrina eggersii | 4 | Not Listed | |
| Pintail, lesser white-cheeked | Anas bahamensis bahamensis | Entire | 4 | Not Listed |
| Pintail, white-cheeked | Anas bahamensis | Puerto Rico | NA | Not Listed |
| Pinweed, beach, Virginian | Lechea maritima virginica | 5 | Not Listed | |
| Pinweed, Chisos | Lechea mensalis | 2 | Not Listed | |
| Piperia, Yadon's | Piperia yadonii | 8 | E | |
| Pipewort, Blackbract | Eriocaulon nigrobracteatum | 4 | Not Listed | |
| Pipewort, Parker's | Eriocaulon parkeri | 5 | Not Listed | |
| Pipewort, small-headed | Eriocaulon kornickianum | 4 | Not Listed | |
| Piping-guan, black-fronted | Pipile jacutinga | Entire | Foreign | E |
| pipistrelle, Western | pipistrellus hesperus | Entire | 6 | Not Listed |
| Pipit, Sprague's | Anthus spragueii | Entire | 6 | C |
| Piratebush | Buckleya distichophylla | 4 | Not Listed | |
| Pitaya, Correll's green | Echinocereus viridiflorus correllii | 2 | Not Listed | |
| Pitaya, Davis' green | Echinocereus viridiflorus var. davisii | 2 | E | |
| Pitcher-plant, Alabama canebrake | Sarracenia rubra alabamensis | 4 | E | |
| Pitcherplant, California | Darlingtonia californica | 1 | Not Listed | |
| Pitcher-plant, green | Sarracenia oreophila | 4 | E | |
| Pitcher-plant, mountain sweet | Sarracenia rubra ssp. jonesii | 4 | E | |
| Pitcher-plant, parrot | Sarracenia psittacina | 4 | Not Listed | |
| Pitcher-plant, sweet, red-flowered | Sarracenia rubra rubra | 4 | Not Listed | |
| Pitcher-plant, [unnamed] | Sarracenia leucophylla | 4 | Not Listed | |
| Pitcher-plant, [unnamed] | Sarracenia rubra wherryi | 4 | Not Listed | |
| Pitcher-sage, Gander's | Lepechinia ganderi | 1 | Not Listed | |
| Pitcher-sage, heart-leaved | Lepechinia cardiophylla | 1 | Not Listed | |
| Pitta, Gurney's | Pitta gurneyi | Entire | Foreign | E |
| Pitta, Koch's | Pitta kochi | Entire | Foreign | E |
| Pixie-moss, Well's | Pyxidanthera barbulata brevifolia | 4 | Not Listed | |
| Planarian, Bigger's groundwater | Sphalloplana subtilis | 5 | Not Listed | |
| Planarian, Culver's | Sphalloplana culveri | 5 | Not Listed | |
| Planarian, Holsinger's groundwater | Sphalloplana holsingeri | 5 | Not Listed | |
| Planarian, Refton Cave | Sphalloplana pricei | 5 | Not Listed | |
| Planarian, [unnamed] | Kenkia glandulosa | 3 | Not Listed | |
| Planarian, [unnamed] | Kenkia rhynchida | 1 | Not Listed | |
| Planarian, [unnamed] | Procotyla typhlops | 5 | Not Listed | |
| Planarian, [unnamed] | Sphalloplana virginiana | 5 | Not Listed | |
| Planigale, little | Planigale ingrami subtilissima | Entire | Foreign | E |
| Planigale, southern | Planigale tenuirostris | Entire | Foreign | E |
| Plantain, heart-leaved | Plantago cordata | 4 | Not Listed | |
| Plantain, pineland | Plantago sparsiflora | 4 | Not Listed | |
| Plantcutter, Peruvian | Phytotoma raimondii | Entire | 9 | PE |
| Planthopper, Barber's Point oliarus | Oliarus myoporicola | Entire | 1 | Not Listed |
| Planthopper, Bridewell's nesosydne | Nesosydne bridwelli | Entire | 1 | Not Listed |
| Planthopper, Diamond Head nesosydne | Nesosydne leahi | Entire | 1 | Not Listed |
| Planthopper, Glenwood nesosydne | Nesosydne cyrtandricola | Entire | 1 | Not Listed |
| Planthopper, Iao Valley nesosydne | Nesosydne acuta | Entire | 1 | Not Listed |
| Planthopper, Kauai parti-colored oliarus | Oliarus consimilis | Entire | 1 | Not Listed |
| Planthopper, Keanae nesosydne | Nesosydne sulcata | Entire | 1 | Not Listed |
| Planthopper, Kusche's nesosydne | Nesosydne kuschei | Entire | 1 | Not Listed |
| Planthopper, Lanai oliarus | Oliarus lanaiensis | Entire | 1 | Not Listed |
| Planthopper, Lihue oliarus | Oliarus lihue | Entire | 1 | Not Listed |
| Planthopper, long-footed nesosydne | Nesosydne longipes | Entire | 1 | Not Listed |
| Planthopper, Mt. Tantalus short-wing fern | Nesorestias filicicola | Entire | 1 | Not Listed |
| Planthopper, Nahiku nesosydne | Nesosydne cyrtandrae | Entire | 1 | Not Listed |
| Planthopper, oliarus wild cotton | Oliarus discrepans | Entire | 1 | Not Listed |
| Planthopper, priolan oliarus | Oliarus priola | Entire | 1 | Not Listed |
| Plover, mountain | Charadrius montanus | Entire | 6 | Not Listed |
| Plover, New Zealand shore | Thinornis novaeseelandiae | Entire | Foreign | E |
| Plover, piping | Charadrius melodus | Entire, except those areas where listed as endangered above | 5 | T |
| Plover, piping | Charadrius melodus | Great Lakes watershed in States of IL, IN, MI, MN, NY, OH, PA, and WI and Canada (Ont.) | 3 | E |
| Plover, southeastern snowy | Charadrius alexandrinus tenuirostris | Entire | 4 | Not Listed |
| Plover, western snowy | Charadrius alexandrinus nivosus | U.S.A. (CA, OR, WA), Mexico (within 50 miles of Pacific coast) | 8 | T |
| Plum, Alleghany | Prunus alleghaniensis | 5 | Not Listed | |
| Plum, beach, Grave's | Prunus maritima gravesii | 5 | Not Listed | |
| Plume, Georgia | Elliottia racemosa | 4 | Not Listed | |
| Plum, scrub | Prunus geniculata | 4 | E | |
| Plymouth Red-Bellied Turtle | Pseudemys rubriventris bangsi | Entire | 5 | E |
| Pochard, Madagascar | Aythya innotata | Entire | Foreign | E |
| Pocketbook, fat | Potamilus capax | Entire | 4 | E |
| Pocketbook, finelined | Lampsilis altilis | Entire | 4 | T |
| Pocketbook, lined | Lampsilis binominata | Entire | 4 | Not Listed |
| Pocketbook, Ouachita rock | Arkansia wheeleri | Entire | 2 | E |
| Pocketbook, shinyrayed | Lampsilis subangulata | Entire | 4 | E |
| Pocketbook, speckled | Lampsilis streckeri | Entire | 4 | E |
| Pocket gopher, Amargosa southern | Thomomys umbrinus amargosae | Entire | 1 | Not Listed |
| Pocket gopher, Animas southern | Thomomys umbrinus emotus | Entire | 2 | Not Listed |
| Pocket gopher, Antelope Island | Thomomys umbrinus nesophilus | Entire | 6 | Not Listed |
| Pocket gopher, Baker's Llano | Geomys texensis bakeri | Entire | 2 | Not Listed |
| Pocket gopher, Bonneville southern | Thomomys umbrinus bonnevillei | Entire | 6 | Not Listed |
| pocket gopher, Brush Prairie | Thomomys mazama ssp. oregonus | Entire | 1 | C |
| Pocket gopher, Carrizo Springs Texas | Geomys personatus streckeri | Entire | 2 | Not Listed |
| Pocket gopher, Cebolleta southern | Thomomys umbrinus paguatae | Entire | 2 | Not Listed |
| Pocket gopher, Clear Lake | Thomomys umbrinus convexus | Entire | 6 | Not Listed |
| Pocket gopher, Colonial | Geomys colonus | Entire | 4 | Not Listed |
| Pocket gopher, Cumberland | Geomys cumberlandius | Entire | 4 | Not Listed |
| Pocket gopher, desert | Geomys bursarius arenarius | Entire | 2 | Not Listed |
| pocket gopher, Douglas County | Thomomys talpoides macrotis | entire | 6 | Not Listed |
| Pocket gopher, Fish Spring | Thomomys umbrinus abstrusus | Entire | 1 | Not Listed |
| Pocket gopher, Goff's southeastern | Geomys pinetis goffi | Entire | 4 | Not Listed |
| Pocket gopher, Goldbeach western | Thomomys mazama helleri | Entire | 1 | Not Listed |
| Pocket gopher, Graham Mountains | Thomomys umbrinus grahamensis | Entire | 2 | Not Listed |
| Pocket gopher, Guadalupe southern | Thomomys umbrinus guadalupensis | Entire | 2 | Not Listed |
| Pocket gopher, Harquahala southern | Thomomys umbrinus subsimilis | Entire | 2 | Not Listed |
| Pocket gopher, Hualapai southern | Thomomys umbrinus hualpaiensis | Entire | 2 | Not Listed |
| Pocket gopher, Limpia Creek | Thomomys umbrinus texensis | Entire | 2 | Not Listed |
| Pocket gopher, Limpia southern | Thomomys umbrinus limpiae | Entire | 2 | Not Listed |
| Pocket gopher, Louie's western | Thomomys mazama louiei | Entire | 1 | C |
| Pocket gopher, maritime Texas | Geomys personatus maritimus | Entire | 2 | Not Listed |
| Pocket gopher, Mearns' southern | Thomomys umbrinus mearnsi | Entire | 2 | Not Listed |
| Pocket gopher, Mer Rouge | Geomys bursarius breviceps | Entire | 4 | Not Listed |
| Pocket gopher, Mount Ellen | Thomomys umbrinus dissimilis | Entire | 6 | Not Listed |
| Pocket gopher, Olympia | Thomomys mazama pugetensis | Entire | 1 | C |
| Pocket gopher, Olympic | Thomomys mazama melanops | Entire | 1 | C |
| Pocket gopher, Pajarito southern | Thomomys umbrinus quercinus | Entire | 2 | Not Listed |
| Pocket gopher, Pistol River | Thomomys umbrinus detumidus | Entire | 1 | Not Listed |
| Pocket gopher, Prospect Valley | Thomomys umbrinus muralis | Entire | 2 | Not Listed |
| Pocket gopher, Roy Prairie | Thomomys mazama glacialis | Entire | 1 | C |
| Pocket gopher, Salt Gulch | Thomomys umbrinus powelli | Entire | 6 | Not Listed |
| Pocket gopher, San Antonio | Thomomys umbrinus curtatus | Entire | 1 | Not Listed |
| Pocket gopher, Searchlight southern | Thomomys umbrinus suboles | Entire | 2 | Not Listed |
| Pocket gopher, Shelton | Thomomys mazama ssp. couchi | Entire | 1 | C |
| Pocket gopher, Sherman's southeastern | Geomys pinetis fontanelus | Entire | 4 | Not Listed |
| Pocket gopher, Skull Valley | Thomomys umbrinus robustus | Entire | 6 | Not Listed |
| Pocket gopher, Stansbury Island | Thomomys umbrinus minimus | Entire | 6 | Not Listed |
| Pocket gopher, Swasey Spring | Thomomys umbrinus sevieri | Entire | 6 | Not Listed |
| Pocket gopher, Tacoma western | Thomomys mazama tacomensis | Entire | 1 | C |
| Pocket gopher, Tenino | Thomomys mazama tumuli | Entire | 1 | C |
| Pocket gopher, White Sands | Geomys arenarius brevirostris | Entire | 2 | Not Listed |
| pocket gopher, Wyoming | Thomomys clusius | Entire | 6 | Not Listed |
| Pocket gopher, Yelm | Thomomys mazama yelmensis | Entire | 1 | C |
| Po`e | Portulaca sclerocarpa | 1 | E | |
| Pogogyne, Santa Lucia | Pogogyne clareana | 1 | Not Listed | |
| Pogogyne, small-flowered, Douglas' | Pogogyne douglasii parviflora | 1 | Not Listed | |
| Pogonia, small whorled | Isotria medeoloides | 5 | T | |
| Polygala, Lewton's | Polygala lewtonii | 4 | E | |
| Polygala, tiny | Polygala smallii | 4 | E | |
| Polygonum, Scotts Valley | Polygonum hickmanii | 8 | E | |
| Polypody, dwarf | Grammitis nimbata | 4 | Not Listed | |
| Pomace fly, Lanai | Drosophila lanaiensis | Entire | 1 | Not Listed |
| Pomace fly, [unnamed] | Drosophila aglaia | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila differens | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila hemipeza | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila heteroneura | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila montgomeryi | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila mulli | Entire | 1 | T |
| Pomace fly, [unnamed] | Drosophila musaphila | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila neoclavisetae | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila obatai | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila ochrobasis | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila substenoptera | Entire | 1 | E |
| Pomace fly, [unnamed] | Drosophila tarphytrichia | Entire | 1 | E |
| Pondberry | Lindera melissifolia | 4 | E | |
| Pondsnail, Fat-whorled (=Bonneville) | Stagnicola bonnevillensis | Entire | 6 | Not Listed |
| Pondsnail, thickshell | Stagnicola utahensis | Entire | 6 | Not Listed |
| Pondspice | Litsea aestivalis | 4 | Not Listed | |
| Pondweed, Hill's | Potamogeton hillii | 5 | Not Listed | |
| Pondweed, Little Aguja (=Creek) | Potamogeton clystocarpus | 2 | E | |
| Pondweed, [unnamed] | Potamogeton confervoides | 3 | Not Listed | |
| Pondweed, [unnamed] | Potamogeton ogdenii | 5 | Not Listed | |
| Po`ola | Claoxylon sandwicense sandwicense | 1 | Not Listed | |
| Poolfish, Ash Meadows | Empetrichthys merriami | Entire | 1 | Not Listed |
| Poolfish, Pahrump | Empetrichthys latos | Entire | 8 | E |
| Po`ouli (honeycreeper) | Melamprosops phaeosoma | Entire | 1 | E |
| popcornflower, Austin's | Plagiobothrys austiniae | 6 | Not Listed | |
| popcornflower, Bearded | Plagiobothrys hystriculus | 1 | Not Listed | |
| popcornflower, coral seeded | Plagiobothrys figuratus ssp. corallicarpus | 1 | Not Listed | |
| popcornflower, Greene's | Plagiobothrys greenei | 6 | Not Listed | |
| Popcornflower, Petaluma | Plagiobothrys mollis vestitus | 1 | Not Listed | |
| popcornflower, rough | Plagiobothrys hirtus | 1 | E | |
| Popcornflower, Salinas Valley | Plagiobothrys uncinatus | 1 | Not Listed | |
| Popcornflower, San Francisco | Plagiobothrys diffusus | 1 | Not Listed | |
| popcornflower, Sculptured | Plagiobothrys glyptocarpus var. glyptocarpus | 6 | Not Listed | |
| Popcornflower, [unnamed] | Plagiobothrys lamprocarpus | 1 | Not Listed | |
| Popolo | Cyanea solanacea | 1 | Not Listed | |
| Popolo | Solanum nelsonii | 1 | C | |
| Popolo ku mai | Solanum incompletum | 1 | E | |
| poppy, Coulter's matilija | romneya coulteri | 6 | Not Listed | |
| Poppy, diamond-petaled | Eschscholzia rhombipetala | 1 | Not Listed | |
| Poppy, Island | Eschscholzia ramosa | 1 | Not Listed | |
| Poppy, Kernville | Eschscholzia procera | 1 | Not Listed | |
| Poppy-mallow, Texas | Callirhoe scabriuscula | 2 | E | |
| Poppy-mallow, [unnamed] | Callirhoe bushii | 4 | Not Listed | |
| Poppy, pale | Papaver alboroseum | 7 | Not Listed | |
| Poppy, Sacramento prickly | Argemone pleiacantha ssp. pinnatisecta | 2 | E | |
| Poppy, Walpole | Papaver walpolei | 7 | Not Listed | |
| Porcupine, thin-spined | Chaetomys subspinosus | Entire | Foreign | E |
| Porpoise, Harbor | Phocoena phocoena | Entire | 5 | Not Listed |
| Possum, Leadbeater's | Gymnobelideus leadbeateri | Entire | Foreign | E |
| Possum, mountain pygmy | Burramys parvus | Entire | Foreign | E |
| Possum, scaly-tailed | Wyulda squamicaudata | Entire | Foreign | E |
| Potato-bean, Price's | Apios priceana | 4 | T | |
| Potentilla, Hickman's | Potentilla hickmanii | 8 | E | |
| Prairie-chicken, Attwater's greater | Tympanuchus cupido attwateri | Entire | 2 | E |
| Prairie-chicken, lesser | Tympanuchus pallidicinctus | Entire | 2 | C |
| Prairie-clover, Comanche-peak | Dalea reverchonii | 2 | Not Listed | |
| Prairie-clover, Florida | Dalea carthagenensis floridana | 4 | C | |
| Prairie-clover, Hole-In-The-Rock | Dalea flavescens epica | 6 | Not Listed | |
| Prairie-clover, leafy | Dalea foliosa | 4 | E | |
| Prairie-clover, Sabinal | Dalea sabinalis | 2 | Not Listed | |
| Prairie-clover, [unnamed] | Dalea scariosa | 2 | Not Listed | |
| Prairie dog, Arizona black-tailed | Cynomys ludovicianus arizonensis | Entire | 2 | Not Listed |
| Prairie dog, black-tailed | Cynomys ludovicianus | Entire | 6 | Not Listed |
| Prairie dog, Gunnison's | Cynomys gunnisoni | central and south-central Colorado, north-central New Mexico | 6 | C |
| Prairie dog, Mexican | Cynomys mexicanus | Entire | Foreign | E |
| Prairie dog, Utah | Cynomys parvidens | Entire | 6 | T |
| Prickly-apple, aboriginal | Harrisia (=Cereus) aboriginum (=gracilis) | 4 | C | |
| Prickly-apple, fragrant | Cereus eriophorus var. fragrans | 4 | E | |
| Prickly-apple, Simpson's | Cereus gracilis simpsonii | 4 | Not Listed | |
| Prickly-ash, St. Thomas | Zanthoxylum thomasianum | 4 | E | |
| Prickly-pear, cow-tongue | Opuntia lindheimeri linguiformis | 2 | Not Listed | |
| Prickly-pear, golden-spined | Opuntia aureispina | 2 | Not Listed | |
| Prickly-pear, marble-seeded, few-spined | Opuntia engelmannii flexospina | 2 | Not Listed | |
| Prickly-pear, sand | Opuntia arenaria | 2 | Not Listed | |
| Prickly-phlox, San Jacinto | Leptodactylon jaegeri | 1 | Not Listed | |
| Prickly-poppy, robust | Argemone munita robusta | 1 | Not Listed | |
| primrose Baird's evening | Camissonia bairdii | 6 | Not Listed | |
| Primrose, bird's-eye | Primula mistassinica | 3 | Not Listed | |
| Primrose, Maguire | Primula maguirei | 6 | T | |
| Primrose, North Rim | Primula hunnewellii | 2 | Not Listed | |
| Primrose, [unnamed] | Primula alcalina | 1 | Not Listed | |
| Primrose, [unnamed] | Primula capillaris | 1 | Not Listed | |
| Primrose, [unnamed] | Primula domensis | 6 | Not Listed | |
| Primrose, [unnamed] | Primula nevadensis | 1 | Not Listed | |
| Primrose, [unnamed] | Primula specuicola | 2 | Not Listed | |
| Primrose, [unnamed] | Primula tschuktschorum | 7 | Not Listed | |
| Primrose, [unnamed] | Primula wilcoxiana | 1 | Not Listed | |
| Primrose, Wallowa | Primula cusickiana | 1 | Not Listed | |
| Pronghorn, peninsular | Antilocapra americana peninsularis | Entire | Foreign | E |
| Pronghorn, Sonoran | Antilocapra americana sonoriensis | Entire, except where listed as an experimental population. | 2 | E |
| Pronghorn, Sonoran | Antilocapra americana sonoriensis | U.S.A. (AZ), Mexico In Arizona, an area north of Interstate 8 and south of Interstate 10, bounded by the Colorado River on the west and Interstate 10 on the east; and an area south of Interstate 8, bounded by Highway 85 on the west, Interstates 10 and 19 on the east, and the U.S.- Mexico border on the south. | 2 | EXPN |
| Proterhinid beetles, Hawaiian | Proterhinus spp. (ca 72) | Entire | 1 | Not Listed |
| Pseudoscorpion | Kleptochthonius magnus | Entire | 4 | Not Listed |
| Pseudoscorpion | Kleptochthonius tantalus | Entire | 4 | Not Listed |
| Pseudoscorpion, Aalbu's cave | Archeolarca aalbui | Entire | 1 | Not Listed |
| pseudoscorpion, (Aphrastochthonius) | aphrastochthonius | Entire | 6 | Not Listed |
| Pseudoscorpion, Carlow's Cave | Aphrastochthonius similis | Entire | 1 | Not Listed |
| Pseudoscorpion, Dry Fork Valley cave | Apochthonius paucispinosus | Entire | 5 | Not Listed |
| Pseudoscorpion, Empire Cave | Microcreagris imperialis | Entire | 1 | Not Listed |
| Pseudoscorpion, Grand Canyon cave | Archeolarca cavicola | Entire | 2 | Not Listed |
| Pseudoscorpion, Greenbrier Valley cave | Kleptochthonius henroti | Entire | 5 | Not Listed |
| Pseudoscorpion, Grubbs' cave | Aphrastochthonius grubbsi | Entire | 1 | Not Listed |
| Pseudoscorpion, Guadalupe cave | Archeolarca guadalupensis | Entire | 2 | Not Listed |
| Pseudoscorpion, Lacey's cave | Larca laceyi | Entire | 1 | Not Listed |
| Pseudoscorpion, Malheur | Apochthonius malheuri | Entire | 1 | Not Listed |
| Pseudoscorpion, Music Hall Cave | Pseudogarypus orpheus | Entire | 1 | Not Listed |
| Pseudoscorpion, Organ Cave | Kleptochthonius hetricki | Entire | 5 | Not Listed |
| Pseudoscorpion, Orpheus cave | Kleptochthonius orpheus | Entire | 5 | Not Listed |
| Pseudoscorpion, Proserpina cave | Kleptochthonius proserpinae | Entire | 5 | Not Listed |
| Pseudoscorpion, royal syarinid | Chitrella regina | Entire | 5 | Not Listed |
| pseudoscorpion, (Tartarocreagris) | tartarocreagris | Entire | 6 | Not Listed |
| Pseudoscorpion, Tooth Cave | Tartarocreagris texana | Entire | 2 | E |
| Psyllid, Oahu holio gall | Paurotriozana adaptata | Entire | 1 | Not Listed |
| Ptarmigan, Evermann's rock | Lagopus mutus evermanni | Entire | 7 | Not Listed |
| Ptarmigan, Yunaska rock | Lagopus mutus yunaskensis | Entire | 7 | Not Listed |
| Pua `ala | Brighamia rockii | 1 | E | |
| Pua-hekili | Lysimachia hillebrandii | 1 | Not Listed | |
| Pua-kauhi | Canavalia rockii | 1 | Not Listed | |
| Pualoalo | Hibiscus kokio | 1 | Not Listed | |
| Pudu | Pudu pudu | Entire | Foreign | E |
| puffin, Atlantic | Fratercula arctica | Entire | 5 | Not Listed |
| Puffin, Tufted | Fratercula cirrhata | Entire | 1 | Not Listed |
| Puffleg, black-breasted | Eriocnemis nigrivestis | Entire | Foreign | E |
| Puffleg, black-breasted | Eriocnemis nigrivestris | Entire | NA | Not Listed |
| Puma, Costa Rican | Puma (=Felis) concolor costaricensis | Entire | Foreign | E |
| Puma (=cougar), eastern | Puma (=Felis) concolor couguar | Entire | 5 | E |
| Puma (=mountain lion) | Puma (=Felis) concolor (all subsp. except coryi) | U.S.A. (FL) | 5 | SAT |
| Puma, Wisconsin | Felis concolor schorgeri | Entire | 3 | Not Listed |
| Puma, Yuma | Felis concolor browni | Entire | 2 | Not Listed |
| Pupfish, Ash Meadows Amargosa | Cyprinodon nevadensis mionectes | Entire | 8 | E |
| Pupfish, Comanche Springs | Cyprinodon elegans | Entire | 2 | E |
| Pupfish, Conchos | Cyprinodon eximius | Entire | 2 | Not Listed |
| Pupfish, desert | Cyprinodon macularius | Entire | 2 | E |
| Pupfish, Devils Hole | Cyprinodon diabolis | Entire | 8 | E |
| Pupfish, Leon Springs | Cyprinodon bovinus | Entire | 2 | E |
| Pupfish, Monkey Springs | Cyprinodon spp | Entire | NA | Not Listed |
| Pupfish, Owens | Cyprinodon radiosus | Entire | 8 | E |
| Pupfish, Palomas | Cyprinodon sp. | Entire | 2 | Not Listed |
| Pupfish, Pecos | Cyprinodon pecosensis | Entire | 2 | Not Listed |
| Pupfish, Shoshone | Cyprinodon nevadensis shoshone | Entire | 1 | Not Listed |
| Pupfish, Tecopa | Cyprinodon nevadensis calidae | Entire | 8 | D3A |
| Pupfish, Warm Springs | Cyprinodon nevadensis pectoralis | Entire | 8 | E |
| Pupfish, White Sands | Cyprinodon tularosa | Entire | 2 | Not Listed |
| purple cat's paw (=purple cat's paw pearlymussel) | Epioblasma obliquata obliquata | Entire Range; Except where listed as Experimental Populations | 3 | E |
| purple cat's paw (=purple cat's paw pearlymussel) | Epioblasma obliquata obliquata | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 3 | EXPN |
| Pus pilo | Capparis sandwichiana | 1 | Not Listed | |
| Pussypaws, Mariposa | Calyptridium pulchellum | 8 | T | |
| Pussytoes, meadow | Antennaria arcuata | 1 | Not Listed | |
| Pu`uka`a | Cyperus trachysanthos | 1 | E | |
| Pygmy-owl, cactus ferruginous | Glaucidium brasilianum cactorum | U.S.A. (AZ) | 2 | DO |
| Pygmypipes | Monotropsis odorata | 4 | Not Listed | |
| Pyralid moth, Daecke's | Crambus daeckeellus | Entire | 5 | Not Listed |
| Pyrg, bifid duct | Pyrgulopsis peculiaris | Entire | 6 | UR |
| Pyrg, Big Warm Spring | Pyrgulopsis papillata | Entire | 8 | Not Listed |
| Pyrg, Blue Point | Pyrgulopsis coloradensis | Entire | 8 | UR |
| Pyrg, Briley Creek | Pyrgulopsis sp. | Briley Creek | 4 | Not Listed |
| Pyrg, Butterfield | Pyrgulopsis lata | Entire | 8 | UR |
| Pyrg, Camp Valley | Pyrgulopsis montana | Entire | 8 | Not Listed |
| Pyrg, Corn Creek | Pyrgulopsis fausta | Entire | 8 | UR |
| Pyrg, Duckwater | Pyrgulopsis aloba | Entire | 8 | Not Listed |
| Pyrg, Duckwater Warm Springs | Pyrgulopsis villacampae | Entire | 8 | Not Listed |
| Pyrg, emigrant | Pyrgulopsis gracilis | Entire | 8 | Not Listed |
| Pyrg, flag | Pyrgulopsis breviloba | Entire | 8 | UR |
| Pyrg, flat-topped Steptoe | Pyrgulopsis planulata | Entire | 8 | UR |
| Pyrg, Flint River | Pyrgulopsis sp. | Flint R. | 4 | Not Listed |
| Pyrg, Hamlin Valley | Pyrgulopsis hamlinensis | Entire | 6 | UR |
| Pyrg, hardy | Pyrgulopsis marcida | Entire | 8 | UR |
| Pyrg, Hubbs | Pyrgulopsis hubbsi | Entire | 8 | UR |
| Pyrg, Lake Valley pryg | Pyrgulopsis sublata | Entire | 8 | UR |
| Pyrg, Landyes | Pyrgulopsis landyei | Entire | 8 | UR |
| Pyrg, Lockes | Pyrgulopsis lockensis | Entire | 8 | Not Listed |
| Pyrg, longitudinal | Pyrgulopsis anguina | Entire | 8 | UR |
| Pyrg, Moapa Valley | Pyrgulopsis carinifera | Entire | 8 | UR |
| Pyrg, Neritiform Steptoe Ranch | Pyrgulopsis neritella | Entire | 8 | UR |
| Pyrg, Northern Steptoe | Pyrgulopsis serrata | Entire | 8 | UR |
| Pyrg, Ozark | Pyrgulopsis ozarkensis | Entire | 4 | Not Listed |
| Pyrg, Southeast Nevada | Pyrgulopsis turbatrix | Entire | 8 | UR |
| Pyrg, Southern Duckwater | Pyrgulopsis anatina | Entire | 8 | Not Listed |
| Pyrg, Southern Steptoe | Pyrgulopsis sulcata | Entire | 8 | UR |
| Pyrg, Spring Creek | Pyrgulopsis sp. | Spring Creek | 4 | Not Listed |
| Pyrg, Spring Mountains | Pyrgulopsis deaconi | Entire | 8 | UR |
| Pyrg, Sterile Basin | Pyrgulopsis sterilis | Entire | 8 | UR |
| Pyrg, sub-globose Snake | Pyrgulopsis saxatilis | Entire | 6 | UR |
| Pyrg, sub-globose Steptoe Ranch | Pyrgulopsis orbiculata | Entire | 8 | UR |
| Pyrg, White River Valley | Pyrgulopsis sathos | Entire | 8 | UR |
| Pyrrocoma, Bear Valley | Pyrrocoma uniflora gossypina | 1 | Not Listed | |
| Python, Indian | Python molurus molurus | Entire | Foreign | E |
| Quail, Merriam's Montezuma | Cyrtonyx montezumae merriami | Entire | Foreign | E |
| Quail, mountain | Oreortyx pictus | Entire | 1 | Not Listed |
| Queen-of-the-forest | Filipendula occidentalis | 1 | Not Listed | |
| Quetzel, resplendent | Pharomachrus mocinno | Entire | Foreign | E |
| Quillwort, black spored | Isoetes melanospora | 4 | E | |
| Quillwort, Eaton's | Isoetes eatonii | 5 | Not Listed | |
| Quillwort, Louisiana | Isoetes louisianensis | 4 | E | |
| Quillwort, mat-forming | Isoetes tegetiformans | 4 | E | |
| Quillwort, Orcutt's | Isoetes orcuttii | 1 | Not Listed | |
| Quillwort, pitted | Isoetes foveolata | 5 | Not Listed | |
| Quillwort, pygmy | Isoetes bolanderi pygmaea | 1 | Not Listed | |
| Quillwort, rock | Isoetes lithophylla | 2 | Not Listed | |
| Quillwort, [unnamed] | Isoetes flaccida | 4 | Not Listed | |
| quillwort, Virginia | Isoetes virginica | 5 | Not Listed | |
| Quina | Antirhea portoricensis | 4 | Not Listed | |
| Quokka | Setonix brachyurus | Entire | Foreign | E |
| Rabbit, Appalachian cottontail | Sylvilagus obscurus | Entire | 4 | Not Listed |
| rabbit, brush | Sylvilagus bachmani | Entire | 1 | Not Listed |
| Rabbit, Davis Mountains cottontail | Sylvilagus floridanus robustus | Entire | 2 | Not Listed |
| Rabbit, Lower Keys marsh | Sylvilagus palustris hefneri | Entire | 4 | E |
| Rabbit, Micco cottontail | Sylvilagus floridanus ammophilus | Entire | 4 | Not Listed |
| Rabbit, New England cottontail | Sylvilagus transitionalis | Entire | 5 | C |
| Rabbit, pygmy | Brachylagus idahoensis | Columbia Basin DPS | 1 | E |
| Rabbit, pygmy | Brachylagus idahoensis | Entire | 1 | Not Listed |
| Rabbit, riparian brush | Sylvilagus bachmani riparius | Entire | 8 | E |
| Rabbit, Ryukyu | Pentalagus furnessi | Entire | Foreign | E |
| Rabbitsfoot | Quadrula cylindrica cylindrica | Entire | 4 | C |
| Rabbitsfoot, rough | Quadrula cylindrica strigillata | Entire | 5 | E |
| Rabbit, Smiths Island cottontail | Sylvilagus floridanus hitchensi | Entire | 5 | Not Listed |
| Rabbit, volcano | Romerolagus diazi | Entire | Foreign | E |
| rabdotus, Santa Rita | Naesiotus christenseni | Entire | 2 | Not Listed |
| Raccoon, Key Vaca | Procyon lotor auspicatus | Entire | 4 | Not Listed |
| Raccoon, Key West | Procyon lotor incautus | Entire | 4 | Not Listed |
| Racer, St. Croix | Alsophis sancticrucis | Entire | 4 | Not Listed |
| Ragwort, Ertter's | Senecio ertterae | 1 | Not Listed | |
| ragwort, Piedmont | Packera millefolia | 4 | Not Listed | |
| Ragwort, pussytoes | Senecio antennariifolius | 5 | Not Listed | |
| Railardella, scabrid | Raillardella scabrida | 1 | Not Listed | |
| Rail, Aukland Island | Rallus pectoralis muelleri | Entire | Foreign | E |
| Rail, barred-wing | Rallus poecilopterus | Entire | Foreign | UR |
| rail, Black | Laterallus jamaicensis | Entire | 3 | Not Listed |
| Rail, Bogota | Rallus semiplumbeus | Entire | Foreign | UR |
| rail, California black | laterallus jamaicensis ssp. coturniculus | Entire | 8 | Not Listed |
| Rail, California clapper | Rallus longirostris obsoletus | Entire | 8 | E |
| Rail, clapper | Rallus longirostris | Entire | 4 | Not Listed |
| Rail, Guam | Rallus owstoni | Entire, except Rota | 1 | E |
| Rail, Guam | Rallus owstoni | Rota | 1 | EXPN |
| Rail, Junin | Laterallus tuerosi | Entire | 9 | PE |
| Rail, king | Rallus elegans | Entire | 4 | Not Listed |
| Raillardella, Muir's | Raillardella muirii | 1 | Not Listed | |
| Raillardella, showy | Raillardella pringlei | 1 | Not Listed | |
| Railliardia, Sherff | Dubautia sherffiana | 1 | Not Listed | |
| Rail, light-footed clapper | Rallus longirostris levipes | U.S.A. only | 8 | E |
| Rail, Lord Howe wood | Gallirallus (=Tricholimnas) sylvestris | Entire | Foreign | E |
| Rail, mangrove clapper | Rallus longirostris insularum | Entire | 4 | Not Listed |
| Rail, Yuma clapper | Rallus longirostris yumanensis | U.S.A. only | 2 | E |
| Rams-horn, acorn | Planorbella multivolvis | Entire | 3 | Not Listed |
| Rams-horn Great Basin | Helisoma newberryi | Entire | 6 | Not Listed |
| Rams-horn, Greenfield | Taphius eucosmius eucosmius | Entire | 4 | Not Listed |
| Rams-horn, Knobby | Vorticifex sp | Entire | 8 | UR |
| Rams-horn Lamb | Planorbella oregonensis | Entire | 6 | Not Listed |
| Ramshorn, magnificent | Planorbella magnifica | Entire | 4 | C |
| Raspberry, Cuyamaca | Rubus glaucifolius ganderi | 1 | Not Listed | |
| Rat, false water | Xeromys myoides | Entire | Foreign | E |
| Rat-kangaroo, brush-tailed | Bettongia penicillata | Entire | Foreign | E |
| Rat-kangaroo, desert (=plain) | Caloprymnus campestris | Entire | Foreign | E |
| Rat-kangaroo, Gaimard's | Bettongia gaimardi | Entire | Foreign | E |
| Rat-kangaroo, Lesuer's | Bettongia lesueur | Entire | Foreign | E |
| Rat-kangaroo, Queensland | Bettongia tropica | Entire | Foreign | E |
| Rat, stick-nest | Leporillus conditor | Entire | Foreign | E |
| Rattlesnake, Arizona ridge-nosed | Crotalus willardi willardi | Entire | 2 | Not Listed |
| Rattlesnake, Aruba Island | Crotalus unicolor | Entire | Foreign | T |
| rattlesnake, Mojave green | crotalus scutulatus ssp. scutulatus | Entire | 2 | Not Listed |
| Rattlesnake, New Mexican ridge-nosed | Crotalus willardi obscurus | Entire | 2 | T |
| Rattlesnake, northern red diamond | Crotalus ruber ruber | Entire | 1 | Not Listed |
| Rattlesnake root, barbed | Prenanthes barbata | 4 | Not Listed | |
| Rattlesnake root, Boott's | Prenanthes boottii | 5 | Not Listed | |
| Rattlesnake root, mountain | Prenanthes roanensis | 4 | Not Listed | |
| rattlesnake, Speckled | crotalinae mitchellii | Entire | 6 | Not Listed |
| Rattlesnake, timber | Crotalus horridus | Entire | NA | Not Listed |
| Rattleweed, Cima | Astragalus cimae cimae | 1 | Not Listed | |
| Rattleweed, hairy | Baptisia arachnifera | 4 | E | |
| redhorse, Gray | moxostoma congestum | Entire | 2 | Not Listed |
| Redhorse, greater | Moxostoma valenciennesi | Entire | 6 | Not Listed |
| Redhorse, robust | Moxostoma robustum | Entire | 4 | Not Listed |
| Redhorse, Sicklefin | Moxostoma sp. | Entire | 4 | C |
| Reduviid, Smith's siacellan | Saicella smithi | Entire | 1 | Not Listed |
| Reedgrass, Cain's | Calamagrostis cainii | 4 | Not Listed | |
| Reedgrass, dense | Calamagrostis densa | 1 | Not Listed | |
| Reedgrass, Hillegrand's | Calamagrostis hillebrandii | 1 | C | |
| Reedgrass, leafy | Calamagrostis foliosa | 1 | Not Listed | |
| Reedgrass, Maui | Calamagrostis expansa | 1 | C | |
| Reedgrass, northern (=New England) | Calamagrostis inexpansa novae-angliae | 5 | Not Listed | |
| Reedgrass, Ofer Hollow | Calamagrostis porteri insperata | 3 | Not Listed | |
| Reedgrass, Porter's | Calamagrostis porteri | 4 | Not Listed | |
| Reedgrass, Thurber's | Calamagrostis crassiglumis | 1 | Not Listed | |
| Reedgrass, [unnamed] | Calamagrostis nubila | 5 | Not Listed | |
| Reedgrass, [unnamed] | Calamagrostis tweedyi | 1 | Not Listed | |
| Reedgrass, wood | Calamagrostis perplexa | 5 | Not Listed | |
| Reed-mustard, Barneby | Schoenocrambe barnebyi | 6 | E | |
| Reed-mustard, clay | Schoenocrambe argillacea | 6 | T | |
| Reed-mustard, shrubby | Schoenocrambe suffrutescens | 6 | E | |
| Rein orchid, Alaska | Platanthera unalascensis maritima | 1 | Not Listed | |
| Rein-orchid, southern | Platanthera flava | 4 | Not Listed | |
| Remya, Maui | Remya mauiensis | 1 | E | |
| Rhea, lesser (incl. Darwin's) | Rhea (=Pterocnemia) pennata | Entire | Foreign | E |
| Rhinoceros, black | Diceros bicornis | Entire | Foreign | E |
| Rhinoceros, great Indian | Rhinoceros unicornis | Entire | Foreign | E |
| Rhinoceros, Javan | Rhinoceros sondaicus | Entire | Foreign | E |
| Rhinoceros, northern white | Ceratotherium simum cottoni | Entire | Foreign | E |
| Rhinoceros, Sumatran | Dicerorhinus sumatrensis | Entire | Foreign | E |
| Rhododendron, Baker's | Rhododendron bakeri | 4 | Not Listed | |
| Rhododendron, Chapman | Rhododendron chapmanii | 4 | E | |
| Rhododendron, [unnamed] | Rhododendron austrinum | 4 | Not Listed | |
| Rice rat | Oryzomys palustris natator | Lower FL Keys (west of Seven Mile Bridge) | 4 | E |
| Rice rat, Coues' | Oryzomys couesi aquaticus | Entire | 2 | Not Listed |
| Rice rat, Pine Island | Oryzomys palustris planirostris | Entire | 4 | Not Listed |
| Rice rat, Sanibel Island | Oryzomys palustris sanibeli | Entire | 4 | Not Listed |
| Rice rat, silver | Oryzomys argentatus | Entire | NA | Not Listed |
| Ridge-cress, Barneby | Lepidium barnebyanum | 6 | E | |
| Riffle beetle, brownish dubiraphian | Dubiraphia brunnescens | Entire | 1 | Not Listed |
| Riffle beetle, Brown's microcylloepus | Microcylloepus browni | Entire | 6 | Not Listed |
| Riffle beetle, Brown's optioservus | Optioservus browni | Entire | 4 | Not Listed |
| Riffle beetle, Devil's Hole warm spring | Stenelmis calida calida | Entire | 1 | UR |
| Riffle beetle, Douglas stenelmis | Stenelmis douglasensis | Entire | 3 | Not Listed |
| Riffle beetle, dubiraphian | Dubiraphia sp. | Entire | 5 | Not Listed |
| Riffle beetle, Gammon's stenelmis | Stenelmis gammoni | Entire | 4 | Not Listed |
| Riffle beetle, Giuliani's dubiraphian | Dubiraphia giulianii | Entire | 1 | Not Listed |
| Riffle beetle, little | Dubiraphia parva | Entire | 4 | Not Listed |
| Riffle beetle, Marron's San Carlos | Huleechius marroni carolus | Entire | 2 | Not Listed |
| Riffle beetle, Moapa warm springs | Stenelmis calida moapa | Entire | 1 | UR |
| Riffle beetle, Parker's | Cylloepus parkeri | Entire | 2 | Not Listed |
| Riffle beetle, Pinnacles optioservus | Optioservus canus | Entire | 1 | Not Listed |
| Riffle beetle, robust dubiraphian | Dubiraphia robusta | Entire | 3 | Not Listed |
| Riffle beetle, Scott optioservus | Optioservus phaeus | Entire | 6 | Not Listed |
| Riffle beetle, Stephan's | Heterelmis stephani | Entire | 2 | C |
| Riffle beetle, [unnamed] | Microcylleopus fomicoideus | Entire | 1 | Not Listed |
| Riffle beetle, [unnamed] | Microcylleopus similis | Entire | 1 | Not Listed |
| Riffle beetle, Wawona | Atractelmis wawona | Entire | 1 | Not Listed |
| Riffleshell, angled | Epioblasma biemarginata | Entire | 4 | Not Listed |
| Riffleshell, northern | Epioblasma torulosa rangiana | Entire | 5 | E |
| Riffleshell, tan | Epioblasma florentina walkeri (=E. walkeri) | Entire | 4 | E |
| Riffleshell, Tennessee | Epioblasma propinqua | Entire | 4 | Not Listed |
| Ring pink (mussel) | Obovaria retusa | Entire | 4 | E |
| Ring pink (mussel) | Obovaria retusa | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| ringstem, Sticky | anulocaulis leiosolenus | 6 | Not Listed | |
| Ringtail | bassariscus astutus | Entire | 6 | Not Listed |
| Riversnail, Anthony's | Athearnia anthonyi | Entire Range; Except where listed as Experimental Populations | 4 | E |
| Riversnail, Anthony's | Athearnia anthonyi | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 4 | EXPN |
| Riversnail, Anthony's | Athearnia anthonyi | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Riversnail, spiny | Io fluvialis | Entire | 5 | UR |
| Roach, Gualala | Lavinia symmetricus parvipinnis | Entire | 1 | Not Listed |
| Roach, pit | Lavinia symmetricus mitrulus | Entire | 1 | Not Listed |
| Roach, Red Hills | Lavinia symmetricus ssp. | Entire | 1 | Not Listed |
| Roach, Tuna Cave | Aspiduchus cavernicola | Entire | 4 | Not Listed |
| Robberfly, Antioch cophuran | Cophura hurdi | Entire | 1 | Not Listed |
| Robberfly, Antioch efferian | Efferia antiochi | Entire | 1 | Not Listed |
| Robberfly, Hurd's metapogon | Metapogon hurdi | Entire | 1 | Not Listed |
| Robber fly, Oso Flaco | Ablautus schlingeri | Entire | 1 | Not Listed |
| Robin, Chatham Island | Petroica traversi | Entire | Foreign | E |
| Robin, dappled mountain | Arcanator orostruthus | Entire | Foreign | T |
| Robin, scarlet-breasted (flycatcher) | Petroica multicolor multicolor | Entire | Foreign | E |
| Robin, Southern Ryukyu | Erithacus komadori subrufa | Entire | Foreign | UR |
| Rock-aster, Alexander's | Eurybia avitus | 4 | Not Listed | |
| Rock-cress, Bodie Hills | Arabis bodiensis | 1 | Not Listed | |
| Rock-cress, Boundary Peak | Arabis pinzlae | 1 | Not Listed | |
| Rock-cress, Braun's | Arabis perstellata | 4 | E | |
| Rock-cress, Chico Creek | Arabis breweri austinae | 1 | Not Listed | |
| Rock-cress, coast | Arabis blepharophylla | 1 | Not Listed | |
| Rock-cress, Constance's | Arabis constancei | 1 | Not Listed | |
| Rock-cress, Daggett, | Arabis demissa languida | 6 | Not Listed | |
| Rock-cress, Daggett, | Arabis demissa russeola | 6 | Not Listed | |
| Rockcress, Fremont County | Boechera pusilla | 6 | C | |
| Rock-cress, fruit | Arabis fructicosa | 6 | Not Listed | |
| Rock-cress, Galena Creek | Arabis rigidissima demota | 1 | Not Listed | |
| Rockcress, Georgia | Arabis georgiana | 4 | C | |
| Rock-cress, Hoffmann's | Arabis hoffmannii | 8 | E | |
| Rock-cress, Johnston's | Arabis johnstonii | 1 | Not Listed | |
| Rock-cress, Koehler's | Arabis koehleri koehleri | 1 | Not Listed | |
| Rock-cress, McDonald's | Arabis macdonaldiana | 8 | E | |
| Rock-cress, modest | Arabis modesta | 1 | Not Listed | |
| Rock-cress, Oregon | Arabis oregana | 1 | Not Listed | |
| Rock-cress, Parish's | Arabis parishii | 1 | Not Listed | |
| Rock-cress, Park | Arabis vivariensis | 6 | Not Listed | |
| Rock-cress, Preston Peak | Arabis serpentinicola | 1 | Not Listed | |
| Rock-cress, pygmy | Arabis pygmaea | 1 | Not Listed | |
| Rock-cress, San Bernardino | Arabis breweri pecuniaria | 1 | Not Listed | |
| Rockcress, Santa Cruz Island | Sibara filifolia | 8 | E | |
| Rock-cress, Sapphire Mt. | Arabis fecunda | 6 | Not Listed | |
| rock cress, shale barren | Arabis serotina | 5 | E | |
| Rock-cress, Shockley's | Arabis shockleyi | 1 | Not Listed | |
| Rock-cress, sp. nov. ined. (Del Norte) | Arabis sp. | Del Norte | 1 | Not Listed |
| Rock-cress, sp. nov. ined. (Gray Knolls) | Arabis sp. | Gray Knolls | 6 | Not Listed |
| Rock-cress, Tiehm's | Arabis tiehmii | 1 | Not Listed | |
| Rock-cress, [unnamed] | Arabis crandallii | 6 | Not Listed | |
| Rock-cress, [unnamed] | Arabis dispar | 1 | Not Listed | |
| Rock-cress, [unnamed] | Arabis falcatoria | 6 | Not Listed | |
| Rock-cress, [unnamed] | Arabis falcifructa | 1 | Not Listed | |
| Rock-cress, [unnamed] | Arabis gracilipes | 2 | Not Listed | |
| Rock-cress, [unnamed] | Arabis gunnisoniana | 6 | Not Listed | |
| Rock-cress, [unnamed] | Arabis koehleri stipitata | 1 | Not Listed | |
| Rock-cress, [unnamed] | Arabis ophira | 1 | Not Listed | |
| Rock-cress, [unnamed] | Arabis petiolaris | 2 | Not Listed | |
| Rock-cress, [unnamed] | Arabis williamsii | 6 | Not Listed | |
| Rock-cress, Waldo | Arabis aculeolata | 1 | Not Listed | |
| Rock-daisy, Ajo | Perityle ajoensis | 2 | Not Listed | |
| Rock-daisy, Chiricahua | Perityle cochisensis | 2 | Not Listed | |
| Rock-daisy, Fish Creek | Perityle saxicola | 2 | Not Listed | |
| Rock-daisy, Glass Mountain | Perityle vitreomontana | 2 | Not Listed | |
| Rock-daisy, gray | Perityle cinerea | 2 | Not Listed | |
| Rock-daisy, Hueco | Perityle huecoensis | 2 | Not Listed | |
| Rock-daisy, nodding | Perityle cernua | 2 | Not Listed | |
| Rock-daisy, river | Perityle warnockii | 2 | Not Listed | |
| Rock-daisy, stairstep two-bristle | Perityle bisetosa scalaris | 2 | Not Listed | |
| Rock-daisy, two-bristle | Perityle bisetosa bisetosa | 2 | Not Listed | |
| Rock-daisy, [unnamed] | Perityle gilensis salensis | 2 | Not Listed | |
| Rock-daisy, [unnamed] | Perityle lindheimeri halimifolia | 2 | Not Listed | |
| Rock-daisy, [unnamed] | Perityle lindheimeri lindheimeri | 2 | Not Listed | |
| Rockfish, Canary | Sebastes pinniger | Puget Sound–Georgia Basin DPS—U.S.A. (WA) and British Columbia, including Puget Sound and Georgia Basin. | NMFS | T |
| Rockfish, Yelloweye | Sebastes ruberrimus | Puget Sound–Georgia Basin DPS—U.S.A. (WA) and British Columbia, including Puget Sound and Georgia Basin. | NMFS | T |
| Rockfowl, grey-necked | Picathartes oreas | Entire | Foreign | E |
| Rockfowl, white-necked | Picathartes gymnocephalus | Entire | Foreign | E |
| Rock-fringe, Siskiyou | Epilobium siskiyouense | 1 | Not Listed | |
| Rock lady | Holmgrenanthe petrophila | 1 | Not Listed | |
| Rockmat, chelan | Petrophytum cinerascens | 1 | Not Listed | |
| Rock-mint, felt leaf | Monardella hypoleuca lanata | 1 | Not Listed | |
| Rock-rose, Diablo | Helianthella castanea | 1 | Not Listed | |
| Rocksnail, agate | Leptoxis clipeata | Entire | 4 | Not Listed |
| Rocksnail, armored | Lithasia armigera | Entire | 4 | Not Listed |
| Rocksnail, bigmouth | Leptoxis occulata | Entire | 4 | Not Listed |
| Rocksnail, Coosa | Leptoxis showalteri | Entire | 4 | Not Listed |
| Rocksnail, helmet | Lithasia duttoniana | Entire | 4 | Not Listed |
| Rocksnail, interrupted | Leptoxis formani deprecated | Entire | 4 | Not Listed |
| Rocksnail, interrupted (=Georgia) | Leptoxis foremani | Entire | 4 | E |
| Rocksnail, knobby | Lithasia curta | Entire | 4 | Not Listed |
| Rocksnail, lyrate | Leptoxis lirata | Entire | 4 | Not Listed |
| Rocksnail, maiden | Leptoxis formosa | Entire | 4 | Not Listed |
| Rocksnail, muddy | Lithasia salebrosa | Entire | 4 | Not Listed |
| Rocksnail, oblong | Leptoxis compacta | Entire | 4 | Not Listed |
| Rocksnail, onyx | Leptoxis praerosa | Entire | 4 | Not Listed |
| Rocksnail, ornate | Lithasia geniculata | Entire | 4 | Not Listed |
| Rocksnail, painted | Leptoxis taeniata | Entire | 4 | T |
| Rocksnail, plicate | Leptoxis plicata | Entire | 4 | E |
| Rocksnail, rotund | Leptoxis ligata | Entire | 4 | Not Listed |
| Rocksnail, round | Leptoxis ampla | Entire | 4 | T |
| Rocksnail, rugose | Lithasia jayana | Entire | 4 | Not Listed |
| Rocksnail, smooth | Leptoxis virgata | Entire | 4 | Not Listed |
| Rocksnail, spotted | Leptoxis picta | Entire | 4 | Not Listed |
| Rocksnail, striped | Leptoxis vittata | Entire | 4 | Not Listed |
| Rocksnail, varicose | Lithasia verrucosa | Entire | 4 | Not Listed |
| Rocksnail, warty | Lithasia lima | Entire | 4 | Not Listed |
| Roller, long-tailed ground | Uratelornis chimaera | Entire | Foreign | E |
| Rose, Grand Canyon | Rosa stellata abyssa | 2 | Not Listed | |
| Rose-mallow, Neches River | Hibiscus dasycalyx | 2 | C | |
| Rosemary, Apalachicola | Conradina glabra | 4 | E | |
| Rosemary, Cumberland | Conradina verticillata | 4 | T | |
| Rosemary, Etonia | Conradina etonia | 4 | E | |
| Rosemary-mint | Poliomintha glabrescens | 2 | Not Listed | |
| Rosemary, short-leaved | Conradina brevifolia | 4 | E | |
| Rosemary, [unnamed] | Conradina grandiflora | 4 | Not Listed | |
| roseroot, Leedy's | Rhodiola integrifolia ssp. leedyi | 3 | T | |
| Rose, small-leaved | Rosa minutifolia | 1 | Not Listed | |
| Rosewood, limestone | Vauquelinia californica pauciflora | 2 | Not Listed | |
| Rosinweed, Fremont's | Calycadenia fremontii | 1 | Not Listed | |
| Rosinweed, Hoover's | Calycadenia hooveri | 1 | Not Listed | |
| Rosinweed, [unnamed] | Silphium brachiatum | 4 | Not Listed | |
| Rosinweed, [unnamed] | Silphium integrifolium gattingeri | 4 | Not Listed | |
| Rove beetle, black lordithon | Lordithon niger | Entire | 5 | Not Listed |
| rush, Ahart's dwarf | Juncus leiospermus var. ahartii | 1 | Not Listed | |
| Rush, bog, Barnstable | Juncus pervetus | 5 | Not Listed | |
| Rush, New Jersey | Juncus caesariensis | 5 | Not Listed | |
| Rushpea, broad-pod | Caesalpinia brachycarpa | 2 | Not Listed | |
| Rush-pea, slender | Hoffmannseggia tenella | 2 | E | |
| Rush, Red Bluff | Juncus leiospermus leiospermus | 1 | Not Listed | |
| Rush-rose, Amador | Helianthemum suffrutescens | 1 | Not Listed | |
| Rush-rose, bushy | Helianthemum dumosum | 5 | Not Listed | |
| Rush-rose, island | Helianthemum greenei | 8 | T | |
| Rush, [unnamed] | Juncus gymnocarpus | 4 | Not Listed | |
| Rush, [unnamed] | Juncus oronensis | 5 | Not Listed | |
| Sacahuista, sand | Nolina arenicola | 2 | Not Listed | |
| Sage, Aravaipa | Salvia amissa | 2 | Not Listed | |
| Sage, Arctic | Artemisia senjavinensis | 7 | Not Listed | |
| Sage, big red | Salvia penstemonoides | 2 | Not Listed | |
| Sage, Blodgett's | Salvia blodgettii | 4 | Not Listed | |
| Sage, Brandegee's | Salvia brandegei | 1 | Not Listed | |
| Sagebrush, Bolander's | Artemisia cana bolanderi | 1 | Not Listed | |
| Sagebrush, Coaltown | Artemisia argilosa | 6 | Not Listed | |
| Sagebrush, Porter | Artemisia porteri | 6 | Not Listed | |
| Sage, Death Valley | Salvia funerea | 1 | Not Listed | |
| Sage, desert | Salvia eremostachya | 1 | Not Listed | |
| Sage-grouse, greater | Centrocercus urophasianus | Bi-State | 8 | C |
| Sage-grouse, greater | Centrocercus urophasianus | Columbia basin DPS, WA | 1 | C |
| Sage-grouse, greater | Centrocercus urophasianus | entire | 6 | C |
| sage-grouse, Gunnison | Centrocercus minimus | entire | 6 | C |
| Sage, Orocopia | Salvia greatai | 1 | Not Listed | |
| Sage, Verde Valley | Salvia dorrii mearnsii | 2 | Not Listed | |
| sagewort, San Diego | artemisia palmeri | 6 | Not Listed | |
| Sagittaria, valley | Sagittaria sanfordii | 1 | Not Listed | |
| Saiga, Mongolian (antelope) | Saiga tatarica mongolica | Entire | Foreign | E |
| Saiya | Amoreuxia gonzalezii | 2 | Not Listed | |
| Saki, southern bearded | Chiropotes satanas satanas | Entire | Foreign | E |
| Saki, white-nosed | Chiropotes albinasus | Entire | Foreign | E |
| Salamander, Austin blind | Eurycea waterlooensis | Entire | 2 | C |
| Salamander, Barton Springs | Eurycea sosorum | Entire | 2 | E |
| salamander, Bay Springs | Plethodon ainsworthi | Entire | 4 | Not Listed |
| Salamander, Berry Cave | Gyrinophilus gulolineatus | Entire | 4 | C |
| salamander, Black-bellied slender | batrachoseps nigriventris | Entire | 6 | Not Listed |
| Salamander, Breckenridge Mountain slender | Batrachoseps sp. | Entire | 1 | Not Listed |
| Salamander, Buttercup Creek | Eurycea sp. | Buttercup Creek | 2 | Not Listed |
| Salamander, Caddo Mountain | Plethodon caddoensis | Entire | 4 | Not Listed |
| Salamander, California tiger | Ambystoma californiense | U.S.A. (CA - Santa Barbara County) | 8 | E |
| Salamander, California tiger | Ambystoma californiense | U.S.A. (CA - Sonoma County) | 8 | E |
| Salamander, California tiger | Ambystoma californiense | U.S.A. (Central CA DPS, not including Santa Barbara and Sonoma DPS) | 8 | T |
| Salamander, Cascade Caverns | Eurycea latitans | Entire | 2 | Not Listed |
| salamander, Cascade torrent | rhyacotriton cascadae | Entire | 6 | Not Listed |
| Salamander, Channel Islands slender | Batrachoseps pacificus pacificus | Entire | 1 | Not Listed |
| Salamander, Cheat Mountain | Plethodon nettingi | Entire | 5 | T |
| Salamander, Chinese giant | Andrias davidianus (=davidianus d.) | Entire | Foreign | E |
| Salamander, Coeur d'Alene | Plethodon idahoensis | Entire | 1 | Not Listed |
| salamander, Columbia torrent | rhyacotriton kezeri | Entire | 6 | Not Listed |
| Salamander, Comal blind | Eurycea tridentifera | Entire | 2 | UR |
| Salamander, Cow Knob | Plethodon punctatus | Entire | 5 | Not Listed |
| Salamander, dark-sided | Eurycea aquatica | Entire | 4 | Not Listed |
| Salamander, Del Norte | Plethodon elongatus | Entire | 1 | Not Listed |
| Salamander, desert slender | Batrachoseps aridus | Entire | 8 | E |
| salamander, Dunn's | plethodon dunni | Entire | 6 | Not Listed |
| Salamander, Fourche Mountain | Plethodon fourchensis | Entire | 4 | Not Listed |
| Salamander, frosted flatwoods | Ambystoma cingulatum | Entire | 4 | T |
| Salamander, Georgetown | Eurycea naufragia | Entire | 2 | C |
| Salamander, Georgia blind | Haideotriton wallacei | Entire | 4 | Not Listed |
| Salamander, green | Aneides aeneus | Entire | 4 | Not Listed |
| Salamander, Inyo Mountains slender | Batrachoseps campi | Entire | 1 | Not Listed |
| Salamander, Japanese giant | Andrias japonicus (=davidianus j.) | Entire | Foreign | E |
| Salamander, Jemez Mountains | Plethodon neomexicanus | Entire | 2 | C |
| Salamander, Jollyville Plateau | Eurycea tonkawae | Entire | 2 | C |
| Salamander, Junaluska | Eurycea junaluska | Entire | 4 | Not Listed |
| Salamander, Kern Canyon slender | Batrachoseps simatus | Entire | 1 | Not Listed |
| Salamander, Larch Mountain | Plethodon larselli | Entire | 1 | UR |
| Salamander, limestone | Hydromantes brunus | Entire | 1 | Not Listed |
| Salamander, Louisiana Slimy | Plethodon kisatchie | Entire | 4 | Not Listed |
| Salamander, Mount Lyell | Hydromantes platycephalus | Entire | 1 | Not Listed |
| salamander, Northwestern | ambystoma gracile | Entire | 7 | Not Listed |
| Salamander, Oklahoma | Eurycea tynerensis | Entire | 2 | Not Listed |
| Salamander, Olympic torrent | Rhyacotriton olympicus | Entire | 1 | Not Listed |
| Salamander, Oregon slender | Batrachoseps wrighti | Entire | 1 | Not Listed |
| Salamander, Ouachita dusky | Desmognathus brimleyorum | Entire | 4 | Not Listed |
| Salamander, Owens Valley web-toes | Hydromantes sp. | Entire | 1 | Not Listed |
| salamander, Pacific giant | dicamptodon tenebrosus | Entire | 6 | Not Listed |
| Salamander, Peaks of Otter | Plethodon hubrichti | Entire | 5 | Not Listed |
| salamander, Pygmy | Desmognathus wrighti | Entire | 4 | Not Listed |
| Salamander, Red Hills | Phaeognathus hubrichti | Entire | 4 | T |
| Salamander, relictual slender | Batrachoseps relictus | Entire | 1 | Not Listed |
| salamander, Reticulated flatwoods | Ambystoma bishopi | Entire | 4 | E |
| Salamander, Rich Mountain | Plethodon ouachitae | Entire | 4 | Not Listed |
| Salamander, robust blind | Typhlomolge robusta | Entire | 2 | Not Listed |
| Salamander, Sacramento mountain | Aneides hardii | Entire | 2 | Not Listed |
| Salamander, Salado | Eurycea chisholmensis | Entire | 2 | C |
| Salamander, San Marcos | Eurycea nana | Entire | 2 | T |
| Salamander, Santa Cruz long-toed | Ambystoma macrodactylum croceum | Entire | 8 | E |
| Salamander, Scott Bar | Plethodon asupak | Entire | 1 | Not Listed |
| Salamander, seepage | Desmognathus aeneus | Entire | 4 | Not Listed |
| Salamander, Shasta | Hydromantes shastae | Entire | 1 | Not Listed |
| Salamander, Shenandoah | Plethodon shenandoah | Entire | 5 | E |
| Salamander, Siskiyou Mountains | Plethodon stormi | Entire | 8 | Not Listed |
| Salamander, Sonora tiger | Ambystoma tigrinum stebbinsi | Entire | 2 | E |
| Salamander, southern dusky | Desmognatus auriculatus | Entire | 4 | Not Listed |
| Salamander, southern torrent | Rhyacotriton variegatus | Entire | 1 | Not Listed |
| Salamander, Techachapi slender | Batrachoseps stebbinsi | Entire | 1 | Not Listed |
| Salamander, Tennessee cave | Gyrinophilus palleucus | Entire | 4 | Not Listed |
| Salamander, Texas | Eurycea neotenes | Entire | 2 | UR |
| Salamander, Texas blind | Typhlomolge rathbuni | Entire | 2 | E |
| Salamander, Valdina Farms | Eurycea troglodytes | Entire | 2 | Not Listed |
| salamander, Van Dyke's | plethodon vandykei | Entire | 6 | Not Listed |
| salamander, Western redback | plethodon vehiculum | Entire | 6 | Not Listed |
| Salamander, West Virginia spring | Gyrinophilus subterraneus | Entire | 5 | Not Listed |
| Salmon, Atlantic | Salmo salar | Kennebec River DPS | 5 | Not Listed |
| Salmon, Atlantic | Salmo salar | U.S.A. ME Gulf of Maine Atlantic Salmon Distinct Population Segment, which includes all naturally reproducing wild populations and those river-specific hatchery populations of Atlantic salmon having historical, river-specific characteristics found north of and including tributaries of the lower Kennebec River to, but not including, the mouth of the St. Croix River at the U.S.-Canda border. To date, the Services have determined that these populations are found in the Dennys, East Machias, Machias, Pleasant, Narraguagus, Sheepscot, and Ducktrap Rivers and in Cove Brook, Maine | 5 | Not Listed |
| Salmon, Atlantic | Salmo salar | U.S.A., ME, Gulf of Maine Distinct Population Segment. The GOM DPS includes all anadromous Atlantic salmon whose freshwater range occurs in the watersheds from the Androscoggin River northward along the Maine coast to the Dennys River, and wherever these fish occur in the estuarine and marine environment. The following impassable falls delimit the upstream extent of the freshwater range: Rumford Falls in the town of Rumford on the Androscoggin River; Snow Falls in the town of West Paris on the Little Androscoggin River; Grand Falls in Township 3 Range 4 BKP WKR, on the Dead River in the Kennebec Basin; the un-named falls (impounded by Indian Pond Dam) immediately above the Kennebec River Gorge in the town of Indian Stream Township on the Kennebec River; Big Niagara Falls on Nesowadnehunk Stream in Township 3 Range 10 WELS in the Penobscot Basin; Grand Pitch on Webster Brook in Trout Brook Township in the Penobscot Basin; and Grand Falls on the Passadumkeag River in Grand Falls Township in the Penobscot Basin. The marine range of the GOM DPS extends from the Gulf of Maine, throughout the Northwest Atlantic Ocean, to the coast of Greenland. Included are all associated conservation hatchery populations used to supplement these natural populations; currently, such conservation hatchery populations are maintained at Green Lake National Fish Hatchery (GLNFH) and Craig Brook National Fish Hatchery (CBNFH). Excluded are landlocked salmon and those salmon raised in commercial hatcheries for aquaculture. | 5 | E |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | Central Valley spring-run ESU—U.S.A. (CA), including all naturally spawned populations of spring-run Chinook salmon in the Sacramento River and its tributaries in California, including the Feather River, as well as the Feather River Hatchery springrun Chinook program | NMFS | T |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | Lower Columbia River ESU—U.S.A. (OR, WA), including all naturally spawned populations of Chinook salmon from the Columbia River and its tributaries from its mouth at the Pacific Ocean upstream to a transitional point between Washington and Oregon east of the Hood River and the White Salmon River, and includes the Willamette River to Willamette Falls, Oregon, exclusive of spring-run Chinook salmon in the Clackamas River, as well as 17 artificial propagation programs: See 223.102 | NMFS | T |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | Puget Sound ESU—U.S.A. (WA), including all naturally spawned populations of Chinook salmon from rivers and streams flowing into Puget Sound including the Straits of Juan De Fuca from the Elwha River, eastward, including rivers and streams flowing into Hood Canal, South Sound, North Sound and the Strait of Georgia in Washington, as well as 26 artificial propagation programs: See 223.102 | NMFS | T |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | Sacramento River winter-run ESU—U.S.A. (CA), including all naturally spawned populations of winter-run Chinook salmon in the Sacramento River and its tributaries in California, as well as two artificial propagation programs: See 224.101(a) | NMFS | E |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | Snake River fall-run ESU—U.S.A. (ID, OR, WA), including all naturally spawned populations of fallrun Chinook salmon in the mainstem Snake River below Hells Canyon Dam, and in the Tucannon River, Grande Ronde River, Imnaha River, Salmon River, and Clearwater River, as well as four artificial propagation programs: See 223.102. | NMFS | T |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | Snake River spring/summer-run ESU—U.S.A. (ID, OR, WA), including all naturally spawned populations of spring/summer-run Chinook salmon in the mainstem Snake River and the Tucannon River, Grande Ronde River, Imnaha River, and Salmon River subbasins, as well as 15 artificial propagation programs: See 223.102. | NMFS | T |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | Upper Columbia spring-run ESU— U.S.A. (WA), including all naturally spawned populations of Chinook salmon in all river reaches accessible to Chinook salmon in Columbia River tributaries upstream of the Rock Island Dam and downstream of Chief Joseph Dam in Washington (excluding the Okanogan River), the Columbia River from a straight line connecting the west end of the Clatsop jetty (south jetty, Oregon side) and the west end of the Peacock jetty (north jetty, Washington side) upstream to Chief Joseph Dam in Washington, as well as six artificial propagation programs: See 224.101(a). | NMFS | E |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | Upper Willamette River ESU—U.S.A. (OR), including all naturally spawned populations of spring-run Chinook salmon in the Clackamas River and in the Willamette River, and its tributaries, above Willamette Falls, Oregon, as well as seven artificial propagation programs: See 223.102. | NMFS | T |
| Salmon, chinook | Oncorhynchus (=Salmo) tshawytscha | U.S.A.(CA) from Redwood Creek south to Russian R., inclusive, all naturally spawned populations in mainstems and tributaries | NMFS | T |
| Salmon, chum | Oncorhynchus (=Salmo) keta | U.S.A. (OR, WA) all naturally spawned populations in the Columbia R. and its tributaries | NMFS | T |
| Salmon, chum | Oncorhynchus (=Salmo) keta | U.S.A. (WA) all naturally spawned summer-run populations in Hood Canal and its tributaries and Olympic Penninsula rivers between Hood Canal and Dungeness Bay | NMFS | T |
| Salmon, coho | Oncorhynchus (=Salmo) kisutch | Central California Coast ESU—U.S.A. (CA), including all naturally spawned populations of coho salmon from Punta Gorda in northern California south to and including the San Lorenzo River in central California, as well as populations in tributaries to San Francisco Bay, excluding the Sacramento–San Joaquin River system, as well as four artificial propagation programs: See 224.101(a). | NMFS | E |
| Salmon, coho | Oncorhynchus (=Salmo) kisutch | Lower Columbia River ESU— U.S.A. (OR, WA), including all naturally spawned populations of coho salmon in the Columbia River and its tributaries in Washington and Oregon, from the mouth of the Columbia up to and including the Big White Salmon and Hood Rivers, and includes the Willamette River to Willamette Falls, Oregon, as well as 25 artificial propagation programs: See 223.102 | NMFS | T |
| Salmon, coho | Oncorhynchus (=Salmo) kisutch | Oregon Coast ESU—U.S.A. (OR), all naturally spawned populations of coho salmon in Oregon coastal streams south of the Columbia River and north of Cape Blanco, including the Cow Creek (Oregon Department of Fish and Wildlife stock #37) coho hatchery program. | NMFS | T |
| Salmon, coho | Oncorhynchus (=Salmo) kisutch | Southern Oregon–Northern California Coast ESU—U.S.A. (CA,OR), including all naturally spawned populations of coho salmon in coastal streams between Cape Blanco, Oregon, and Punta Gorda, California, as well as three artificial propagation programs: See 223.102. | NMFS | T |
| Salmon, sockeye | Oncorhynchus (=Salmo) nerka | Lake Sammamish and Lake Washington | 1 | Not Listed |
| Salmon, sockeye | Oncorhynchus (=Salmo) nerka | U.S.A. (Snake River, ID stock wherever found.) | NMFS | E |
| Salmon, sockeye | Oncorhynchus (=Salmo) nerka | U.S.A. (WA) all naturally spawned population in Ozette Lake and its tributary streams | NMFS | T |
| saltbrush, Lesser | atriplex minuscula | 6 | Not Listed | |
| Saltbush, Bakersfield | Atriplex tularensis | 1 | Not Listed | |
| saltbush, Coulter's | Atriplex coulteri | 1 | Not Listed | |
| Saltbush, Griffith's | Atriplex griffithsii | 2 | Not Listed | |
| Saltbush, Kleberg's | Atriplex klebergorum | 2 | Not Listed | |
| Saltbush, Lost Hills | Atriplex vallicola | 1 | Not Listed | |
| saltbush, Sacramento | Atriplex persistens | 1 | Not Listed | |
| Saltbush, south coast | Atriplex pacifica | 1 | Not Listed | |
| saltscale, Davidson's | atriplex serenana var. davidsonii | 6 | Not Listed | |
| Sandalwood, Lanai (=`iliahi) | Santalum freycinetianum var. lanaiense | 1 | E | |
| Sand aster, Del Mar | Corethrogyne filaginifolia linifolia | 1 | Not Listed | |
| Sandfood | Pholisma sonorae | 1 | Not Listed | |
| Sand grass, [unnamed] | Calamovilfa arcuata | 4 | Not Listed | |
| Sand grass, [unnamed] | Calamovilfa brevipilis | 4 | Not Listed | |
| Sand grass, [unnamed] | Calamovilfa brevipilis calvipes | 5 | Not Listed | |
| Sand grass, [unnamed] | Calamovilfa curtissii | 4 | Not Listed | |
| Sandlace | Polygonella myriophylla | 4 | E | |
| Sandmat, pineland | Chamaesyce deltoidea pinetorum | 4 | C | |
| Sandpaperplant, Death Valley | Petalonyx thurberi gilmanii | 1 | Not Listed | |
| sandshell, Southern | Hamiota (=Lampsilis) australis | Entire | 4 | PE |
| Sand-verbena, large-fruited | Abronia macrocarpa | 2 | E | |
| Sand-verbena, pink | Abronia umbellata breviflora | 1 | Not Listed | |
| Sand-verbena, Ramshaw Meadows | Abronia alpina | 8 | C | |
| Sand-verbena, rose-purple | Abronia umbellata acutalata | 1 | Not Listed | |
| Sand-verbena, [unnamed] | Abronia ammphila | 6 | Not Listed | |
| Sand-verbena, [unnamed] | Abronia bigelovii | 2 | Not Listed | |
| Sand-verbena, [unnamed] | Abronia orbiculata | 1 | Not Listed | |
| Sandwort, Alabama | Arenaria alabamensis | 4 | Not Listed | |
| Sandwort, Bear Valley | Arenaria ursina | 8 | T | |
| Sandwort, Cumberland | Arenaria cumberlandensis | 4 | E | |
| Sandwort, Forest Camp | Arenaria macradenia kuschei | 1 | Not Listed | |
| Sandwort, Howell's | Arenaria howellii | 1 | Not Listed | |
| Sandwort, Livermore | Arenaria livermorensis | 2 | Not Listed | |
| Sandwort, Marsh | Arenaria paludicola | 8 | E | |
| Sandwort, peanut | Minuartia rosei | 1 | Not Listed | |
| Sandwort, The Lassics | Minuartia decumbens | 1 | Not Listed | |
| Sanicle, adobe | Sanicula maritima | 1 | Not Listed | |
| Sanicle, Hoffman's | Sanicula hoffmannii | 1 | Not Listed | |
| Sanicle, Peck's | Sanicula peckiana | 1 | Not Listed | |
| Sanicle, rock | Sanicula saxatilis | 1 | Not Listed | |
| Sanicle, Tracy's | Sanicula tracyi | 1 | Not Listed | |
| Sapsucker, Williamson's | Sphyrapicus thyroideus | Entire | 1 | Not Listed |
| sapsucker, Yellow-bellied | sphyrapicus varius | Entire | 4 | Not Listed |
| Savory, San Miguel | Calamintha chandleri | 1 | Not Listed | |
| savory, San Miguel | clinopodium chandleri | 6 | Not Listed | |
| Sawfish, smalltooth | Pristis pectinata | Entire | NMFS | E |
| Saxifrage, Aleutian | Saxifraga aleutica | 7 | Not Listed | |
| Saxifrage, Forbes | Saxifraga forbesii | 3 | Not Listed | |
| Saxifrage, Gray's | Saxifraga caroliniana | 5 | Not Listed | |
| Saxifrage, Saddle Mountain | Saxifraga hitchcockii | 1 | Not Listed | |
| Saxifrage, [unnamed] | Saxifraga careyana | 4 | Not Listed | |
| Saytr, Yontocket | Coenonympha tullia yontockett | Entire | 1 | Not Listed |
| Scalebroom, gypsum | Lepidospartum burgessii | 2 | Not Listed | |
| Scarab, Andrews' dune | Pseudocotalpa andrewsi | entire | 8 | Not Listed |
| Scarab, aphodius tortoise commensal | Aphodius troglodytes | Entire | 4 | Not Listed |
| Scarab, Archbold anomalan | Anomala eximia | Entire | 4 | Not Listed |
| Scarab, Big Dune aphodius | Aphodius sp. | Big Dune | 1 | Not Listed |
| Scarab, bumblebee | Lichnanthe ursina | Entire | 1 | Not Listed |
| Scarab, caracara commensal | Trox howelli | Entire | 4 | Not Listed |
| Scarab, Ciervo aegialian | Aegialia concinna | Entire | 1 | Not Listed |
| Scarab, copris tortoise commensal | Copris gopheri | Entire | 4 | Not Listed |
| Scarab, Crescent Dune aegialian | Aegialia crescenta | Entire | 8 | UR |
| Scarab, Crescent Dune aphodius | Aphodius sp. | Crescent Dune | 1 | Not Listed |
| Scarab, Crescent Dunes serican | Serica ammomensico | Crescent Dune | 8 | UR |
| Scarab, exiguous anomalan | Anomala exigua | Entire | 4 | Not Listed |
| Scarab, Ford's aphodius | Aphodius fordi | Entire | 4 | Not Listed |
| Scarab, Frost's spring serican | Serica frosti | Entire | 4 | Not Listed |
| Scarab, Giuliani's dune | Pseudocotalpa giulianii | Entire | 8 | UR |
| Scarab, Hardy's aegialian | Aegialia hardyi | Entire | 8 | Not Listed |
| Scarab, Kelso Dune glaresis | Glaresis arenata | Entire | 1 | Not Listed |
| Scarab, large aegialian | Aegialia magnifica | Entire | 8 | UR |
| Scarab, Miami roundhead | Cyclocephala miamiensis | Entire | 4 | Not Listed |
| Scarab, Ocala burrowing | Peltotrupes youngi | Entire | 4 | Not Listed |
| Scarab, Onthophagus tortoise commensal | Onthophagus polyphemi | Entire | 4 | Not Listed |
| Scarab, Sand Mountain aphodius | Aphodius sp. | Sand Mt. | 1 | Not Listed |
| Scarab, Sand Mountain serican | Serica psammobunus | Entire | 8 | Not Listed |
| Scarab, Scrub Island burrowing | Mycotrupes pedester | Entire | 4 | Not Listed |
| Scarab, scrub palmetto flower | Trigonopelastes floridana | Entire | 4 | Not Listed |
| Scarab, spiny Florida sandhill | Gronocarus multispinosus | Entire | 4 | Not Listed |
| Scarab, tantula serican | Serica tantula | Entire | 4 | Not Listed |
| Scarab, tibial | Anomala tibialis | Entire | 2 | Not Listed |
| Scarab, white sand bear | Lichnanthe albopilosa | Entire | 1 | Not Listed |
| Scarab, Wooly Gulf dune | Polylamina pubescens | Entire | 4 | Not Listed |
| Scaup, lesser | Aythya affinis | Entire | 4 | Not Listed |
| Schiedea, Diamond Head | Schiedea adamantis | 1 | E | |
| Sclerocactus, sp. nov. ined. | Sclerocactus sp. | 6 | Not Listed | |
| Scorpion, Monterey Dunes | Pauroctonus maritimus | Entire | 1 | Not Listed |
| Screwstem, Texas | Bartonia texana | 2 | Not Listed | |
| Scrub-bird, noisy | Atrichornis clamosus | Entire | Foreign | E |
| scrub-jay, Florida | Aphelocoma coerulescens | Entire | 4 | T |
| Sculpin Bear Lake | Cottus extensus | Entire | 6 | Not Listed |
| Sculpin, bluestone | Cottus sp. | Entire | 5 | Not Listed |
| Sculpin, grotto | Cottus sp. | Entire | 3 | C |
| Sculpin, Malheur mottled | Cottus bairdi ssp. | Entire | 1 | Not Listed |
| Sculpin, margined | Cottus marginatus | Entire | 1 | Not Listed |
| Sculpin, pygmy | Cottus paulus (=pygmaeus) | Entire | 4 | T |
| Sculpin, rough | Cottus asperrimus | Entire | 1 | Not Listed |
| Sculpin, shoshone | Cottus greenei | Entire | 1 | UR |
| Sculpin, slender | Cottus tenuis | Entire | 1 | Not Listed |
| Sculpin, Wood River | Cottus leiopomus | Entire | 1 | Not Listed |
| Scurfpea, bigleaf | Orbexilum macrophyllum | 4 | Not Listed | |
| Scurf-pea, Rydberg's | Pediomelum humile | 2 | Not Listed | |
| Scurf-pea, three-nerved | Pediomelum pentaphyllum | 2 | UR | |
| Scurf-pea, [unnamed] | Pediomelum castoreum | 1 | Not Listed | |
| Scurf-pea, [unnamed] | Pediomelum epipsilum | 6 | Not Listed | |
| Scurf-pea, [unnamed] | Psoralea macrophylla | 4 | Not Listed | |
| Seablite, California | Suaeda californica | 8 | E | |
| seablite, Woolly | suaeda taxifolia | 6 | Not Listed | |
| Seagrass, Johnson's | Halophila johnsonii | NMFS | T | |
| Sea-lavender, [unnamed] | Limonium carolinianum angustatum | 4 | Not Listed | |
| Seal, Caribbean monk | Monachus tropicalis | Entire | NMFS | D3A |
| Seal, Guadalupe fur | Arctocephalus townsendi | Entire | NMFS | T |
| Seal, Hawaiian monk | Monachus schauinslandi | Entire | NMFS | E |
| Sea-lion, Steller | Eumetopias jubatus | Entire, except the population segment west of 1440 W. Long | NMFS | T |
| Sea-lion, Steller | Eumetopias jubatus | Population segment west of 1440 W. Long | NMFS | E |
| Seal, Mediterranean monk | Monachus monachus | Entire | NMFS | E |
| Seal, Saimaa | Phoca hispida saimensis | Entire | NMFS | E |
| Seal, spotted | Phoca largha | Southern DPS—all breeding populations of spotted seals south of 43 degrees north latitude in the Pacific Ocean | NMFS | T |
| Sea-purslane, roughseed | Sesuvium trianthemoides | 2 | Not Listed | |
| Sea turtle, green | Chelonia mydas | Breeding colony populations in FL and on Pacific coast of Mexico | 4 | E |
| Sea turtle, green | Chelonia mydas | Wherever found except where listed as endangered | 4 | T |
| Sea turtle, hawksbill | Eretmochelys imbricata | Entire | 4 | E |
| Sea turtle, Kemp's ridley | Lepidochelys kempii | Entire | 2 | E |
| Sea turtle, leatherback | Dermochelys coriacea | Entire | 4 | E |
| Sea turtle, loggerhead | Caretta caretta | Entire | 4 | T |
| Sea turtle, loggerhead | Caretta caretta | North Pacific population | 4 | UR |
| Sea turtle, loggerhead | Caretta caretta | Western North Atlantic population | 4 | T |
| Sea turtle, olive ridley | Lepidochelys olivacea | Breeding colony populations on Pacific coast of Mexico | 4 | E |
| Sea turtle, olive ridley | Lepidochelys olivacea | Wherever found except where listed as endangered | 4 | T |
| Sebucan, [unnamed] | Cereus quadricostatus | 4 | Not Listed | |
| Sedge, Anderson | Carex jacobi-peteri | 7 | Not Listed | |
| Sedge, Aroostook | Carex elachycarpa | 5 | Not Listed | |
| Sedge, Barratt's | Carex barrattii | 5 | Not Listed | |
| Sedge, Biltmore | Carex biltmoreana | 4 | Not Listed | |
| Sedge, Chapman's | Carex chapmanii | 4 | Not Listed | |
| Sedge, flat dune | Cyperus onerosus | 2 | Not Listed | |
| sedge, Florida brown checkered summer | Polycentropus floridensis | Entire | 4 | Not Listed |
| Sedge, golden | Carex lutea | 4 | E | |
| Sedge, Indian Valley | Carex aboriginum | 1 | Not Listed | |
| Sedge, Josselyn's | Carex josselynii | 5 | Not Listed | |
| Sedge, Manhart's | Carex manhartii | 4 | Not Listed | |
| Sedge, Navajo | Carex specuicola | 2 | T | |
| Sedge, San Luis | Carex obispoensis | 1 | Not Listed | |
| Sedge, Sierra | Carex paucifructus | 1 | Not Listed | |
| Sedge, small-living, thick-nerved | Carex microptera crassinervia | 6 | Not Listed | |
| Sedge, Thompkins' | Carex tompkinsii | 1 | Not Listed | |
| Sedge, tissue | Carex hyalina | 2 | Not Listed | |
| Sedge, umbrella | Cyperus grayoides | 3 | Not Listed | |
| Sedge, [unnamed] | Carex arapahoensis | 6 | Not Listed | |
| Sedge, [unnamed] | Carex austrocaroliniana | 4 | Not Listed | |
| Sedge, [unnamed] | Carex baltzellii | 4 | Not Listed | |
| Sedge, [unnamed] | Carex bicknellii opaca | 4 | Not Listed | |
| Sedge, [unnamed] | Carex communis amplisquama | 4 | Not Listed | |
| Sedge, [unnamed] | Carex decomposita | 3 | Not Listed | |
| Sedge, [unnamed] | Carex fissa | 2 | Not Listed | |
| Sedge, [unnamed] | Carex formosa | 3 | Not Listed | |
| Sedge, [unnamed] | Carex haysii | 6 | Not Listed | |
| Sedge, [unnamed] | Carex impressinervia | 4 | Not Listed | |
| Sedge, [unnamed] | Carex interrupta | 1 | Not Listed | |
| Sedge, [unnamed] | Carex lenticularis dolia | 7 | Not Listed | |
| Sedge, [unnamed] | Carex misera | 4 | Not Listed | |
| Sedge, [unnamed] | Carex onusta | 2 | Not Listed | |
| Sedge, [unnamed] | Carex oronensis | 5 | Not Listed | |
| Sedge, [unnamed] | Carex parryana idahoa | 1 | Not Listed | |
| Sedge, [unnamed] | Carex purpurifera | 4 | Not Listed | |
| Sedge, [unnamed] | Carex roanensis | 4 | Not Listed | |
| Sedge, [unnamed] | Carex schweinitzii | 5 | Not Listed | |
| Sedge, [unnamed] | Carex scirpoidea curatorum | 2 | Not Listed | |
| Sedge, [unnamed] | Carex socialis | 4 | Not Listed | |
| Sedge, [unnamed] | Cyperus louisianensis | 4 | Not Listed | |
| Sedge, variable | Carex polymorpha | 5 | Not Listed | |
| Sedge, waterfall's | Carex latebracteata | 2 | Not Listed | |
| Sedge, white | Carex albida | 8 | E | |
| Sedge, Whitney | Carex whitneyi | 1 | Not Listed | |
| Seed bug, Bryan's oceanides | Oceanides bryani | Entire | 1 | Not Listed |
| Seed bug, French Frigate Shoal | Nysius frigatensis | Entire | 1 | Not Listed |
| Seed bug, Fullaway's | Nysius fullawayi | Entire | 1 | Not Listed |
| Seed bug, Kauai band-legged | Neseis alternatus | Entire | 1 | Not Listed |
| Seed bug, Mauna Loa metrargan | Metrarga obscura | Entire | 1 | Not Listed |
| Seed bug, Mt. Haleakala | Neseis haleakalae | Entire | 1 | Not Listed |
| Seed bug, Necker bunchgrass | Nysius suffusus | Entire | 1 | Not Listed |
| Seed bug, Necker goosefoot | Nysius neckerensis | Entire | 1 | Not Listed |
| Seed bug, Nihoa nysius | Nysius nihoae | Entire | 1 | Not Listed |
| Seed bug, Perkins' oceanides | Oceanides perkinsi | Entire | 1 | Not Listed |
| Seed bug, rough-headed oceanides | Oceanides rugosiceps | Entire | 1 | Not Listed |
| Seed bug, Villosan flightless | Nesocryptias villosa | Entire | 1 | Not Listed |
| Seedeater, Tumaco | Sporophila insulata | Entire | NA | Not Listed |
| Seepweed, hardtoe | Suaeda duripes | 2 | Not Listed | |
| Seledang | Bos gaurus | Entire | Foreign | E |
| Selenia, Jones' | Selenia jonesii | 2 | Not Listed | |
| Semaphore grass, northcoast | Pleuropogon hooverianus | 1 | Not Listed | |
| Semaphore grass, Oregon | Pleuropogon oregonus | 1 | Not Listed | |
| Senna, Ripley's | Senna ripleyana | 2 | Not Listed | |
| Serow | Naemorhedus (=Capricornis) sumatraensis | Entire | Foreign | E |
| Serval, Barbary | Leptailurus (=Felis) serval constantina | Entire | Foreign | E |
| Service-berry, [unnamed] | Amelanchier nantucketensis | 5 | Not Listed | |
| Shagreen, Magazine Mountain | Mesodon magazinensis | Entire | 4 | T |
| Shama, Cebu black (thrush) | Copsychus niger cebuensis | Entire | Foreign | E |
| Shapo | Ovis vignei vignei | Entire | Foreign | E |
| Shearwater, Heinroth's | Puffinus heinrothi | Entire | Foreign | T |
| Shearwater, Newell's Townsend's | Puffinus auricularis newelli | Entire | 1 | T |
| Sheep, bighorn | Ovis canadensis | Entire | 8 | Not Listed |
| Sheep, Peninsular bighorn | Ovis canadensis nelsoni | U.S.A. (CA) Peninsular Ranges | 8 | E |
| Sheep, Sierra Nevada bighorn | Ovis canadensis sierrae | U.S.A. (CA) Sierra Nevada | 8 | E |
| Shield bug, Koa | Coleotichus blackburniae | Entire | 1 | Not Listed |
| Shiner, Altamaha | Notropis xaenurus | Entire | 4 | Not Listed |
| Shiner, Arkansas River | Notropis girardi | Arkansas River Basin (AR, KS, NM, OK, TX) | 2 | T |
| Shiner, beautiful | Cyprinella formosa | Entire | 2 | T |
| Shiner, blackmouth | Notropis melanostomus | Entire | 4 | Not Listed |
| Shiner, blue | Cyprinella caerulea | Entire | 4 | T |
| Shiner, bluestripe | Cyprinella callitaenia | Entire | 4 | Not Listed |
| Shiner, broadstripe | Pteronotropis euryzonus | Entire | 4 | Not Listed |
| Shiner, burrhead | Notropis asperifrons | Entire | 4 | Not Listed |
| Shiner, Cahaba | Notropis cahabae | Entire | 4 | E |
| Shiner, Cape Fear | Notropis mekistocholas | Entire | 4 | E |
| Shiner, Chihuahua | Notropis chihuahua | Entire | 2 | Not Listed |
| Shiner, colorless | Notropis perpallidus | Entire | 2 | Not Listed |
| Shiner, highscale | Notropis hypsilepis | Entire | 4 | Not Listed |
| Shiner, Maravillas red | Cyprinella lutrensis blairi | Entire | 2 | Not Listed |
| Shiner, Nueces River | Cyprinella sp. | Entire | 2 | Not Listed |
| Shiner, Ocmulgee | Cyprinella callisema | Entire | 4 | Not Listed |
| Shiner, Ouachita Mountain | Lythrurus snelsoni | Entire | 2 | Not Listed |
| Shiner, Ozark | Notropis ozarcanus | Entire | 4 | Not Listed |
| Shiner, palezone | Notropis albizonatus | Entire | 4 | E |
| Shiner, Pecos bluntnose | Notropis simus pecosensis | Entire | 2 | T |
| Shiner, phantom | Notropis orca | Entire | 2 | Not Listed |
| Shiner, proserpine | Cyprinella proserpina | Entire | 2 | Not Listed |
| Shiner, Rio Grande | Notropis jemezanus | Entire | 2 | Not Listed |
| Shiner, Rio Grande bluntnose | Notropis simus simus | Entire | 2 | Not Listed |
| Shiner, roughhead | Notropis semperasper | Entire | 5 | Not Listed |
| Shiner, sharpnose | Notropis oxyrhynchus | Entire | 2 | C |
| Shiner, smalleye | Notropis buccula | Entire | 2 | C |
| Shiner, Topeka | Notropis topeka (=tristis) | Entire | 6 | E |
| Shoal sprite | Amphigyra alabamensis | Entire | 4 | Not Listed |
| Shootingstar, French's | Dodecatheon frenchii | 3 | Not Listed | |
| Shootingstar, Tundra | Dodecatheon austrofrigidum | 1 | Not Listed | |
| Shore fly, Wilbur Springs | Paracoenia calida | Entire | 1 | Not Listed |
| Shou | Cervus elaphus wallichi | Entire | Foreign | E |
| Shoulderband, Bridges' Coast Range | Helminthoglypta nickliniana bridgesi | Entire | 1 | Not Listed |
| Shoulderband, Kern | Helminthoglypta callistoderma | Entire | 1 | Not Listed |
| Shoulderband, Merced Canyon | Helminthoglypta allynsmithi | Entire | 1 | Not Listed |
| Shoulderband, Peninsula Coast Range | Helminthoglypta nickliniana awania | Entire | 1 | Not Listed |
| Shoulderband, Peninsular Range | Helminthoglypta traski coelata | Entire | 1 | Not Listed |
| Shoulderband, Pomo bronze | Helminthoglypta arrosa pomoensis | Entire | 1 | Not Listed |
| Shoulderband, redwood | Helminthoglypta sequoicola consors | Entire | 1 | Not Listed |
| Shoulderband, Victorville | Helminthoglypta mohaveena | Entire | 1 | Not Listed |
| Shoulderband, Williams' bronze | Helminthoglypta arrosa williamsi | Entire | 1 | Not Listed |
| Shrew, Aransas short-tailed | Blarina hylophaga plumbea | Entire | 2 | Not Listed |
| Shrew, Arizona | Sorex arizonae | Entire | 2 | Not Listed |
| Shrew, Arizona water | Sorex palustris navigator | Entire | 2 | Not Listed |
| Shrew, Ashland | Sorex trigonirostris | Entire | 1 | Not Listed |
| Shrew, Buena Vista Lake ornate | Sorex ornatus relictus | Entire | 8 | E |
| Shrew, Destruction Island | Sorex trowbridgii destructioni | Entire | 1 | Not Listed |
| Shrew, Dismal Swamp short-tailed | Blarina brevicauda telmalestes | Entire | 4 | Not Listed |
| Shrew, Dismal Swamp southeastern | Sorex longirostris fisheri | Entire | 5 | DP |
| Shrew, Glacier Bay water | Sorex alaskanus | Entire | 7 | Not Listed |
| Shrew, Homossassa | Sorex longirostris eionis | Entire | 4 | Not Listed |
| Shrew, long-tailed | Sorex dispar | Entire | 5 | Not Listed |
| Shrew, Martha's Vineyard short-tailed | Blarina brevicauda aloga | Entire | 5 | Not Listed |
| Shrew, Monterey ornate | Sorex ornatus salarius | Entire | 1 | Not Listed |
| Shrew, Mt. Lyell | Sorex lyelli | Entire | 1 | Not Listed |
| Shrew, Nantucket short-tailed | Blarina brevicauda compacta | Entire | 5 | Not Listed |
| Shrew, northeastern pygmy | Microsorex hoyi thompsoni | Entire | 5 | Not Listed |
| Shrew, Preble's | Sorex preblei | Entire | 6 | Not Listed |
| Shrew, Pribilof Islands | Sorex hydrodromus | Entire | 7 | Not Listed |
| Shrew, salt marsh ornate | Sorex ornatus salicornicus | Entire | 1 | Not Listed |
| Shrew, salt marsh vagrant | Sorex vagrans halicoetes | Entire | 1 | Not Listed |
| Shrew, San Bernardino dusky | Sorex monticolus parvidens | Entire | 1 | Not Listed |
| Shrew, Santa Catalina ornate | Sorex ornatus willetti | Entire | 1 | Not Listed |
| Shrew, Sherman's short-tailed | Blarina brevicauda shermani | Entire | 4 | Not Listed |
| Shrew, southern pygmy | Sorex hoyi winnemana | Entire | 5 | Not Listed |
| Shrew, southern water | Sorex palustris punctulatus | Entire | 5 | Not Listed |
| Shrew, Suisun ornate | Sorex ornatus sinuosus | Entire | 1 | Not Listed |
| Shrew, Tuckahoe masked | Sorex cinereus nigriculus | Entire | 5 | Not Listed |
| shrike, Island loggerhead | Lanius ludovicianus ssp. anthonyi | entire | 8 | Not Listed |
| Shrike, Loggerhead | Lanius ludovicianus | Entire | 1 | Not Listed |
| Shrike, migrant loggerhead | Lanius ludovicianus migrans | Entire | 3 | Not Listed |
| Shrike, San Clemente loggerhead | Lanius ludovicianus mearnsi | Entire | 8 | E |
| Shrimp, Alabama cave | Palaemonias alabamae | Entire | 4 | E |
| Shrimp, anchialine pool | Antecaridina lauensis | Entire | 1 | Not Listed |
| Shrimp, anchialine pool | Calliasmata pholidota | Entire | 1 | Not Listed |
| Shrimp, anchialine pool | Metabetaeus lohena | Entire | 1 | C |
| Shrimp, anchialine pool | Palaemonella burnsi | Entire | 1 | C |
| Shrimp, anchialine pool | Procaris hawaiana | Entire | 1 | C |
| Shrimp, anchialine pool | Vetericaris chaceorum | Entire | 1 | C |
| Shrimp, California freshwater | Syncaris pacifica | Entire | 8 | E |
| Shrimp, Florida fairy | Dexteria floridana | Entire | 4 | Not Listed |
| Shrimp, Kentucky cave | Palaemonias ganteri | Entire | 4 | E |
| shrimp, Midvalley fairy | branchinecta | Entire | 6 | NS |
| Shrimp, Midvalley Fairy | Branchinecta mesovallensis | Entire | 1 | Not Listed |
| Shrimp, Squirrel Chimney Cave | Palaemonetes cummingi | Entire | 4 | T |
| Shrimp, Texas cave | Palaemonetes antrorum | Entire | 2 | Not Listed |
| Shrimp, troglobitic groundwater | Typhlatya monae | Entire | 4 | Not Listed |
| Shrimp, [unnamed] | Halocaridina palahemo | Entire | 1 | Not Listed |
| Siamang | Symphalangus syndactylus | Entire | Foreign | E |
| Sidalcea, Butte County | Sidalcea robusta | 1 | Not Listed | |
| Sidalcea, Cuesta Pass | Sidalcea hickmanii anomala | 1 | Not Listed | |
| Sidalcea, Hickman's | Sidalcea hickmanii hickmanii | 1 | Not Listed | |
| Sideband, Button's Sierra | Monadenia mormonum buttoni | Entire | 1 | Not Listed |
| Sideband, Dalles | Monadenia fidelis minor | Entire | 1 | UR |
| Sideband, hirsute sierra | Monadenia mormonum hirsuta | Entire | 1 | Not Listed |
| Sideband, keeled | Monadenia circumcarinata | Entire | 1 | Not Listed |
| Sideband, Rocky coast Pacific | Monadenia fidelis pronotis | Entire | 1 | Not Listed |
| sideband, Shasta | Monadenia troglodytes troglodytes | Entire | 1 | UR |
| sideband, Siskiyou | Monadenia chaceana | Entire | 8 | Not Listed |
| sideband, Wintu | Monadenia troglodytes ssp. wintu | Entire | 8 | UR |
| Sideband, Yosemite mariposa | Monadenia hillebrandi yosemitensis | Entire | 1 | Not Listed |
| Sideswimmer, Yancey | Stygobromus carolinensis | Entire | 4 | Not Listed |
| sidewinder | crotalinae cerastes | Entire | 6 | Not Listed |
| Sifakas | Propithecus spp. | Entire | Foreign | E |
| Siltsnail, crystal | Cincinnatia helicogyra | Entire | 4 | Not Listed |
| Siltsnail, Enterprise | Cincinnatia monroensis | Entire | 4 | Not Listed |
| Siltsnail, Ichetucknee | Cincinnatia mica | Entire | 4 | Not Listed |
| Siltsnail, ponderous | Cincinnatia ponderosa | Entire | 4 | Not Listed |
| Siltsnail, pygmy | Cincinnatia parva | Entire | 4 | Not Listed |
| Siltsnail, Seminole | Cincinnatia vanhyningi | Entire | 4 | Not Listed |
| Siltsnail, Wekiwa | Cincinnatia wekiwae | Entire | 4 | Not Listed |
| Silverbells, [unnamed] | Styrax platanifolia stellata | 2 | Not Listed | |
| silverbush, Blodgett's | Argythamnia blodgettii | 4 | C | |
| Silverling | Paronychia argyrocoma albimontana | 5 | Not Listed | |
| Silverside, Waccamaw | Menidia extensa | Entire | 4 | T |
| Silverspot, blue | Speyeria nokomis caerulescens | Entire | 2 | Not Listed |
| Silverspot, Carole's | Speyeria zerene carolae | Entire | 1 | Not Listed |
| Silverspot, Carson Valley | Speyeria nokomis carsonensis | Entire | 8 | Not Listed |
| Silverspot, Great Basin | Speyeria nokomis nokomis | Entire | 6 | Not Listed |
| Silverspot, Grey's | Speyeria atlantis greyi | Entire | 1 | Not Listed |
| Silverspot, Tehachapi Mountain | Speyeria egleis tehachapina | Entire | 1 | Not Listed |
| Silverspot, Willamette | Speyeria callippe extincta | Entire | 1 | Not Listed |
| Silversword, eke | Argyroxiphium caliginis | 1 | Not Listed | |
| Silversword, Mauna Loa (=Ka'u) | Argyroxiphium kauense | 1 | E | |
| Siren, Gulf Hammock dwarf | Pseudobranchus striatus lustricolus | Entire | 4 | Not Listed |
| Siren, Rio Grande lesser | Siren intermedia texana | Entire | 2 | Not Listed |
| Sisi | Ostodes strigatus | Entire | 1 | C |
| Siskin, red | Carduelis cucullata | Entire | Foreign | E |
| Skeletonplant, Entrada | Lygodesmia entrada | 6 | Not Listed | |
| Skimmer, Apalachicola twilight | Neurocordulia clara | Entire | 4 | Not Listed |
| Skimmer, banded bog | Williamsonia lintneri | Entire | 5 | Not Listed |
| skimmer, Black | rynchops niger | Entire | 6 | Not Listed |
| Skimmer, Margarita River | Macromia margarita | Entire | 5 | Not Listed |
| Skimmer, Wabash belted | Macromia wabashensis | Entire | 3 | Not Listed |
| Skink, Arizona Gilbert's | Eumeces gilberti arizonensis | Entire | 2 | Not Listed |
| Skink, bluetail mole | Eumeces egregius lividus | Entire | 4 | T |
| Skink, Cedar Key mole | Eumeces egregius insularis | Entire | 4 | Not Listed |
| Skink, Coronado | Eumeces skiltonianus interparietalis | Entire | 1 | Not Listed |
| Skink, Florida Keys mole | Eumeces egregius egregius | Entire | 4 | Not Listed |
| Skink, Pandanus | Aulacoplax leptosoma | Entire | 1 | Not Listed |
| Skink, Round Island | Leiolopisma telfairi | Entire | Foreign | T |
| Skink, sand | Neoseps reynoldsi | Entire | 4 | T |
| skink, Western red-tailed | eumeces gilberti ssp. rubricaudatus | Entire | 2 | Not Listed |
| Skipper, alkali | Pseudocopaeodes eunus eunus | Entire | 8 | Not Listed |
| Skipper, Bay | Euphyes bayensis | Entire | 4 | UR |
| Skipper, Carson wandering | Pseudocopaeodes eunus obscurus | Entire | 8 | E |
| Skipper, Chermock's mulberry wing | Poanes massasiot chermocki | Entire | 5 | Not Listed |
| Skipper, Dakota | Hesperia dacotae | Entire | 3 | C |
| Skipper, denio sandhill | Polites sabuleti sinemaculata | Entire | 8 | UR |
| Skipper, dun | Euphyes vestris harbisoni | Entire | 1 | UR |
| Skipper, eastern beard grass | Atrytone arogos arogos | Entire | 5 | Not Listed |
| Skipper, grizzled | Pyrgus wyandot | Entire | 5 | Not Listed |
| Skipper, Laguna Mountains | Pyrgus ruralis lagunae | Entire | 8 | E |
| skipperling, Poweshiek | Oarisma poweshiek | Entire | 3 | C |
| Skipper, MacNeill sooty wing | Hesperopsis gracielae | Entire | 1 | Not Listed |
| Skipper, maculated manfreda | Stallingsia maculosus | Entire | 2 | Not Listed |
| Skipper, Mardon | Polites mardon | Entire | 1 | C |
| Skipper, Pawnee montane | Hesperia leonardus montana | Entire | 6 | T |
| Skipper, Railroad Valley | Hesperia uncas giulianii | Entire | 8 | Not Listed |
| Skipper, rare | Problema bulenta | Entire | 4 | Not Listed |
| Skipper, Sonoma arctic | Carterocephalus palaemon ssp. | Entire | 1 | Not Listed |
| Skipper, Spring Mountain comma | Hesperia comma ssp. | Entire | 1 | Not Listed |
| Skipper, wandering | Panoquina errans | Entire | 1 | Not Listed |
| Skipper, White Mountains | Hesperia mirimae ssp. | Entire | 1 | Not Listed |
| Skipper, White Mountains sandhill | Polites sabuleti albomontana | Entire | 1 | Not Listed |
| Skistodiaptomus, Carolina | Skistodiaptomus carolinensis | Entire | 4 | Not Listed |
| Skullcap, Florida | Scutellaria floridana | 4 | T | |
| Skullcap, heart-leaved, | Scutellaria ovata pseudoarguta | 5 | Not Listed | |
| Skullcap, large-flowered | Scutellaria montana | 4 | T | |
| Skullcap, Ravendale | Scutellaria holmgreniorum | 1 | Not Listed | |
| Skullcap, smooth-stem | Scutellaria laevis | 2 | Not Listed | |
| Skullcap, Thieret's | Scutellaria thieretii | 4 | Not Listed | |
| Skullcap, [unnamed] | Scutellaria ocmulgee | 4 | Not Listed | |
| Skullcap, [unnamed] | Scutellaria saxatilis | 3 | Not Listed | |
| Skunk, Big Thicket hog-nosed | Conepatus mesoleucus telmalestes | Entire | 2 | Not Listed |
| Skunk, Channel Islands spotted | Spilogale putorius amphiala | Entire | 1 | Not Listed |
| Skunk, Colorado hog-nosed | Conepatus mesoleucus figginsi | Entire | 6 | Not Listed |
| Skunk, Eastern spotted | Spilogale putorius interrupta | Entire | 6 | UR |
| Skunk, Gulf Coast hog-nosed | Conepatus leuconotus texensis | Entire | 2 | Not Listed |
| Sky-pilot, Mason's | Polemonium chartaceum | 1 | Not Listed | |
| Skyrocket, Pagosa | Ipomopsis polyantha | 6 | E | |
| Slabshell, Chipola | Elliptio chipolaensis | Entire | 4 | T |
| Slabshell, Neuse | Elliptio judithae | Entire | 4 | Not Listed |
| Slider, Big Bend | Pseudemys scripta gaigeae | Entire | 2 | Not Listed |
| Slitmouth, Rich Mt. | Stenotrema pilsbryi | Entire | 4 | Not Listed |
| Slitshell, excised | Gyrotoma excisa | Entire | 4 | Not Listed |
| Slitshell, pagoda | Gyrotoma pagoda | Entire | 4 | Not Listed |
| Slitshell, pyramid | Gyrotoma pyramidata | Entire | 4 | Not Listed |
| Slitshell, ribbed | Gyrotoma pumila | Entire | 4 | Not Listed |
| Slitshell, round | Gyrotoma walkeri | Entire | 4 | Not Listed |
| Slitshell, striate | Gyrotoma lewisi | Entire | 4 | Not Listed |
| Sloth, Brazilian three-toed | Bradypus torquatus | Entire | Foreign | E |
| Slug, Santa Barbara shelled | Binneya notabilis | Entire | 1 | Not Listed |
| Smallheaded fly, Mary Alice's | Eulonchus marialiciae | Entire | 4 | Not Listed |
| Smelowskia, Mt. Lassen | Smelowskia ovalis congesta | 1 | Not Listed | |
| Smelt, Columbia River | Thaleichthys pacificus | Entire | NMFS | Not Listed |
| Smelt, delta | Hypomesus transpacificus | Entire | 8 | T |
| Smelt, longfin | Spirinchus thaleichthys | Entire | 8 | UR |
| Smelt, longfin, San Francisco Bay delta population | Spirinchus thaleichthys | San Francisco Bay delta population | 8 | C |
| Smelt, pygmy | Osmerus spectrum | Entire | 5 | Not Listed |
| Snaggletooth, shortneck | Gastrocopta dalliana dalliana | Entire | 2 | Not Listed |
| Snail, Alifan Tree | Partula salifana | Entire | 1 | Not Listed |
| snail, Aquatic | valvata mergella | Entire | 8 | Not Listed |
| Snail, Archer's toothed land | Mesodon archeri | Entire | 4 | Not Listed |
| Snail, armored | Pyrgulopsis (=Marstonia) pachyta | Entire | 4 | E |
| Snail, Badwater | Assiminea infima | Entire | 1 | Not Listed |
| Snail, bicolored cactus | Xerarionta tryoni | Entire | 1 | Not Listed |
| Snail, big-tooth covert | Mesodon jonesianus | Entire | 4 | Not Listed |
| Snail, Bliss Rapids | Taylorconcha serpenticola | Entire | 1 | T |
| Snail, boulder | Leptoxis crassa | Entire | 4 | Not Listed |
| Snail, Briarton Pleistocene | Vertigo briarensis | Entire | 3 | Not Listed |
| Snail, Cape Mendocino | Helminthoglypta arrosa mattolensis | Entire | 1 | Not Listed |
| Snail, cathedral | Micrarionta indioensis cathedralis | Entire | 1 | Not Listed |
| Snail, Chittenango ovate amber | Succinea chittenangoensis | Entire | 5 | T |
| Snail, dented Peninsula | Helminthoglypta arrosa miwoka | Entire | 1 | Not Listed |
| Snail, desert springsnail | Pyrgulopsis deserta | Entire | 6 | Not Listed |
| Snail, Diamond-Y pond | Physella bottomeri | Entire | 2 | Not Listed |
| Snail, Diamond Y Spring | Pseudotryonia (=Tryonia) adamantina | Entire | 2 | C |
| Snail, flat-spired three-toothed | Triodopsis platysayoides | Entire | 5 | T |
| Snail, Florida tree | Liguus fasciatus | Entire | 4 | Not Listed |
| Snail, fragile tree | Samoana fragilis | Entire | 1 | C |
| Snail, Gila Tryonia | Tryonia gilae | Entire | 2 | Not Listed |
| Snail, Guam tree | Partula radiolata | Entire | 1 | C |
| Snail, Hawai`i tree | Partulina confusa | Entire | 1 | Not Listed |
| Snail, Hawai`i tree | Partulina horneri | Entire | 1 | Not Listed |
| Snail, Hawai`i tree | Partulina physa | Entire | 1 | Not Listed |
| Snail, horseshoe | Micrarionta intercisa | Entire | 1 | Not Listed |
| Snail, Humped tree | Partula gibba | Entire | 1 | C |
| Snail, Indiana river | Goniobasis semicarinata indianensis | Entire | 3 | Not Listed |
| Snail, Iowa Pleistocene | Discus macclintocki | Entire | 3 | E |
| Snail, Jackson Lake | Helisoma jacksonense | Entire | 6 | Not Listed |
| Snail, Lanai tree | Partulina crassa | Entire | 1 | Not Listed |
| Snail, Lanai tree | Partulina semicarinata | Entire | 1 | C |
| Snail, Lanai tree | Partulina variabilis | Entire | 1 | C |
| Snail, Langford's tree | Partula langfordi | Entire | 1 | C |
| Snail, Longstreet Spring | Fluminicola sp. | Entire | 1 | Not Listed |
| Snail, Manus Island tree | Papustyla pulcherrima | Entire | Foreign | E |
| Snail, Maui tree | Partulina anceyana | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina carnicolor | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina crocea | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina dolei | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina fusoidea | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina germana | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina gouldii | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina grisea | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina induta | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina kaaeana | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina lemmoni | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina marmorata | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina mutabilis | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina natti | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina nivea | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina perdix | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina plumbea | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina porcellana | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina radiata | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina splendida | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina tapaniana | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina terebra | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina thaanumiana | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina ustulata | Entire | 1 | Not Listed |
| Snail, Maui tree | Partulina winniei | Entire | 1 | Not Listed |
| Snail, Mirey Ridge supercoil | Paravitrea clappi | Entire | 4 | Not Listed |
| Snail, Moloka`i tree | Partulina dwightii | Entire | 1 | Not Listed |
| Snail, Moloka`i tree | Partulina mighelsiana | Entire | 1 | Not Listed |
| Snail, Moloka`i tree | Partulina mucida | Entire | 1 | Not Listed |
| Snail, Moloka`i tree | Partulina proxima | Entire | 1 | Not Listed |
| Snail, Moloka`i tree | Partulina redfieldii | Entire | 1 | Not Listed |
| Snail, Moloka`i tree | Partulina rufa | Entire | 1 | Not Listed |
| Snail, Moloka`i tree | Partulina subpolita | Entire | 1 | Not Listed |
| Snail, Moloka`i tree | Partulina tessellata | Entire | 1 | Not Listed |
| Snail, Moloka`i tree | Partulina theodorei | Entire | 1 | Not Listed |
| Snail, Morro shoulderband (=Banded dune) | Helminthoglypta walkeriana | Entire | 8 | E |
| Snail, Mt. Matafao different | Diastole matafaoi | Entire | 1 | Not Listed |
| Snail, Newcomb's | Erinna newcombi | Entire | 1 | T |
| Snail, Newcomb's littorine | Algamorda newcombiana | Entire | 1 | Not Listed |
| Snail, New Mexico Ramshorn | Pecosorbis kansasensis | Entire | 2 | Not Listed |
| Snail, noonday | Mesodon clarki nantahala | Entire | 4 | T |
| Snail, Ofu tree | Samoana thurstoni | Entire | 1 | Not Listed |
| Snail, painted snake coiled forest | Anguispira picta | Entire | 4 | T |
| Snail, Pecos assiminea | Assiminea pecos | Entire | 2 | E |
| Snail, Phantom Cave | Cochliopa texana | Entire | 2 | C |
| Snail, Samoana tree | Samoana conica | Entire | 1 | Not Listed |
| Snail, San Clemente Island blunt-top | Sterkia clementina | Entire | 1 | Not Listed |
| Snail, sculpin | Stiobia nana | Entire | 4 | Not Listed |
| Snail, Short Samoan tree | Somoana abbreviata | Entire | 1 | Not Listed |
| Snail, small geniculate river | Lithasia pinguis | Entire | 4 | Not Listed |
| Snail, Snake River physa | Physa natricina | Entire | 1 | E |
| Snails, Oahu tree | Achatinella spp. | Entire | 1 | E |
| Snail, Spruce Creek | Melongena sprucecreekensis | Entire | 4 | Not Listed |
| Snail, Stock Island tree | Orthalicus reses (not incl. nesodryas) | Entire | 4 | T |
| Snail, tulotoma | Tulotoma magnifica | Entire | 4 | T |
| Snail, Tutuila tree | Eua zebrina | Entire | 1 | C |
| Snail, umbilicate river | Leptoxis subglubosa umbilicata | Entire | 4 | Not Listed |
| Snail, [unnamed] | Antrorbis breweri | Entire | 4 | Not Listed |
| Snail, [unnamed] | Catinella gelida | Entire | 3 | UR |
| Snail, [unnamed] | Diastole schmeltziana | Entire | 1 | Not Listed |
| Snail, [unnamed] | Laminella sanguinea | Entire | 1 | Not Listed |
| Snail, [unnamed] | Leptachatina lepida | Entire | 1 | Not Listed |
| Snail, [unnamed] | Mesodon clausus trossulus | Entire | 4 | Not Listed |
| Snail, [unnamed] | Neoplanorbis carinatus | Entire | 4 | Not Listed |
| Snail, [unnamed] | Neoplanorbis smithi | Entire | 4 | Not Listed |
| Snail, [unnamed] | Neoplanorbis tantillus | Entire | 4 | Not Listed |
| Snail, [unnamed] | Neoplanorbis umbilicatus | Entire | 4 | Not Listed |
| Snail, [unnamed] | Neritilia hawaiiensis | Entire | 1 | Not Listed |
| Snail, [unnamed] | Paravitrea aulacogyra | Entire | 4 | Not Listed |
| Snail, [unnamed] | Perdicella carinella | Entire | 1 | Not Listed |
| Snail, [unnamed] | Perdicella fulgurans | Entire | 1 | Not Listed |
| Snail, [unnamed] | Perdicella helena | Entire | 1 | Not Listed |
| Snail, [unnamed] | Perdicella kuhnsi | Entire | 1 | Not Listed |
| Snail, [unnamed] | Perdicella mauiensis | Entire | 1 | Not Listed |
| Snail, [unnamed] | Perdicella ornata | Entire | 1 | Not Listed |
| Snail, [unnamed] | Perdicella thwingii | Entire | 1 | Not Listed |
| Snail, [unnamed] | Perdicella zebra | Entire | 1 | Not Listed |
| Snail, [unnamed] | Perdicella zebrina | Entire | 1 | Not Listed |
| Snail, [unnamed] | Succinea guamensis | Entire | 1 | Not Listed |
| Snail, [unnamed] | Succinea piratarum | Entire | 1 | Not Listed |
| Snail, [unnamed] | Succinea quadrasi | Entire | 1 | Not Listed |
| Snail, [unnamed] | Trochomorpha apia | Entire | 1 | Not Listed |
| Snail, [unnamed] | Valvata virens | Entire | 1 | Not Listed |
| Snail, Utah valvata | Valvata utahensis | Entire | 1 | DP |
| Snail, Virginia fringed mountain | Polygyriscus virginianus | Entire | 5 | E |
| Snail, Virile Amargosa | Undescribed sp. | Entire | 1 | Not Listed |
| Snail, Waianae tree | Partulina dubia | Entire | 1 | Not Listed |
| Snail, wreathed cactus | Xerarionta redimita | Entire | 1 | Not Listed |
| Snake, Atlantic salt marsh | Nerodia clarkii taeniata | Entire | 4 | T |
| Snake, Black Hills redbelly | Storeria occipitomaculata pahasapae | Entire | 6 | Not Listed |
| Snake, black pine | Pituophis melanoleucus lodingi | Entire | 4 | C |
| Snake, Brazos water | Nerodia harteri harteri | Entire | 2 | UR |
| snake, California king | lampropeltis getula ssp. californiae | Entire | 8 | Not Listed |
| Snake, coast patch-nosed | Salvadora hexalepis virgultea | Entire | 1 | Not Listed |
| Snake, Concho water | Nerodia paucimaculata | Entire | 2 | DM |
| Snake, copperbelly water | Nerodia erythrogaster neglecta | Indiana north of 40 degrees north latitude, Michigan, Ohio | 3 | T |
| Snake, Culebra garden | Arrhyton exiguum exiguum | Entire | 4 | Not Listed |
| Snake, desert king | Lampropeltis getulus splendida | Entire | 2 | Not Listed |
| Snake, eastern indigo | Drymarchon corais couperi | Entire | 4 | T |
| Snake, Florida pine | Pituophis melanoleucus mugitus | Entire | 4 | Not Listed |
| Snake, giant garter | Thamnophis gigas | Entire | 8 | T |
| snake, Glossy | arizona elegans | Entire | 2 | Not Listed |
| Snake, gray-banded king | Lampropeltis mexicana alterna | Entire | 2 | Not Listed |
| Snake, Gulf salt marsh | Nerodia clarkii | Entire | 4 | Not Listed |
| snakehead, northern | Channa argus | Entire | Foreign | Not Listed |
| Snake, Key ringneck | Diadophis punctatus acricus | Entire | 4 | Not Listed |
| Snake, Kirtland's | Clonophis kirtlandii | Entire | 3 | Not Listed |
| Snake, Lake Erie water | Nerodia sipedon insularum | Lake Erie offshore islands and their adjacent waters (located more than 1 mile from mainland)_U.S.A. (OH), Canada (Ont.) | 3 | DM |
| Snake, Louisiana pine | Pituophis ruthveni | Entire | 4 | C |
| Snake, Maria Island | Liophus ornatus | Entire | Foreign | E |
| Snake, narrowhead garter | Thamnophis rufipunctatus | Entire | 2 | Not Listed |
| Snake, northern pine | Pituophis melanoleucus melanoleucus | Entire | 4 | Not Listed |
| snake, Northern water | Nerodia sipedon | Upper Tidal Potomac River population | 5 | Not Listed |
| Snake, queen | Regina septemvittata | Entire | 4 | Not Listed |
| Snake, Rimrock crowned | Tantilla oolitica | Entire | 4 | Not Listed |
| snake, Ringneck | diadophis punctatus | Entire | 2 | Not Listed |
| Snakeroot | Eryngium cuneifolium | 4 | E | |
| Snake, San Bernardino mountain king | Lampropeltis zonata parvirubra | Entire | 1 | Not Listed |
| Snake, San Bernardino ringneck | Diadophis punctatus modestus | Entire | 1 | Not Listed |
| Snake, San Diego Mountain king | Lampropeltis zonata pulchra | Entire | 1 | Not Listed |
| Snake, San Diego ringneck | Diadophis punctatus similis | Entire | 1 | Not Listed |
| Snake, San Francisco garter | Thamnophis sirtalis tetrataenia | Entire | 8 | E |
| Snake, Santa Cruz Island gopher | Pituophis melanoleucus pumilis | Entire | 1 | Not Listed |
| Snake, short-headed garter | Thamnophis brachystoma | Entire | 5 | Not Listed |
| Snake, short-tailed | Stilosoma extenuatum | Entire | 4 | Not Listed |
| snake, Sonoran lyre | trimorphodon biscutatus ssp. lambda | Entire | 6 | Not Listed |
| Snake, South coast garter | Thamnophis sirtalis ssp. | Entire | 1 | Not Listed |
| Snake, southern hognose | Heterodon simus | Entire | 4 | Not Listed |
| Snake, south Florida rainbow | Farancia erytrogramma seminola | Entire | 4 | Not Listed |
| Snaketail, Alleghany | Ophiogomphus incurvatus alleghaniensis | Entire | 4 | Not Listed |
| Snaketail, Edmund's | Ophiogomphus edmundo | Entire | 4 | Not Listed |
| Snaketail, extra-striped | Ophiogomphus anomalus | Entire | 3 | Not Listed |
| Snaketail, midget | Ophiogomphus howei | Entire | 4 | Not Listed |
| Snaketail, Ozark | Ophiogomphus westfalli | Entire | 4 | Not Listed |
| Snaketail, St. Croix | Ophiogomphus sp. | Entire | 3 | Not Listed |
| Snake, Texas garter | Thamnophis sirtalis annectens | Entire | 2 | Not Listed |
| Snake, Tucson shovel-nosed | Chionactis occipitalis klauberi | Entire | 2 | C |
| snake, Tucson shovel-nosed | chionactis occiptalis ssp. klauberi | Entire | 2 | Not Listed |
| Snake, two-striped garter | Thamnophis hammondii | Entire | 1 | Not Listed |
| snake, Valley Form ground | sonora semiannulata | Entire | 2 | Not Listed |
| snake, Western long-nosed | rhinocheilus lecontei ssp. lecontei | Entire | 6 | Not Listed |
| Snakewood, Comal | Colubrina stricta | 2 | Not Listed | |
| Snapdragon, dimorphic | Antirrhinum subcordatum | 1 | Not Listed | |
| Snapdragon, island | Galvezia speciosa | 1 | Not Listed | |
| Snapdragon, oval-leaved | Antirrhinum ovatum | 1 | Not Listed | |
| Sneezeweed, Virginia | Helenium virginicum | 5 | T | |
| Snowbells, Texas | Styrax texanus | 2 | E | |
| Snowbell, Young's | Styrax youngae | 2 | Not Listed | |
| Snowberry, McKittrick | Symphoricarpos guadalupensis | 2 | Not Listed | |
| Snowfly, Arapahoe | Capnia arapahoe | Entire | 6 | C |
| Soaproot, Red Hills | Chlorogalum grandiflorum | 1 | Not Listed | |
| Solenodon, Cuban | Solenodon cubanus | Entire | Foreign | E |
| Solenodon, Haitian | Solenodon paradoxus | Entire | Foreign | E |
| Sorrel, [unnamed] | Rumex krausei | 7 | Not Listed | |
| Spadefoot, western | Scaphiopus hammondii | Entire | 1 | Not Listed |
| Spanishneedle, giant | Palafoxia arida gigantea | 1 | Not Listed | |
| Sparrow, Alameda song | Melospiza melodia pusillula | Entire | 1 | Not Listed |
| Sparrow, Amak song | Melospiza melodia amaka | Entire | 7 | Not Listed |
| Sparrow, Bachman's | Aimophila aestivalis | Entire | 4 | Not Listed |
| Sparrow, Baird's | Ammodramus bairdii | Entire | 6 | Not Listed |
| Sparrow, Belding's savannah | Passerculus sandwichensis beldingi | Entire | 1 | Not Listed |
| Sparrow, Bell's sage | Amphispiza belli belli | Entire | 1 | Not Listed |
| Sparrow, Cape Sable seaside | Ammodramus maritimus mirabilis | Entire | 4 | E |
| Sparrow, dusky seaside | Ammodramus maritimus nigrescens | Entire | 4 | D3A |
| Sparrow, Florida grasshopper | Ammodramus savannarum floridanus | Entire | 4 | E |
| Sparrow, Grasshopper | Ammodramus savannarum | Entire | 1 | Not Listed |
| Sparrow, Grasshopper | Ammodramus savannarum ssp. perpallidus | Entire | 8 | Not Listed |
| Sparrowhawk, Anjouan Island | Accipiter francesii pusillus | Entire | Foreign | E |
| Sparrow, Henslow's | Ammodramus henslowii | Entire | 3 | Not Listed |
| Sparrow, large-billed savannah | Passerculus sandwichensis rostratus | Entire | 1 | Not Listed |
| Sparrow, Lincoln's | Melospiza lincolnii | Entire | 1 | Not Listed |
| Sparrow, Oregon vesper | Pooecetes gramineus ssp. affinis | Entire | 1 | Not Listed |
| Sparrow, San Clemente sage | Amphispiza belli clementeae | Entire | 8 | T |
| Sparrow, San Pablo song | Melospiza melodia samuelis | Entire | 1 | Not Listed |
| Sparrow, Santa Barbara song | Melospiza melodia graminea | Entire | 8 | D3A |
| Sparrow, Smyrna seaside | Ammodramus maritima pelonota | Entire | 4 | Not Listed |
| Sparrow, Southern California rufous-crowned | Aimophila ruficeps canescens | Entire | 1 | Not Listed |
| Sparrow, Suisun song | Melospiza melodia maxillaris | Entire | 1 | Not Listed |
| Sparrow, Texas Botteri's | Aimophila botterii texana | Entire | 2 | Not Listed |
| Sparrow, Texas Henslow's | Ammodramus henslowii houstonensis | Entire | 2 | Not Listed |
| Sparrow, Texas olive | Arremonops rufivirgatus rufivirgatus | Entire | 2 | Not Listed |
| Sparrow, Wakulla seaside | Ammodramus maritima junicola | Entire | 4 | Not Listed |
| Sparrow, Yuma rufous-crowned | Aimophila ruficeps rupicola | Entire | 2 | Not Listed |
| Spearscale, valley | Atriplex joaquiniana | 1 | Not Listed | |
| Spectaclecase (mussel) | Cumberlandia monodonta | Entire | 3 | E |
| Spectacle-pod, beach | Dithyrea maritima | 1 | Not Listed | |
| Speedwell, Copeland's | Veronica copelandii | 1 | Not Listed | |
| Sphecid wasp, bidecoratus | Ectemnius bidecoratus | Entire | 1 | Not Listed |
| Sphecid wasp, brown cross ectemnius | Ectemnius fulvicrus | Entire | 1 | Not Listed |
| Sphecid wasp, Giffard's ectemnius | Ectemnius giffardi | Entire | 1 | Not Listed |
| Sphecid wasp, Haleakala ectemnius | Ectemnius haleakalae | Entire | 1 | Not Listed |
| Sphecid wasp, Hawaiian deinomimesan | Deinomimesa hawaiiensis | Entire | 1 | Not Listed |
| Sphecid wasp, puna deinomimesan | Deinomimesa punae | Entire | 1 | Not Listed |
| Sphecid wasp, redheaded | Eucerceris ruficeps | Entire | 1 | Not Listed |
| Sphecid wasp, redtail | Ectemnius rubrocaudatus | Entire | 1 | Not Listed |
| Sphecid wasp, short-foot ectemnius | Ectemnius curtipes | Entire | 1 | Not Listed |
| Sphinx moth, Blanchards' | Adhemarius blanchardorum | Entire | 2 | Not Listed |
| Sphinx moth, Weist's | Euproserpinus wiesti | Entire | 6 | Not Listed |
| Spider, Bandit Cave | Cicurina bandida | Entire | 2 | Not Listed |
| Spider, cavern sheet-web | Islandiana speophila | Entire | 5 | Not Listed |
| Spider, Cave Spring Cave | Nesticus jonesi | Entire | 4 | Not Listed |
| Spider, Crystal Caverns cave | Nesticus furtivus | Entire | 4 | Not Listed |
| Spider, Dolloff Cave | Meta dollof | Entire | 1 | UR |
| Spiderflower, slender | Cleome multicaulis | 6 | Not Listed | |
| Spiderflower, wild | Cleome spinosa ssp. | 1 | Not Listed | |
| Spider, Government Canyon Bat Cave | Neoleptoneta microps | Entire | 2 | E |
| Spider, Grassy Creek Cave | Nesticus dilutus | Entire | 4 | Not Listed |
| Spider, Hawaiian | Doryonychus raptor | Entire | NA | Not Listed |
| Spider, Kauai cave wolf or pe'e pe'e maka 'ole | Adelocosa anops | Entire | 1 | E |
| Spider, Key gnaphosid | Cesonia irvingi | Entire | 4 | Not Listed |
| Spiderlily, Godfrey's | Hymenocallis godfreyi | 4 | Not Listed | |
| Spider-lily, shoals | Hymenocallis coronaria | 4 | Not Listed | |
| Spider-lily, [unnamed] | Hymenocallis henryae | 4 | Not Listed | |
| Spiderling, Mathis | Boerhavia mathisiana | 2 | Not Listed | |
| Spider, Lost Nantahala Cave | Nesticus cooperi | Entire | 4 | Not Listed |
| Spider, Rosemary wolf | Lycosa ericeticola | Entire | 4 | Not Listed |
| Spider, Santa Cruz telemid | Telema sp. | Entire | 1 | Not Listed |
| Spider, spruce-fir moss | Microhexura montivaga | Entire | 4 | E |
| Spider, Tooth Cave | Leptoneta myopica | Entire | 2 | E |
| Spider, Torreya trap-door | Cyclocosmia torreya | Entire | 4 | Not Listed |
| Spider, Ubick's gnaphoid | Talanites ubicki | Entire | NA | Not Listed |
| Spider, [unnamed] | Cicurina cueva | Entire | 2 | UR |
| Spider, Valentine's cave | Nesticus valentinei | Entire | 4 | Not Listed |
| Spiderwort, Wright's | Tradescantia wrightii | 2 | Not Listed | |
| Spike, Cape Fear | Elliptio marsupiobesa | Entire | 4 | Not Listed |
| Spikedace | Meda fulgida | Entire | 2 | T |
| Spike, false | Quincuncina mitchelli | Entire | 2 | UR |
| spike-moss, Ashy | selaginella cinerascens | 6 | Not Listed | |
| Spike, purple, Texas | Hexalectris warnockii | 2 | Not Listed | |
| Spikerush, cylinder | Eleocharis cylindrica | 2 | Not Listed | |
| Spikerush, short-fruited | Eleocharis brachycarpa | 2 | Not Listed | |
| Spiketail, Say's | Cordulegaster sayi | Entire | 4 | Not Listed |
| Spike, Waccamaw | Elliptio waccamawensis | Entire | 4 | Not Listed |
| Spikeweed, pappose | Hemizonia parryi congdonii | 1 | Not Listed | |
| Spinedace, Big Spring | Lepidomeda mollispinis pratensis | Entire | 8 | T |
| Spinedace, Little Colorado | Lepidomeda vittata | Entire | 2 | T |
| Spinedace, Pahranagat | Lepidomeda altivelis | Entire | 1 | Not Listed |
| Spinedace, Virgin River | Lepidomeda mollispinis mollispinis | Entire | 6 | Not Listed |
| Spinedace, White River | Lepidomeda albivallis | Entire | 8 | E |
| Spineflower, Ben Lomond | Chorizanthe pungens var. hartwegiana | 8 | E | |
| Spineflower, Blakley's | Chorizanthe blakleyi | 1 | Not Listed | |
| Spineflower, Brewer's | Chorizanthe breweri | 1 | Not Listed | |
| Spineflower, Howell's | Chorizanthe howellii | 8 | E | |
| Spineflower, Indian Valley | Aristocapsa insignis | 1 | Not Listed | |
| Spineflower, Mojave | Chorizanthe spinosa | 1 | Not Listed | |
| Spineflower, Monterey | Chorizanthe pungens var. pungens | 8 | T | |
| Spineflower, one-awned | Chorizanthe rectispina | 1 | Not Listed | |
| Spineflower, Orcutt's | Chorizanthe orcuttiana | 8 | E | |
| Spineflower, Parry's | Chorizanthe parryi parryi | 1 | Not Listed | |
| spineflower, Prostrate | chorizanthe procumbens | 6 | Not Listed | |
| spineflower, Ramona | Chorizanthe leptotheca | 1 | Not Listed | |
| Spineflower, Robust (incl. Scotts Valley) | Chorizanthe robusta (incl. vars. robusta and hartwegii) | 8 | E | |
| Spineflower, San Benito | Chorizanthe biloba immemora | 1 | Not Listed | |
| Spineflower, San Fernando Valley | Chorizanthe parryi var. fernandina | 8 | C | |
| Spineflower, San Francisco Bay | Chorizanthe cuspidata cuspidata | 1 | Not Listed | |
| Spineflower, slender-horned | Dodecahema leptoceras | 8 | E | |
| Spineflower, Sonoma | Chorizanthe valida | 8 | E | |
| Spinymussel, Altamaha | Elliptio spinosa | Entire | 4 | E |
| Spinymussel, James | Pleurobema collina | Entire | 5 | E |
| Spinymussel, Tar River | Elliptio steinstansana | Entire | 4 | E |
| Spiraea, Virginia | Spiraea virginiana | 5 | T | |
| Spleenwort, Scott's | Asplenium ebenoides | 4 | Not Listed | |
| Spleenwort, [unnamed] | Asplenium andrewsii | 2 | Not Listed | |
| Spleenwort, [unnamed] | Asplenium heteroresiliens | 4 | Not Listed | |
| Spleenwort, [unnamed] | Asplenium kentuckiense | 4 | Not Listed | |
| Spleenwort, [unnamed] | Asplenium leucostegioides | 1 | Not Listed | |
| Spleenwort, [unnamed] | Asplenium plenum | 4 | Not Listed | |
| Splittail, Clear Lake | Pogonichthys ciscoides | Entire | 1 | Not Listed |
| Splittail, Sacramento | Pogonichthys macrolepidotus | Entire | 8 | Not Listed |
| Sponge, Carolina | Corvomeyenia carolinensis | 4 | Not Listed | |
| Sponge, Kissimmee | Ephydatia subtilis | 4 | Not Listed | |
| Sponge, muscular | Anheteromyia biceps | 3 | Not Listed | |
| Sponge, Oklawaha | Dosilia palmeri | 4 | Not Listed | |
| Sponge, Oneida | Spongilla heteroslerifa | 5 | Not Listed | |
| Sponge, Pennsylvania | Heteromeyenia longistylis | 5 | Not Listed | |
| Sponge, spongy | Spongilla sponginosa | 4 | Not Listed | |
| Spring beauty, Peirson's | Claytonia lanceolata peirsonii | 1 | Not Listed | |
| Spring-beauty, [unnamed] | Claytonia virginica hammondiae | 5 | Not Listed | |
| Springfish, Hiko White River | Crenichthys baileyi grandis | Entire | 8 | E |
| Springfish, Moapa White River | Crenichthys baileyi moapae | Entire | 1 | UR |
| Springfish, Moorman White River | Crenichthys baileyi thermophilus | Entire | 1 | Not Listed |
| Springfish, Preston White River | Crenichthys baileyi albivallis | Entire | 1 | UR |
| Springfish, Railroad Valley | Crenichthys nevadae | Entire | 8 | T |
| Springfish, White River | Crenichthys baileyi baileyi | Entire | 8 | E |
| Springsnail, Aardhals | Pyrgulopsis aardhali | Entire | 1 | Not Listed |
| Springsnail, Alamosa | Tryonia alamosae | Entire | 2 | E |
| Springsnail, brown | Pyrgulopsis solus | Entire | 2 | Not Listed |
| Springsnail, Bruneau Hot | Pyrgulopsis bruneauensis | Entire | 1 | E |
| Springsnail, Bylas | Pyrgulopsis arizonae | Entire | 2 | Not Listed |
| Springsnail, Chupadera | Pyrgulopsis chupaderae | Entire | 2 | PE |
| Springsnail, Columbia | Pyrgulopsis | Entire | 1 | Not Listed |
| Springsnail, Crystal | Pyrgulopsis crystalis | Entire | 8 | UR |
| Springsnail, Davis County | Fontelicella davisi | Entire | 2 | Not Listed |
| Springsnail, distal-gland | Pyrgulopsis nanus | Entire | 8 | UR |
| Springsnail, elongate-gland | Pyrgulopsis isolatus | Entire | 8 | UR |
| Springsnail, elongate mud meadows | Pyrgulopsis notidicola | Entire | 8 | C |
| Springsnail, Fairbanks | Pyrgulopsis fairbanksensis | Entire | 8 | UR |
| Springsnail, Fish Slough | Pyrgulopsis perturbata | Entire | 1 | Not Listed |
| Springsnail, fossil | Pyrgulopsis simplex | Entire | 2 | Not Listed |
| Springsnail, Gila | Pyrgulopsis gilae | Entire | 2 | Not Listed |
| Springsnail, Gonzales | Tryonia circumstriata(=stocktonensis) | Entire | 2 | C |
| Springsnail, Grand Wash | Pyrgulopsis bacchus | Entire | 2 | Not Listed |
| Springsnail, Harney Lake | Pyrgulopsis hendersoni | Entire | 1 | Not Listed |
| Springsnail, Huachuca | Pyrgulopsis thompsoni | Entire | 2 | C |
| Springsnail, Idaho | Pyrgulopsis idahoensis | Entire | 1 | DO |
| Springsnail, Jackson Lake | Pyrgulopsis robusta | Entire | 6 | Not Listed |
| Springsnail, Kingman | Pyrgulopsis conicus | Entire | 2 | Not Listed |
| Springsnail, Koster's | Juturnia kosteri | Entire | 2 | E |
| Springsnail, median-gland Nevada | Pyrgulopsis pisteri | Entire | 8 | UR |
| Springsnail, Montezuma Well | Pyrgulopsis montezumensis | Entire | 2 | Not Listed |
| Springsnail, New Mexico | Pyrgulopsis thermalis | Entire | 2 | Not Listed |
| Springsnail, Oasis Valley | Pyrgulopsis micrococcus | Entire | 1 | UR |
| Springsnail, Owens | Pyrgulopsis owensensis | Entire | 1 | Not Listed |
| Springsnail, Page | Pyrgulopsis morrisoni | Entire | 2 | C |
| Springsnail, Pecos | Fontelicella pecosensis | Entire | 2 | Not Listed |
| Springsnail, Presidio County | Fontelicella metcalfi | Entire | 2 | Not Listed |
| Springsnail, Roswell | Pyrgulopsis roswellensis | Entire | 2 | E |
| springsnail, San Bernardino | Pyrgulopsis bernardina | Entire | 2 | PE |
| Springsnail, Socorro | Pyrgulopsis neomexicana | Entire | 2 | E |
| Springsnail, Three Forks | Pyrgulopsis trivialis | Entire | 2 | PE |
| Springsnail (=Tryonia), Phantom | Tryonia cheatumi | Entire | 2 | C |
| Springsnail, Verde Rim | Pyrgulopsis glandulosus | Entire | 2 | Not Listed |
| Springsnail, Wongs | Pyrgulopsis wongi | Entire | 1 | Not Listed |
| Springtail, Gandy Creek cave | Pseudosinella certa | Entire | 5 | Not Listed |
| Springtail, shelled cave | Pseudosinella testa | Entire | 5 | Not Listed |
| spurge, Cliff | euphorbia misera | 8 | Not Listed | |
| Spurge, Darlington's | Euphorbia purpurea | 5 | Not Listed | |
| Spurge, deltoid | Chamaesyce deltoidea ssp. deltoidea | 4 | E | |
| Spurge, flat-seeded | Chamaesyce platysperma | 1 | Not Listed | |
| Spurge, Garber's | Chamaesyce garberi | 4 | T | |
| Spurge, Hoover's | Chamaesyce hooveri | 8 | T | |
| Spurge, Paria | Euphorbia nephradenia | 6 | Not Listed | |
| Spurge, perennial | Chamaesyce perennans | 2 | Not Listed | |
| Spurge, Porter's, | Chamaesyce porteriana scoparia | 4 | Not Listed | |
| Spurge, Porter's, Key | Chamaesyce porteriana keyensis | 4 | Not Listed | |
| Spurge, Rosy-pink | Euphorbia rosescens | 4 | Not Listed | |
| Spurge, swallow | Chamaesyce golondrina | 2 | Not Listed | |
| Spurge, telephus | Euphorbia telephioides | 4 | T | |
| Spurge, three-tongued | Chamaesyce chaetocalyx triligulata | 2 | Not Listed | |
| Spurge, wedge | Chamaesyce deltoidea serpyllum | 4 | C | |
| Squaw carpet | Ceanothus prostratus laxus | 1 | Not Listed | |
| Squirrel, Allen's 13-lined ground | Spermophilus tridecemlineatus alleni | Entire | 6 | Not Listed |
| Squirrel, Carolina northern flying | Glaucomys sabrinus coloratus | Entire | 4 | E |
| Squirrel, Chiricahua Nayarit | Sciurus nayaritensis chiricahuae | Entire | 2 | Not Listed |
| Squirrel, Delmarva Peninsula fox | Sciurus niger cinereus | Entire, except Sussex Co., DE | 5 | E |
| Squirrel, Delmarva Peninsula fox | Sciurus niger cinereus | U.S.A. (DE, Sussex Co.) | 5 | EXPN |
| Squirrel, mangrove fox (=Big Cypress fox) | Sciurus niger avicennia | Entire | 4 | Not Listed |
| Squirrel, Mohave ground | Xerospermophilus mohavensis | Entire | 8 | Not Listed |
| Squirrel, Mount Graham red | Tamiasciurus hudsonicus grahamensis | Entire | 2 | E |
| Squirrel, Nelson's antelope ground | Ammospermophilus nelsoni | Entire | 1 | Not Listed |
| Squirrel, northern Idaho ground | Spermophilus brunneus brunneus | Entire | 1 | T |
| Squirrel, Palm Springs round-tailed ground (=Coachella Valley) | Xerospermophilus tereticaudus chlorus | Entire | 8 | Not Listed |
| Squirrel, Prince of Wales flying | Glaucomys sabrinus griseifrons | Entire | 7 | Not Listed |
| Squirrel, San Bernardino northern flying | Glaucomys sabrinus californicus | Entire | 8 | UR |
| Squirrel, Santa Catalina Mountains | Sciurus arizonensis catalinae | Entire | 2 | Not Listed |
| Squirrel, Sherman's fox | Sciurus niger shermani | Entire | 4 | Not Listed |
| Squirrel, Southern Idaho ground | Spermophilus brunneus endemicus | Entire | 1 | C |
| Squirrel, Virginia northern flying | Glaucomys sabrinus fuscus | Entire | 5 | E |
| Squirrel, Washington ground | Urocitellus washingtoni | Entire | 1 | C |
| Squirrel, western grey | Sciurus griseus | Entire | 1 | Not Listed |
| Stag, Barbary | Cervus elaphus barbarus | Entire | Foreign | E |
| Stag beetle, Kauai flightless | Apterocyclus honoluluensis | Entire | 1 | Not Listed |
| Stag, Kashmir | Cervus elaphus hanglu | Entire | Foreign | E |
| Star-grass, [unnamed] | Hypoxis longii | 4 | Not Listed | |
| Star leaf, Arizona | Choisya arizonica | 2 | Not Listed | |
| Star leaf, Santa Cruz | Choisya mollis | 2 | Not Listed | |
| Starling, Micronesian | Aplonisopaca guami | Entire | NA | Not Listed |
| Starling, Ponape mountain | Aplonis pelzelni | Entire | Foreign | E |
| Starling, Rothschild's (myna) | Leucopsar rothschildi | Entire | Foreign | E |
| Star-tulip, long-haired | Calochortus longebarbatus longebarbatus | 1 | Not Listed | |
| Steelhead | Oncorhynchus (=Salmo) mykiss | All naturally spawned populations and their progeny in river basins from Redwood Creek in Humboldt County, CA to the Gualala River in Mendocino County, CA (inclusive) | NMFS | T |
| Steelhead | Oncorhynchus (=Salmo) mykiss | All naturally spawned populations (and their progeny) in rivers from the Santa Maria R., San Luis Obispo County, CA (inclusive) to Malibu Cr., Los Angeles County, CA (inclusive) | NMFS | E |
| Steelhead | Oncorhynchus (=Salmo) mykiss | All naturally spawned populations (and their progeny) in streams and tributaries to the Columbia R. between the Cowlitz and Wind Rivers, WA, inclusive, and the Willamette and Hood Rivers, OR, inclusive, excluding the Upper Willamette River Basin above Willamette Falls and excluding the Little and Big White Salmon Rivers in WA | NMFS | T |
| Steelhead | Oncorhynchus (=Salmo) mykiss | All naturally spawned populations (and their progeny) in streams from the Pajaro R. (inclusive) located in Santa Cruz County, CA, to (but not including) the Santa Maria R | NMFS | T |
| Steelhead | Oncorhynchus (=Salmo) mykiss | All naturally spawned populations (and their progeny) in streams from the Russian R. to Aptos Cr., Santa Cruz County, CA (inclusive), and the drainages of San Francisco and San Pablo Bays eastward to the Napa R. (inclusive), Napa County, CA, excluding the Sacramento-San Joaquin R. Basin of the Central Valley of CA | NMFS | T |
| Steelhead | Oncorhynchus (=Salmo) mykiss | All naturally spawned populations (and their progeny) in streams in the Snake R. Basin of southeast WA, northeast OR, and ID | NMFS | T |
| Steelhead | Oncorhynchus (=Salmo) mykiss | All naturally spawned populations (and their progeny) in the Sacramento and San Joaquin Rivers and their tributaries, excluding San Francisco and San Pablo Bays and their tributaries | NMFS | T |
| Steelhead | Oncorhynchus (=Salmo) mykiss | All naturally spawned populations (and their progeny) in the Upper Columbia R. Basin upstream from the Yakima R., WA, to the U.S./Canada border, and also including the Wells Hatchery stock | NMFS | T |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Klamath Mountains Province steelhead(Oncorhynchus mykiss).Includes all Naturally spawned populations of Steelhead (and their progeny) in coastal river basins ranging from the Elk River in Curry County, Oregon, to the Klamath River, inclusive, in Del Norte County, California | NMFS | UR |
| Steelhead | Oncorhynchus (=Salmo) mykiss | U.S.A. (OR) All naturally spawned winter-run populations in the Willamette R. and its tributaries from Willamette Falls to the Calapooia R., inclusive | NMFS | T |
| Steelhead | Oncorhynchus (=Salmo) mykiss | U.S.A. (OR, WA) All naturally spawned populations in streams above and excluding the Wind R. in Washington, and the Hood R. in Oregon, upstream to, and including, the Yakima R. Excluded are steelhead from the Snake R. Basin | NMFS | T |
| Stickleaf, hairy | Mentzelia hirsutissima stenophylla | 1 | Not Listed | |
| Stickleaf, Mesa Verde | Hackelia gracilenta | 6 | Not Listed | |
| Stickleaf, Packard's | Mentzelia packardiae | 1 | UR | |
| Stickleaf, Royal Gorge | Mentzelia densa | 6 | Not Listed | |
| Stickleaf, smooth | Mentzelia mollis | 1 | UR | |
| Stickleaf, [unnamed] | Mentzelia nitens leptocaulis | 2 | Not Listed | |
| Stickleback, Santa Ana threespine | Gasterosteus aculeatus santaannae | Entire | 1 | Not Listed |
| Stickleback, unarmored threespine | Gasterosteus aculeatus williamsoni | Entire | 8 | E |
| Stick-pea, two-flowered | Calliandra biflora | 2 | Not Listed | |
| Stickseed, Cronquist's | Hackelia cronquistii | 1 | Not Listed | |
| Stickseed, Davis' | Hackelia davisii | 1 | Not Listed | |
| Stickseed, Poison Canyon | Hackelia brevicula | 1 | Not Listed | |
| Stickseed, Sharsmth's | Hackelia sharsmithii | 1 | Not Listed | |
| Stickseed, showy | Hackelia venusta | 1 | E | |
| Stickseed, [unnamed] | Hackelia ibapensis | 6 | Not Listed | |
| Stickseed, [unnamed] | Hackelia ophiobia | 1 | Not Listed | |
| Stickyseed, Point Reyes | Blennosperma nanum robustum | 1 | Not Listed | |
| Stilt, black | Himantopus novaezelandiae | Entire | Foreign | E |
| Stilt, Hawaiian | Himantopus mexicanus knudseni | Entire | 1 | E |
| Stingingbush | Malpighia infestissima | 4 | Not Listed | |
| Stink bells | Fritillaria agrestis | 1 | Not Listed | |
| Stink bug, gray oechalia | Oechalia grisea | Entire | 1 | Not Listed |
| Stink bug, patruelis oechalia | Oechalia patruelis | Entire | 1 | Not Listed |
| Stirrupshell | Quadrula stapes | Entire | 4 | E |
| Stitchwort, water | Arenaria fontinalis | 4 | Not Listed | |
| St. John's Wort, Radford's | Hypericum sp. 1 | 4 | Not Listed | |
| Stolon, [unnamed] | Draba sphaerocarpa | 1 | Not Listed | |
| Stonecrop, Applegate | Sedum oblanceolatum | 1 | Not Listed | |
| Stonecrop, Bartram | Graptopetalum bartramii | 2 | UR | |
| Stonecrop, Canyon Creek | Sedum paradisum | 1 | Not Listed | |
| Stonecrop, Davidson's | Sedum niveum | 1 | Not Listed | |
| Stonecrop, Feather River | Sedum albomarginatum | 1 | Not Listed | |
| Stonecrop, Heckner's | Sedum laxum heckneri | 1 | Not Listed | |
| Stonecrop, Lake County | Parvisedum leiocarpum | 8 | E | |
| Stonecrop, Nevius' | Sedum nevii | 4 | Not Listed | |
| Stonecrop, pale yellow | Sedum laxum flavidum | 1 | Not Listed | |
| Stonecrop, Pine City | Sedum pinetorum | 1 | Not Listed | |
| Stonecrop, Red Mountain | Sedum eastwoodiae | 8 | C | |
| Stonecrop, Reid's | Sedum moranii | 1 | Not Listed | |
| Stonecrop, Robert's | Sedum robertsianum | 2 | Not Listed | |
| Stonecrop, star-fruited, small | Sedum radiatum depauperatum | 1 | Not Listed | |
| Stonecrop, Texas | Sedum texanum | 2 | Not Listed | |
| Stonecrop, [unnamed] | Sedum pusillum | 4 | Not Listed | |
| Stonecrop, [unnamed] | Sedum rosea roanensis | 4 | Not Listed | |
| Stonefly, Cheaha beloneurian | Beloneuria jamesae | Entire | 4 | Not Listed |
| Stonefly, Chukcho | Haploperla chukcho | Entire | 4 | Not Listed |
| Stonefly, Fender's soliperlan | Soliperla fenderi | Entire | 1 | Not Listed |
| Stonefly, Georgia beloneurian | Beloneuria georgiana | Entire | 4 | Not Listed |
| Stonefly, Hanson's appalachian | Hansonoperla appalachia | Entire | 5 | Not Listed |
| Stonefly, Lake Tahoe benthic | Capnia lacustra | Entire | 1 | Not Listed |
| Stonefly, Leon River winter | Taeniopteryx starki | Entire | 2 | Not Listed |
| Stonefly, meltwater lednian | Lednia tumana | Entire | 6 | C |
| Stonefly, Natchez | Alloperla natchez | Entire | 4 | Not Listed |
| Stonefly, Robert's alloperlan | Alloperla roberti | Entire | 3 | Not Listed |
| Stonefly, Schoolhouse Springs leuctran | Leuctra szczytkoi | Entire | 4 | Not Listed |
| Stonefly, Shirttail Creek | Megaleuctra sierra | Entire | 1 | Not Listed |
| Stonefly, Wahkeena Falls flightless | Zapada wahkeena | Entire | 1 | Not Listed |
| Stoneroller, Mexican | Campostoma ornatum | Entire | 2 | Not Listed |
| Stopper, Simpson | Myrcianthes fragrans simpsonii | 4 | Not Listed | |
| Stork, oriental white | Ciconia boyciana (=ciconia b.) | Entire | Foreign | E |
| Stork, wood | Mycteria americana | U.S.A. (AL, FL, GA, SC) | 4 | E |
| Storm-petrel, ashy | Oceanodroma homochroa | Entire | 1 | Not Listed |
| Storm-petrel, band-rumped | Oceanodroma castro | Hawaii DPS | 1 | C |
| Streptanthus, alpine | Streptanthus gracilis | 1 | Not Listed | |
| Streptanthus, Contact Mine | Streptanthus brachiatus brachiatus | 1 | Not Listed | |
| Stroganowia, Tiehm's | Stroganowia tiehmii | 1 | Not Listed | |
| Sturgeon, Alabama | Scaphirhynchus suttkusi | Entire | 4 | E |
| Sturgeon, Atlantic | Acipenser oxyrinchus oxyrinchus | Entire | NMFS | Not Listed |
| Sturgeon, Beluga | Huso huso | Entire | Foreign | T |
| Sturgeon, gulf | Acipenser oxyrinchus desotoi | Entire | 4 | T |
| Sturgeon, lake | Acipenser fulvescens | Entire | 3 | Not Listed |
| Sturgeon, North American green | Acipenser medirostris | U.S.A. (CA) Southern Distinct Population Segment | NMFS | T |
| Sturgeon, pallid | Scaphirhynchus albus | Entire | 6 | E |
| Sturgeon, shortnose | Acipenser brevirostrum | Entire | NMFS | E |
| Sturgeon, Shovelnose | Scaphirhynchus platorynchus | Entire | 6 | SAT |
| Sturgeon, white | Acipenser transmontanus | U.S.A. (ID, MT), Canada (B.C.), (Kootenai R. system) | 1 | E |
| Succineid, Iowa Pleistocene | Succinea sp. | IA | 3 | Not Listed |
| Succineid, Minnesota Pleistocene | Succinea sp. | MN | 3 | Not Listed |
| Sucker, blue | Cycleptus elongatus | Entire | 3 | Not Listed |
| Sucker, desert | Catostomus clarki ssp. | Desert | 1 | Not Listed |
| Sucker, flannelmouth | Catostomus latipinnis | Entire | 2 | Not Listed |
| Sucker, Goose Lake | Catostomus occidentalis lacusanserinus | Entire | 1 | Not Listed |
| Sucker, harelip | Lagochila lacera | Entire | 4 | Not Listed |
| Sucker, Jenny Creek | Catostomus rimiculus ssp. | Entire | 1 | Not Listed |
| Sucker, June | Chasmistes liorus | Entire | 6 | E |
| Sucker, Klamath largescale | Catostomus snyderi | Entire | 1 | Not Listed |
| sucker longnose | Catostomus catostomus | Entire | 5 | Not Listed |
| Sucker, Lost River | Deltistes luxatus | Entire | 8 | E |
| Sucker, Meadow Valley Wash desert | Catostomus clarki ssp. | Meadow Valley | 1 | UR |
| Sucker, Modoc | Catostomus microps | Entire | 8 | E |
| Sucker, razorback | Xyrauchen texanus | entire | 6 | E |
| Sucker, rustyside | Moxostoma hamiltoni | Entire | 5 | Not Listed |
| Sucker, Santa Ana | Catostomus santaanae | Los Angeles River basin, San Gabriel River basin, Santa Ana River basin | 8 | T |
| Sucker, shortnose | Chasmistes brevirostris | Entire | 8 | E |
| Sucker, Snake River | Chasmistes muriei | Entire | 6 | Not Listed |
| Sucker, Sonora | Catostomus insignis | Entire | 2 | Not Listed |
| Sucker, Wall Canyon | Catostomus sp. | Entire | 1 | UR |
| Sucker, Warner | Catostomus warnerensis | Entire | 1 | T |
| Sucker, Webug | Catostomus fecundus | Entire | 6 | Not Listed |
| Sucker, White River desert | Catostomus clarki intermedius | Entire | 1 | UR |
| sucker, Yaqui | catostomus bernardini | Entire | 2 | Not Listed |
| Sucker, Zuni bluehead | Catostomus discobolus yarrowi | Entire | 2 | C |
| Sugarspoon | Epioblasma arcaeformis | Entire | 4 | Not Listed |
| Sullivantia, [unnamed] | Sullivantia sullivantii | 4 | Not Listed | |
| Sumac, Kearney's | Rhus kearneyi | 2 | Not Listed | |
| Sumac, Michaux's | Rhus michauxii | 4 | E | |
| Sumac, [unnamed] | Rhus trilobata arenaria | 3 | Not Listed | |
| Summer-holly | Comarostaphylis diversifolia diversifolia | 1 | Not Listed | |
| Sunbird, Marungu | Nectarinia prigoginei | Entire | Foreign | E |
| Sunburst, Hartweg's golden | Pseudobahia bahiifolia | 8 | E | |
| Sunburst, San Joaquin adobe | Pseudobahia peirsonii | 8 | T | |
| Sunfish, bluebarred pygmy | Elassoma okatie | Entire | 4 | Not Listed |
| Sunfish, Carolina pygmy | Elassoma boehlkei | Entire | 4 | Not Listed |
| Sunfish, spring pygmy | Elassoma alabamae | Entire | 4 | UR |
| Sunflower, Algodones Dunes | Helianthus niveus tephrodes | 1 | Not Listed | |
| Sunflower, Dimmit | Helianthus praecox hirtus | 2 | Not Listed | |
| Sunflower, Eggert's | Helianthus eggertii | 4 | DM | |
| Sunflower, Gulf beach | Helianthus debilis vestitus | 4 | Not Listed | |
| Sunflower, Laguna Mountains | Hulsea californica | 1 | Not Listed | |
| Sunflower, Los Angeles | Helianthus nuttallii parishii | 1 | Not Listed | |
| Sunflower, Paria | Viguiera soliceps | 6 | Not Listed | |
| Sunflower, Pecos (=puzzle, =paradox) | Helianthus paradoxus | 2 | T | |
| Sunflower, San Mateo woolly | Eriophyllum latilobum | 8 | E | |
| Sunflower, Schweinitz's | Helianthus schweinitzii | 4 | E | |
| Sunflower, serpentine | Helianthus exilis | 1 | Not Listed | |
| Sunflower, whorled | Helianthus verticillatus | 4 | C | |
| Suni, Zanzibar | Neotragus moschatus moschatus | Entire | Foreign | E |
| Sunnybell, Texas | Schoenolirion wrightii | 2 | Not Listed | |
| Sunray, Ash Meadows | Enceliopsis nudicaulis var. corrugata | 8 | T | |
| Sunshine, Sonoma | Blennosperma bakeri | 8 | E | |
| Supercoil, fragile | Glyphyalinia clingmani | Entire | 4 | Not Listed |
| Supercoil, Roan | Paravitrea varidens | Entire | 4 | Not Listed |
| Supercoil, sculpted | Paravitrea ternaria | Entire | 4 | Not Listed |
| Supercoil, sidelong | Paravitrea ceres | Entire | 5 | Not Listed |
| swallow, Bank | riparia riparia | Entire | 7 | Not Listed |
| swallow, Tree | tachycineta bicolor | Entire | 7 | Not Listed |
| Swan, trumpeter | Cygnus buccinator | Entire | 6 | Not Listed |
| Swan, trumpeter | Cygnus buccinator | Greater Yellowstone (Tri-state) breeding pop (DPS) | 6 | UR |
| Swan, trumpeter | Cygnus buccinator | Rocky Mountain Population | 6 | Not Listed |
| Sweet-bay, Sierra | Myrica hartwegii | 1 | Not Listed | |
| Sweet-cicely, Livermore | Osmorhiza mexicana bipatriata | 2 | Not Listed | |
| Swift, Black | Cypseloides niger | Entire | 1 | Not Listed |
| Swiftlet, Mariana gray | Aerodramus vanikorensis bartschi | Entire | 1 | E |
| swift, Vaux's | chaetura vauxi | Entire | 6 | Not Listed |
| Swordfern, Dudley's | Polystichum dudleyi | 1 | Not Listed | |
| Swordfern, Kruckeberg's | Polystichum kruckebergii | 1 | Not Listed | |
| Synandra, [unnamed] | Synandra hispidula | 4 | Not Listed | |
| Tabanid fly, brown merycomyian | Merycomyia brunnea | Entire | 4 | Not Listed |
| Tabanid fly, Florida asaphomyian | Asaphomyia floridensis | Entire | 4 | Not Listed |
| Tabanid fly, Ross's apatalestes | Apatalestes rossi | Entire | 1 | Not Listed |
| Tabanid fly, Texas asaphomyian | Asaphomyia texanus | Entire | 2 | Not Listed |
| Tabanid fly, volutine stonemyian | Stonemyia volutina | Entire | 1 | Not Listed |
| Tadpole shrimp, vernal pool | Lepidurus packardi | Entire | 8 | E |
| Tahr, Arabian | Hemitragus jayakari | Entire | Foreign | E |
| taildropper, Blue-gray | prophysaon coeruleum | Entire | 6 | Not Listed |
| taildropper, Papillose | prophysaon dubium | Entire | 6 | Not Listed |
| Takahe | Porphyrio mantelli | Entire | Foreign | UR |
| Talussnail, Clark Peak | Sonorella christenseni | Entire | 2 | Not Listed |
| Talussnail, Dona Ana | Sonorella todseni | Entire | 2 | Not Listed |
| Talussnail, Franklin Mountain | Sonorella metcalfi | Entire | 2 | Not Listed |
| Talussnail, Ladybug Saddle | Sonorella sp. | Entire | 2 | Not Listed |
| Talussnail, mimic | Sonorella imitator | Entire | 2 | Not Listed |
| Talussnail, Pinaleno | Sonorella grahamensis | Entire | 2 | Not Listed |
| Talussnail, Rosemont | Sonorella rosemontensis | Entire | 2 | C |
| Talussnail, San Xavier | Sonorella eremita | Entire | 2 | Not Listed |
| Talussnail, Squaw Park | Sonorella allynsmithi | Entire | 2 | Not Listed |
| Talussnail, Wet Canyon | Sonorella macrophallus | Entire | 2 | Not Listed |
| Tamaraw | Bubalus mindorensis | Entire | Foreign | E |
| Tamarindillo, [unnamed] | Cassia exunguis | 4 | Not Listed | |
| Tamarin, golden-rumped | Leontopithecus spp. | Entire | Foreign | E |
| Tamarin, pied | Saguinus bicolor | Entire | Foreign | E |
| Tamarin, white-footed | Saguinus leucopus | Entire | Foreign | T |
| Tanager, black-backed | Tangara peruviana | Entire | Foreign | UR |
| Tanager, cherry-throated | Nemosia rourei | Entire | 9 | E |
| tanager, Summer | piranga rubra | Entire | 6 | Not Listed |
| Tango, Miyako (=Toyko bitterling) | Tanakia tanago | Entire | Foreign | E |
| Tansy, dune | Tanacetum camphoratum | 1 | Not Listed | |
| Tansy, [unnamed] | Sphaeromeria compacta | 1 | Not Listed | |
| Tansy, Zion | Sphaeromeria ruthiae | 6 | Not Listed | |
| Tapaculo, Brasilia | Scytalopus novacapitalis | Entire | Foreign | UR |
| Tapir, Asian | Tapirus indicus | Entire | Foreign | E |
| Tapir, Central American | Tapirus bairdii | Entire | Foreign | E |
| Tapir, mountain | Tapirus pinchaque | Entire | Foreign | E |
| Tapir, South American (=Brazilian) | Tapirus terrestris | Entire | Foreign | E |
| Taraxacum, California | Taraxacum californicum | 8 | E | |
| Tarplant, Gaviota | Deinandra increscens ssp. villosa | 8 | E | |
| Tarplant, Otay | Deinandra (=Hemizonia) conjugens | 8 | T | |
| Tarplant, Santa Cruz | Holocarpha macradenia | 8 | T | |
| Tarplant, smooth | Hemizonia pungens laevis | 1 | Not Listed | |
| Tarplant, southern | Hemizonia parryi australis | 1 | Not Listed | |
| Tarsier, Philippine | Tarsius syrichta | Entire | Foreign | T |
| Tartaruga | Podocnemis expansa | Entire | Foreign | E |
| Tarweed, Hall's | Hemizonia halliana | 1 | Not Listed | |
| Tarweed, Mojave | Hemizonia mohavensis | 1 | Not Listed | |
| Tarweed, Red Rock | Hemizonia arida | 1 | Not Listed | |
| Tarweed, Santa Susana | Hemizonia minthornii | 1 | Not Listed | |
| Tarweed, seaside | Hemizonia multicaulis multicaulis | 1 | Not Listed | |
| Tarweed, Tecate | Hemizonia floribunda | 1 | Not Listed | |
| Tarweed, Tiburon | Hemizonia multicaulis vernalis | 1 | Not Listed | |
| Tauschia, glaucous | Tauschia glauca | 1 | Not Listed | |
| Tauschia, Hoover's | Tauschia hooveri | 1 | Not Listed | |
| Tauschia, Howell's | Tauschia howellii | 1 | Not Listed | |
| Teal, Campbell Island flightless | Anas aucklandica nesiotis | Entire | Foreign | E |
| Temoleh, Ikan (minnow) | Probarbus jullieni | Entire | Foreign | E |
| Terciopelo | Abutilon commutatum | 4 | Not Listed | |
| Tern, black | Chlidonias niger | Entire | 6 | Not Listed |
| Tern, California least | Sterna antillarum browni | Entire | 8 | E |
| Tern, common | Sterna hirundo | Entire | 3 | Not Listed |
| Tern, elegant | Sterna elegans | Entire | 1 | Not Listed |
| Tern, least | Sterna antillarum | U.S.A. (AR, CO, IA, IL, IN, KS, KY, LA_Miss. R. and tribs. N of Baton Rouge, MS_Miss. R., MO, MT, ND, NE, NM, OK, SD, TN, TX_except within 50 miles of coast) | 4 | E |
| Tern, roseate | Sterna dougallii dougallii | U.S.A. (Atlantic Coast south to NC), Canada (Newf., N.S, Que.), Bermuda | 5 | E |
| Tern, roseate | Sterna dougallii dougallii | Western Hemisphere and adjacent oceans, incl. U.S.A. (FL, PR, VI), where not listed as endangered | 4 | T |
| Tern, Van Rossem's gull-billed | Sterna nilotica vanrossemi | Entire | 8 | Not Listed |
| Terrapin, Mississippi diamondback | Malaclemys terrapin pileata | Entire | 4 | Not Listed |
| Terrapin, northern diamondback | Malaclemys terrapin terrapin | Entire | 5 | Not Listed |
| Terrapin, river | Batagur baska | Entire | Foreign | E |
| Terrapin, Texas diamondback | Malaclemys terrapin littoralis | Entire | 2 | Not Listed |
| Tetracoccus, holly-leaved | Tetracoccus ilicifolius | 1 | Not Listed | |
| Tetracoccus, Parry's | Tetracoccus dioicus | 1 | Not Listed | |
| Tetraplasandra, Wai`anae | Tetraplasandra waianensis | 1 | Not Listed | |
| Thelypody, Fresno Creek | Thelypodium tenue | 2 | Not Listed | |
| Thelypody, Howell's spectacular | Thelypodium howellii spectabilis | 1 | T | |
| Thelypody, Jaeger's | Thelypodium repandum | 1 | Not Listed | |
| Thelypody, short-podded | Thelypodium brachycarpum | 1 | Not Listed | |
| Thelypody, [unnamed] | Thelypodium texanum | 2 | Not Listed | |
| Thistle | Cirsium brevifolium | 1 | Not Listed | |
| Thistle, Ashland | Cirsium ciliolatum | 1 | Not Listed | |
| Thistle, Chorro Creek bog | Cirsium fontinale var. obispoense | 8 | E | |
| Thistle, Clokey's | Cirsium clokeyi | 1 | Not Listed | |
| Thistle, compact cobweb | Cirsium occidentale compactum | 1 | Not Listed | |
| Thistle, fountain | Cirsium fontinale var. fontinale | 8 | E | |
| Thistle, La Graciosa | Cirsium loncholepis | 8 | E | |
| Thistle, Loch Lomond coyote | Eryngium constancei | 8 | E | |
| Thistle, Mogollon | Cirsium parryi mogollonicum | 2 | Not Listed | |
| Thistle Mountain-slope | Cirsium scapanolepis | 6 | Not Listed | |
| Thistle, Mt. Hamilton | Cirsium fontinale campylon | 1 | Not Listed | |
| Thistle, Mt. Tamalpais | Cirsium hydrophilum vaseyi | 1 | Not Listed | |
| Thistle, Ownbey's | Cirsium ownbeyi | 6 | Not Listed | |
| Thistle, Pitcher's | Cirsium pitcheri | 3 | T | |
| Thistle, Sacramento Mountains | Cirsium vinaceum | 2 | T | |
| Thistle, slough | Cirsium crassicaule | 1 | Not Listed | |
| Thistle, Suisun | Cirsium hydrophilum var. hydrophilum | 8 | E | |
| Thistle, surf | Cirsium rhothophilum | 1 | Not Listed | |
| Thistle, [unnamed] | Cirsium davisii | 1 | Not Listed | |
| Thistle, [unnamed] | Cirsium hallii | 1 | Not Listed | |
| Thistle, [unnamed] | Cirsium hillii | 3 | Not Listed | |
| Thistle, [unnamed] | Cirsium longistylum | 6 | Not Listed | |
| Thistle, [unnamed] | Cirsium rydbergii | 6 | Not Listed | |
| Thistle, [unnamed] | Cirsium turneri | 2 | Not Listed | |
| Thistle, Virgin | Cirsium virginensis | 6 | Not Listed | |
| Thistle, Wright's marsh | Cirsium wrightii | 2 | C | |
| Thornmint, San Benito | Acanthomintha obovata obovata | 1 | Not Listed | |
| Thornmint, San Diego | Acanthomintha ilicifolia | 8 | T | |
| Thornmint, San Mateo | Acanthomintha obovata ssp. duttonii | 8 | E | |
| Thoroughwort, Cape Sable | Chromolaena frustrata | 4 | C | |
| Thoroughwort, [unnamed] | Eupatorium resinosum kentuckiense | 4 | Not Listed | |
| Thoroughwort, white-bracted, New England | Eupatorium leucolepis novae-angliae | 5 | Not Listed | |
| thrasher, Crissal | toxostoma crissale | Entire | 6 | Not Listed |
| thrasher, Le Conte's | toxostoma lecontei | Entire | 8 | Not Listed |
| Thrasher, San Joaquin LeConte's | Toxostoma lecontei macmillanorum | Entire | 1 | Not Listed |
| Thrasher, white-breasted | Ramphocinclus brachyurus | Entire | Foreign | E |
| Thread bug, ana wingless | Nesidiolestes ana | Entire | 1 | Not Listed |
| Thread bug, Mt. Tantalus wingless | Nesidiolestes insularis | Entire | 1 | Not Listed |
| Thread bug, pulchrus | Empicoris pulchrus | Entire | 1 | Not Listed |
| Thread bug, Robert's wingless | Nesidiolestes roberti | Entire | 1 | Not Listed |
| Thread bug, Selium wingless | Nesidiolestes selium | Entire | 1 | Not Listed |
| Three-awned grass, southern | Aristida simpliciflora | 4 | Not Listed | |
| Three-awned grass, [unnamed] | Aristida floridana | 4 | Not Listed | |
| Three-ridge, fat (mussel) | Amblema neislerii | Entire | 4 | E |
| Threetooth, Cape Fear | Triodopsis soelneri | Entire | 4 | Not Listed |
| Thrush, Bicknell's | Catharus bicknelli | Entire | 5 | Not Listed |
| Thrush, large Kauai (=kamao) | Myadestes myadestinus | Entire | 1 | E |
| Thrush, Molokai | Myadestes lanaiensis rutha | Entire | 1 | E |
| Thrush, New Zealand (wattlebird) | Turnagra capensis | Entire | Foreign | E |
| Thrush, small Kauai (=puaiohi) | Myadestes palmeri | Entire | 1 | E |
| Thrush, St. Lucia Forest | Cichlherminia iherminieri santaeluciae | Entire | Foreign | E |
| Thrush, Taita | Turdus olivaceus helleri | Entire | Foreign | E |
| Tickle-tongue, Shinner's | Zanthoxylum parvum | 2 | Not Listed | |
| Tickseed, golden wave | Coreopsis intermedia | 4 | Not Listed | |
| Tickseed, Lindheimer's | Desmodium lindheimeri | 2 | Not Listed | |
| Tick-trefoil, creamy | Desmodium ochroleucum | 4 | Not Listed | |
| Tick-trefoil, ground-spreading | Desmodium humifusum | 5 | Not Listed | |
| Tiger | Panthera tigris | Entire | Foreign | E |
| Tiger beetle, Barbara Ann's | Cicindela politula barbarannae | Entire | 2 | UR |
| Tiger beetle, Cazier's | Cicindela cazieri | Entire | 2 | Not Listed |
| Tiger beetle, cobblestone | Cicindela marginipennis | Entire | 5 | Not Listed |
| Tiger beetle, Columbia River | Cicindela columbica | Entire | 1 | Not Listed |
| Tiger beetle, Coral Pink Sand Dunes | Cicindela albissima | Entire | 6 | C |
| Tiger beetle, greenest | Cicindela tranquebarica viridissima | Entire | 1 | Not Listed |
| Tiger beetle, Guadalupe Mountains | Cicindela politula petrophila | Entire | 2 | UR |
| Tiger beetle, highlands | Cicindela highlandensis | Entire | 4 | C |
| Tiger beetle, Idaho dunes | Cicindela arenicola | Entire | 1 | Not Listed |
| Tiger beetle, Los Olmos | Cicindela nevadica olmosa | Entire | 2 | Not Listed |
| Tiger beetle, Maricopa | Cicindela oregona maricopa | Entire | 2 | Not Listed |
| Tiger beetle, neojuvenile | Cicindela obsoleta neojuvenalis | Entire | 2 | Not Listed |
| Tiger beetle, northeastern beach | Cicindela dorsalis dorsalis | Entire | 5 | T |
| Tiger beetle, oblivious | Cicindela latesignata obliviosa | Entire | 1 | Not Listed |
| Tiger beetle, Ohlone | Cicindela ohlone | Entire | 8 | E |
| Tiger beetle, Puritan | Cicindela puritana | Entire | 5 | T |
| Tiger beetle, Sacramento Valley | Cicindela hirticollis abrupta | entire | 8 | Not Listed |
| Tiger beetle, Salt Creek | Cicindela nevadica lincolniana | Entire | 6 | E |
| Tiger beetle, sandy beach | Cicindela hirticollis gravida | Entire | 1 | Not Listed |
| Tiger beetle, San Joaquin | Cicindela tranquebarica ssp. | Entire | 1 | Not Listed |
| Tiger beetle, Smyth's | Cicindela chlorocephala smythi | Entire | 2 | Not Listed |
| Tiger beetle, subtropical blue-black | Cicindela nigrocoerula subtropica | Entire | 2 | Not Listed |
| Tiger, Tasmanian | Thylacinus cynocephalus | Entire | Foreign | E |
| tightcoil, Crater Lake | Pristiloma arcticum ssp. crateris | Entire | 1 | Not Listed |
| Tightcoil Southern | Ogaridiscus subrupicola | Entire | 6 | Not Listed |
| Tight coin, Yates' | Ammonitella yatesi | Entire | 1 | Not Listed |
| Tinamou, Kalinowski's | Nothoprocta kalinowskii | Entire | NA | Not Listed |
| Tinamou, solitary | Tinamus solitarius | Entire | Foreign | E |
| Tit-spinetail, white-browed | Leptasthenura xenothorax | Entire | 9 | PE |
| Tit-tyrant, ash-breasted | Anairetes alpinus | Entire | 9 | PE |
| Toad, Amargosa | Bufo nelsoni | Entire | 8 | Not Listed |
| Toad, Arizona | Bufo microscaphus microscaphus | Entire | 2 | Not Listed |
| Toad, arroyo (=arroyo southwestern) | Bufo californicus (=microscaphus) | Entire | 8 | E |
| Toad, black | Bufo exsul | Entire | 1 | Not Listed |
| toad, Boreal | Anaxyrus boreas boreas | Southern Rocky Mountain DPS | 6 | Not Listed |
| Toad, Cameroon | Bufo superciliaris | Entire | Foreign | E |
| toad, Colorado River | bufo alvarius | Entire | 6 | Not Listed |
| toad, Couch's spadefoot | scaphiopus couchii | Entire | 6 | Not Listed |
| Toad, Houston | Bufo houstonensis | Entire | 2 | E |
| Toad, Monte Verde golden | Bufo periglenes | Entire | Foreign | E |
| Toad, Puerto Rican crested | Peltophryne lemur | Entire | 4 | T |
| Toads, African viviparous | Nectophrynoides spp. | Entire | Foreign | E |
| Toad, Sonoran green | Bufo retiformis | Entire | 2 | Not Listed |
| Toad, Western | Bufo boreas | Entire | 1 | Not Listed |
| Toad, Wyoming | Bufo baxteri (=hemiophrys) | Entire | 6 | E |
| toad, Yosemite | Anaxyrus canorus | Entire | 8 | C |
| Tody-tyrant, Kaempfer's | Hemitriccus kaempferi | Entire | Foreign | E |
| Tomistoma | Tomistoma schlegelii | Entire | Foreign | E |
| Toothwort, yellow-tubered | Cardamine gemmata | 1 | Not Listed | |
| Topminnow, barrens | Fundulus julisia | Entire | 4 | Not Listed |
| Topminnow, Gila (incl. Yaqui) | Poeciliopsis occidentalis | U.S.A. only | 2 | E |
| Topminnow, Plains | Fundulus sciadicus | Entire | 6 | Not Listed |
| Topminnow, whiteline | Fundulus albolineatus | Entire | 4 | Not Listed |
| Torreya, Florida | Torreya taxifolia | 4 | E | |
| Tortoise, angulated | Geochelone yniphora | Entire | Foreign | E |
| Tortoise, Bolson | Gopherus flavomarginatus | Entire | Foreign | E |
| Tortoise, desert | Gopherus agassizii | AZ south and east of Colorado River, and Mexico, when found outside of Mexico or said range in AZ | 8 | SAT |
| Tortoise, desert | Gopherus agassizii | Entire, except AZ south and east of Colorado River, and Mexico | 8 | T |
| Tortoise, desert | Gopherus agassizii | Sonoran | 2 | C |
| Tortoise, Galapagos | Geochelone nigra (=elephantopus) | Entire | Foreign | E |
| Tortoise, gopher | Gopherus polyphemus | eastern | 4 | C |
| Tortoise, gopher | Gopherus polyphemus | U.S.A. (Florida) | 4 | Not Listed |
| Tortoise, gopher | Gopherus polyphemus | Wherever found west of Mobile and Tombigbee Rivers in AL, MS, and LA | 4 | T |
| Tortoise, Madagascar radiated | Geochelone radiata | Entire | Foreign | E |
| Tortricid moth, Stevens' | Decodes stevensi | Entire | 6 | Not Listed |
| Tortugo, prieto | Ravenia urbanii | 4 | Not Listed | |
| Tortula, Ammon's | Tortula ammonsiana | 4 | Not Listed | |
| Totoaba (seatrout or weakfish) | Cynoscion macdonaldi | Entire | Foreign | E |
| Toucanet, yellow-browed | Aulacorhynchus huallagae | Entire | Foreign | UR |
| Towhee, Inyo California | Pipilo crissalis eremophilus | Entire | 8 | T |
| Towhee, San Clemente | Pipilo erythrophthalmus clementae | Entire | 1 | Not Listed |
| Towhee, Yuma brown | Pipilo fuscus relictus | Entire | 2 | Not Listed |
| Townsendia, Last Chance | Townsendia aprica | 6 | T | |
| Townsendia, sp. nov. ined. (gypsum) | Townsendia sp. | NM | 2 | Not Listed |
| Townsendia, sp. nov. ined. (Nye Co.) | Townsendia sp. | Nye Co. | 1 | Not Listed |
| Townsendia, sp. nov. ined. (WY) | Townsendia sp. | WY | 2 | Not Listed |
| Townsendia, sword | Townsendia spathulata | 6 | Not Listed | |
| Townsendia, [unnamed] | Townsendia jonesii lutea | 6 | Not Listed | |
| Townsendia, [unnamed] | Townsendia mensana | 6 | Not Listed | |
| Townsendia, [unnamed] | Townsendia rothrockii | 6 | Not Listed | |
| Tracaja | Podocnemis unifilis | Entire | Foreign | E |
| Tracyina, beaked | Tracyina rostrata | 1 | Not Listed | |
| Tree-fern (Tsatsa) | Cyathea lunulata | NA | Not Listed | |
| Tree-Finch, Floreana | Camarhynchus pauper | Entire | Foreign | E |
| Treefrog, Arizona | Hyla wrightorum | Huachuca/Canelo Population | 2 | C |
| Treefrog, pine barrens | Hyla andersonii | Florida | 4 | DO |
| Tree poppy, Channel Island | Dendromecon rigida harfordii | 1 | Not Listed | |
| Tree poppy, island | Dendromecon rigida rhamnoides | 1 | Not Listed | |
| Tree snail, Moloka`i | Partulina virgulata | Entire | 1 | Not Listed |
| Tree snail, Newcomb's | Newcombia canaliculata | Entire | 1 | Not Listed |
| Tree snail, Newcomb's | Newcombia cumingi | Entire | 1 | C |
| Tree snail, Newcomb's | Newcombia perkinsi | Entire | 1 | Not Listed |
| Tree snail, Newcomb's | Newcombia pfeifferi | Entire | 1 | Not Listed |
| Tree snail, Newcomb's | Newcombia sulcata | Entire | 1 | Not Listed |
| Tree snail, Newcomb's | Nucombia plicata | Entire | 1 | Not Listed |
| Trefoil, Heller's bird's-foot | Lotus unifoliolatus var. helleri | 4 | Not Listed | |
| Tre, lupine, San Mateo | Lupinus arboreus eximius | 1 | Not Listed | |
| Trembler, Martinique (thrasher) | Cinclocerthia ruficauda gutturalis | Entire | Foreign | E |
| trichocoronis, Wright's | trichocoronis wrightii | 6 | Not Listed | |
| Trillium, least, Ozark | Trillium pusillum ozarkanum | 4 | Not Listed | |
| Trillium, least, Virginia | Trillium pusillum virginianum | 5 | Not Listed | |
| Trillium, persistent | Trillium persistens | 4 | E | |
| Trillium, relict | Trillium reliquum | 4 | E | |
| Trillium, Texas | Trillium pusillum texanum | 2 | Not Listed | |
| Tropidocarpum, caper-fruited | Tropidocarpum capparideum | 1 | Not Listed | |
| Trout, Alvord cutthroat | Oncorhynchus clarki ssp. | Alvord | 1 | Not Listed |
| Trout, Apache | Oncorhynchus apache | Entire | 2 | T |
| Trout, Bonneville cutthroat | Oncorhynchus clarki utah | Entire | 6 | Not Listed |
| trout, brook | Salvelinus fontinalis | anadromous (lake-run) | 3 | Not Listed |
| Trout, bull | Salvelinus confluentus | Clackamas River subbasin and the mainstem Willamette River, from Willamette Falls to its points of confluence with the Columbia River, including Multnomah Channel | 1 | EXPN |
| Trout, bull | Salvelinus confluentus | U.S.A., conterminous, (lower 48 states) | 1 | T |
| Trout, California golden trout | Oncorhynchus mykiss aguabonita | Entire | 1 | Not Listed |
| Trout, Catlow Valley redband | Oncorhynchus mykiss ssp. | Catlow Valley | 1 | Not Listed |
| Trout, coastal cutthroat | Oncorhynchus clarki clarki | Umpqua R. (U.S.A._OR) naturally spawning populations in mainstem and tributaries | 1 | DR |
| trout, Coastal rainbow | oncorhynchus mykiss ssp. irideus | Entire | 7 | Not Listed |
| Trout, Colorado River cutthroat | Oncorhynchus clarki pleuriticus | Entire | 6 | Not Listed |
| Trout, Columbia River redband | Oncorhynchus mykiss gairdneri | Entire | 1 | Not Listed |
| Trout, Eagle Lake rainbow | Oncorhynchus mykiss aquilarum | entire | 8 | UR |
| Trout, Gila | Oncorhynchus gilae | Entire | 2 | T |
| Trout, Goose Lake redband | Oncorhynchus mykiss ssp. | Goose Lake | 1 | Not Listed |
| Trout, Great Basin redband | Oncorhynchus mykiss ssp. | Entire | 1 | Not Listed |
| trout, Greenback Cutthroat | Oncorhynchus clarki stomias | Entire | 6 | T |
| Trout, interior redband | Oncorhynchus mykiss gibbsi | Entire | 1 | Not Listed |
| Trout, Kern River rainbow | Oncorhynchus mykiss gilberti | Entire | 1 | Not Listed |
| Trout, Lahontan cutthroat | Oncorhynchus clarki henshawi | Entire | 8 | T |
| Trout, Little Kern golden | Oncorhynchus aguabonita whitei | Entire | 8 | T |
| Trout, McCloud R. redband | Oncorhynchus mykiss ssp. | McCloud R. | 1 | Not Listed |
| Trout, Paiute cutthroat | Oncorhynchus clarki seleniris | Entire | 8 | T |
| Trout, Rio Grande cutthroat | Oncorhynchus clarki virginalis | Entire | 2 | C |
| Trout, silver | Salvelinus agassizi | Entire | 5 | Not Listed |
| Trout, Snake River fine-spotted cutthroat | Oncorhynchus clarki ssp. | Snake River | 1 | Not Listed |
| Trout, Warner Valley redband | Oncorhynchus mykiss ssp. | Entire | 1 | Not Listed |
| Trout, westslope cutthroat | Oncorhynchus clarki lewisi | Entire | 6 | Not Listed |
| Trout, Willow/Whitehorse cutthroat | Oncorhynchus clarki ssp. | Willow/Whitehorse | 1 | Not Listed |
| Trout, yellowfin cutthroat | Oncorhynchus clarki macdonaldi | Entire | 6 | Not Listed |
| Trout, Yellowstone cutthroat | Oncorhynchus clarki bouvieri | Entire | 6 | Not Listed |
| Trumpet, Rawson's flaming | Collomia rawsoniana | 1 | Not Listed | |
| Trumpets, Texas | Acleisanthes crassifolia | 2 | Not Listed | |
| Tryonia, Amargosa | Tryonia variegata | Entire | 8 | UR |
| Tryonia, Brune's | Tryonia brunei | Entire | 2 | Not Listed |
| Tryonia, Grapevine Springs elongate | Tryonia margae | Entire | 1 | Not Listed |
| Tryonia, Grapevine Springs squat | Tryonia rowlandsi | Entire | 1 | Not Listed |
| Tryonia, grated | Tryonia clathrata | Entire | 8 | UR |
| Tryonia, mimic | Tryonia imitator | Entire | 1 | Not Listed |
| Tryonia, minute | Tryonia ericae | Entire | 8 | UR |
| Tryonia, Point of Rocks | Tryonia elata | Entire | 8 | UR |
| Tryonia, Quitobaquito | Tryonia quitobaquitae | Entire | 2 | Not Listed |
| Tryonia, robust | Tryonia robusta | Entire | 1 | Not Listed |
| Tryonia, sportinggoods | Tryonia angulata | Entire | 1 | UR |
| Tuatara | Sphenodon punctatus | Entire | Foreign | E |
| Tuatara, Brother's Island | Sphenodon guntheri | Entire | Foreign | E |
| Tuctoria, Greene's | Tuctoria greenei | 8 | E | |
| Tui chub, Lahontan Creek | Gila bicolor obesa | Entire | 1 | Not Listed |
| tui chub, Owens | Gila bicolor ssp. snyderi | Entire | 8 | E |
| Tule-pea, Delta | Lathyrus jepsonii jepsonii | 1 | Not Listed | |
| Tule perch, Russian River | Hysterocarpus traski pomo | Entire | 1 | Not Listed |
| Turaco, Bannerman's | Tauraco bannermani | Entire | Foreign | E |
| Turkish rugging | Chorizanthe staticoides chrysacantha | 1 | Not Listed | |
| Turtle, Alabama red-belly | Pseudemys alabamensis | Entire | 4 | E |
| Turtle, alligator snapping | Macroclemys temmincki | Entire | 4 | UR |
| Turtle, aquatic box | Terrapene coahuila | Entire | Foreign | E |
| Turtle, Arizona yellow mud | Kinosternon flavescens arizonense | Entire | 2 | Not Listed |
| Turtle, Barbour's map | Graptemys barbouri | Entire | 4 | Not Listed |
| Turtle, Big Bend mud | Kinosternon hirtipes murrayi | Entire | 2 | Not Listed |
| Turtle, black-knobbed map | Graptemys nigrinoda | Entire | 4 | Not Listed |
| Turtle, black softshell | Trionyx nigricans | Entire | Foreign | E |
| Turtle, Blanding's | Emydoidea blandingii | Entire | 6 | Not Listed |
| Turtle, bog (=Muhlenberg) | Clemmys muhlenbergii | Entire, except GA, NC, SC, TN, VA | 5 | T |
| Turtle, bog (=Muhlenberg) | Clemmys muhlenbergii | U.S.A. (GA, NC, SC, TN, VA) | 5 | SAT |
| Turtle, Brazilian sideneck | Phrynops hogei | Entire | Foreign | E |
| Turtle, Burmese peacock | Morenia ocellata | Entire | Foreign | E |
| Turtle, Cagle's map | Graptemys caglei | Entire | 2 | Not Listed |
| Turtle, Cat Island | Trachemys terrapen | Cat Island in the Bahamas | Foreign | E |
| Turtle, Central American river | Dermatemys mawii | Entire | Foreign | E |
| Turtle, Cuatro Cienegas softshell | Trionyx ater | Entire | Foreign | E |
| Turtle dove, Seychelles | Streptopelia picturata rostrata | Entire | Foreign | E |
| Turtle, false map | Graptemys pseudogeographica | Entire | 6 | Not Listed |
| Turtle, flattened musk | Sternotherus depressus | Black Warrior R. system upstream from Bankhead Dam | 4 | T |
| Turtle, geometric | Psammobates geometricus | Entire | Foreign | E |
| turtlehead, Cuthbert's | chelone cuthbertii | 4 | Not Listed | |
| Turtle, Illinois mud | Kinosternon flavescens spooneri | Entire | 3 | Not Listed |
| Turtle, Inagua Island | Trachemys stejnegeri malonei | Entire | Foreign | E |
| Turtle, Indian flap-shelled | Lissemys punctata punctata | Entire | Foreign | DO |
| Turtle, Indian sawback | Kachuga tecta tecta | Entire | Foreign | E |
| Turtle, Indian softshell | Trionyx gangeticus | Entire | Foreign | E |
| Turtle, Key striped mud | Kinosternon bauri bauri | Entire | 4 | Not Listed |
| Turtle, Mississippe redbelly | Pseudemys sp. | Entire | 4 | Not Listed |
| Turtle, northwestern pond | Clemmys marmorata marmorata | Entire | 1 | Not Listed |
| Turtle, Pascagoula map | Graptemys gibbonsi | Entire | 4 | Not Listed |
| Turtle, peacock softshell | Trionyx hurum | Entire | Foreign | E |
| Turtle, ringed map | Graptemys oculifera | Entire | 4 | T |
| Turtle, Sabine Ouachita map | Graptemys ouachitensis sabinensis | Entire | 2 | Not Listed |
| Turtle, short-necked or western swamp | Pseudemydura umbrina | Entire | Foreign | E |
| Turtle, Sonoyta mud | Kinosternon sonoriense longifemorale | Entire | 2 | C |
| Turtle, South American red-lined | Trachemys scripta callirostris | Entire | Foreign | E |
| Turtle, southwestern pond | Clemmys marmorata pallida | Entire | 1 | Not Listed |
| Turtle, spotted pond | Geoclemys hamiltonii | Entire | Foreign | E |
| Turtle, Texas map | Graptemys versa | Entire | 2 | Not Listed |
| Turtle, three-keeled Asian | Melanochelys tricarinata | Entire | Foreign | E |
| Turtle, western pond | Clemmys marmorata | Entire | NA | UR |
| Turtle, wood | Clemmys insculpta | Entire | NA | Not Listed |
| Turtle, yellow-blotched map | Graptemys flavimaculata | Entire | 4 | T |
| Turtle, yellow mud | Kinosternon flavescens flavescens | Entire | 3 | Not Listed |
| Twayblade, auricled | Listera auriculata | 5 | Not Listed | |
| Twinpod, dense | Physaria condensata | 6 | Not Listed | |
| Twinpod Duchesne River | Physaria stylosa | 6 | Not Listed | |
| Twinpod, Dudley Bluffs | Physaria obcordata | 6 | T | |
| Twinpod, Graham's | Physaria grahamii | 6 | Not Listed | |
| Twinpod Repand | Physaria repanda | 6 | Not Listed | |
| Twinpod, [unnamed] | Physaria integrifolia monticola | 6 | Not Listed | |
| Twinpod, [unnamed] | Physaria saximontana saximontana | 6 | Not Listed | |
| Twistflower, bracted | Streptanthus bracteatus | 2 | C | |
| Twistflower, Cutler's | Streptanthus cutleri | 2 | Not Listed | |
| Tyrannulet, Bananal | Serpophaga araguayae | Entire | NA | Not Listed |
| Uakari (all species) | Cacajao spp. | Entire | Foreign | E |
| Ufa-halomtano | Heritiera longipetiolata | 1 | Not Listed | |
| Uhiuhi | Caesalpinia kavaiense | 1 | E | |
| Ulunahele | Cyrtandra kauaiensis | 1 | Not Listed | |
| Underwing, precious | Catocala pretiosa pretiosa | Entire | 5 | Not Listed |
| Unicorn plant, dune | Proboscidea sabulosa | 2 | Not Listed | |
| Unicorn plant, many-flowered | Proboscidea spicata | 2 | Not Listed | |
| Urial | Ovis musimon ophion | Entire | Foreign | E |
| Uvillo | Eugenia haematocarpa | 4 | E | |
| Valerian, Guadalupe | Valeriana texana | 2 | Not Listed | |
| Valerian, marsh | Valeriana uliginosa | 4 | Not Listed | |
| Vanga, Pollen's | Xenopirostris polleni | Entire | Foreign | T |
| Vanga, Van Dam's | Xenopirostris damii | Entire | Foreign | T |
| Venus' fly-trap, [unnamed] | Dionaea muscipula | 4 | Not Listed | |
| Verbena Yellowstone Sand | Abronia ammophila | 6 | Not Listed | |
| Vertigo, Alabama | Vertigo alabamensis | Entire | 4 | Not Listed |
| Vertigo, callused | Vertigo arthuri | Entire | 6 | Not Listed |
| vertigo, Hoko | Vertigo sp | Entire | 1 | UR |
| Vertigo, Hubricht's | Vertigo hubrichti | Entire | 3 | Not Listed |
| Vertigo, Iowa Pleistocene | Vertigo sp. | Entire | 3 | Not Listed |
| Vertigo, Keys | Vertigo hebardi | Entire | 4 | Not Listed |
| Vertigo, Meramac River | Vertigo meramacensis | Entire | 3 | Not Listed |
| Vertigo, occult | Vertigo occulta | Entire | 3 | Not Listed |
| Vertigo, ovate | Vertigo ovata | Entire | 2 | Not Listed |
| Vervain, Red Hills | Verbena californica | 8 | T | |
| vervain, Riverbank | Verbena riparia | 5 | Not Listed | |
| Vervain, [unnamed] | Verbena tampensis | 4 | Not Listed | |
| Vespid | Euparagia | entire | 8 | Not Listed |
| Vetch, hairy pod | Vicia reverchonii | 2 | Not Listed | |
| Vetch, Hawaiian | Vicia menziesii | 1 | E | |
| Vetchling, Grimes | Lathyrus grimesii | 1 | Not Listed | |
| Vetch, Ocala | Vicia ocalensis | 4 | Not Listed | |
| Viceroy, Nevada | Limenitus archippus lahontani | Entire | 1 | Not Listed |
| Vicuna | Vicugna vicugna | Entire | Foreign | E |
| viguiera, San Diego County | viguiera laciniata | 1 | Not Listed | |
| Violet, felt-leaf | Viola tomentosa | 1 | Not Listed | |
| Violet, Flett's | Viola flettii | 1 | Not Listed | |
| Violet, Frank Smith's | Viola franksmithii | 6 | Not Listed | |
| Violet, Guadalupe Mountain | Viola guadalupensis | 2 | Not Listed | |
| Violet, limestone | Viola purpurea charlestonensis | 1 | Not Listed | |
| Violet, New England | Viola novae-angliae | 3 | Not Listed | |
| Violet, western bog | Viola primulifolia occidentalis | 1 | Not Listed | |
| Viper, Lar Valley | Vipera latifii | Entire | Foreign | E |
| Vireo, Arizona Bell's | Vireo bellii arizonae | Entire | 2 | Not Listed |
| Vireo, black-capped | Vireo atricapilla | Entire | 2 | E |
| vireo, Gray | Vireo vicinior | Entire | 8 | Not Listed |
| Vireo, least Bell's | Vireo bellii pusillus | Entire | 8 | E |
| Virgin's bower, Addison's | Clematis addisonii | 5 | Not Listed | |
| Virgin's bower, [unnamed] | Clematis gattingeri | 4 | Not Listed | |
| Viznaga | Ferocactus acanthodes acanthodes | 1 | Not Listed | |
| Vole, Amak tundra | Microtus oeconomus amakensis | Entire | 7 | Not Listed |
| Vole, Amargosa | Microtus californicus scirpensis | Entire | 8 | E |
| Vole, Arizona montane | Microtus montanus arizonensis | Entire | 2 | Not Listed |
| Vole, Ash Meadows montane | Microtus montanus nevadensis | Entire | 1 | Not Listed |
| Vole, beach | Microtus breweri | Entire | 5 | Not Listed |
| Vole, Block Island meadow | Microtus pennsylvanicus provectus | Entire | 5 | Not Listed |
| Vole, California red tree | Arborimus pomo | Entire | 1 | Not Listed |
| Vole, Florida salt marsh | Microtus pennsylvanicus dukecampbelli | Entire | 4 | E |
| Vole, Graham Mountains long-tailed | Microtus longicaudus leucophaeus | Entire | 2 | Not Listed |
| Vole, Hualapai Mexican | Microtus mexicanus hualpaiensis | Entire | 2 | E |
| Vole, Kentucky red-backed | Clethrionomys gapperi maurus | Entire | 4 | Not Listed |
| Vole, Kittatiny red-backed | Clethrionomys gapperi rupicola | Entire | 5 | Not Listed |
| Vole, Louisiana prairie | Microtus ochrogaster ludovicianus | Entire | 4 | Not Listed |
| Vole, Mojave river | Microtus californicus mohavensis | Entire | 1 | Not Listed |
| Vole, Montague tundra | Microtus oeconomus elymocetes | Entire | 7 | Not Listed |
| Vole, Navaho Mountain Mexican | Microtus mexicanus navaho | Entire | 2 | Not Listed |
| Vole, Owens Valley California | Microtus californicus vallicola | Entire | 1 | Not Listed |
| Vole, Pahranagat Valley montane | Microtus montanus fucosus | Entire | 1 | Not Listed |
| Vole, Penobscot meadow | Microtus pennsylvanicus shattucki | Entire | 5 | Not Listed |
| Vole, potholes meadow | Microtus pennsylvanicus kincaidi | Entire | 1 | Not Listed |
| Vole, Pymatuning red-backed | Clethrionomys gapperi paludicola | Entire | 5 | Not Listed |
| vole, red tree | Aborimus longicaudus | North Oregon Coast population | 1 | C |
| Vole, San Pablo California | Microtus californicus sanpabloensis | Entire | 1 | Not Listed |
| Vole, Shaw Island Townsend's | Microtus townsendii pugeti | Entire | 1 | Not Listed |
| Vole, southern rock | Microtus chrotorrhinus carolinensis | Entire | 5 | Not Listed |
| Vole, Stephens' California | Microtus californicus stephensi | Entire | 1 | Not Listed |
| Vole, St. Mathew | Microtus abbreviatus | Entire | 7 | Not Listed |
| Vole, Virgin River montane | Microtus montanus rivularis | Entire | 6 | Not Listed |
| Vole, white-footed | Arborimus albipes | Entire | 1 | Not Listed |
| Vole, Woodland | Microtus pinetorum | Entire | NA | Not Listed |
| vulture, Turkey | cathartes aura | Entire | 7 | Not Listed |
| Wahane | Pritchardia aylmer-robinsonii | 1 | E | |
| Wahaula heiau | Rauvolfia remotiflora | 1 | Not Listed | |
| Wake robin, Salmon Mountains | Trillium ovatum oettingeri | 1 | Not Listed | |
| Wallaby, banded hare | Lagostrophus fasciatus | Entire | Foreign | E |
| Wallaby, brindled nail-tailed | Onychogalea fraenata | Entire | Foreign | E |
| Wallaby, crescent nail-tailed | Onychogalea lunata | Entire | Foreign | E |
| Wallaby, Parma | Macropus parma | Entire | Foreign | E |
| Wallaby, western hare | Lagorchestes hirsutus | Entire | Foreign | E |
| Wallaby, yellow-footed rock | Petrogale xanthopus | Entire | Foreign | E |
| Walleye, southeastern | Stizostedion vitreum vitreum | Mobile River Drainage | 4 | Not Listed |
| Wallflower, Ben Lomond | Erysimum teretifolium | 8 | E | |
| Wallflower, coast | Erysimum ammophilum | 1 | Not Listed | |
| Wallflower, Contra Costa | Erysimum capitatum var. angustatum | 8 | E | |
| Wallflower, island | Erysimum insulare insulare | 1 | Not Listed | |
| Wallflower, Menzies' | Erysimum menziesii | 8 | E | |
| Wallflower, San Francisco | Erysimum franciscanum | 1 | Not Listed | |
| Wallflower, [unnamed] | Erysimum asperum angustatum | 7 | Not Listed | |
| walnut, California | Juglans californica var. californica | 1 | Not Listed | |
| Walnut (=Nogal), West Indian | Juglans jamaicensis | 4 | E | |
| Walnut, Northern California black | Juglans californica hindsii | 1 | Not Listed | |
| Walrus, Pacific | Odobenus rosmarus ssp. divergens | Entire | 7 | C |
| Wanderer, plain (=collared-hemipode) | Pedionomous torquatus | Entire | Foreign | E |
| Warbler, Aldabra (old world warbler) | Nesillas aldabranus | Entire | Foreign | E |
| Warbler, cerulean | Dendroica cerulea | Entire | 3 | Not Listed |
| Warbler, Colima | Vermivora crissalis | Entire | 2 | Not Listed |
| Warbler, Eiao Polynesian | Acrocephalus percernis aquilonis | Entire | 9 | E |
| Warbler, elfin-woods | Dendroica angelae | Entire | 4 | C |
| Warbler, Golden-winged | Vermivora chrysoptera | Entire | 3 | UR |
| Warbler, Kirtland's | Dendroica kirtlandii | Entire | 3 | E |
| Warbler, long-legged | Trichocichla rufa | Entire | Foreign | E |
| Warbler, Lucy's | Vermivora luciae | Entire | 1 | Not Listed |
| warbler, Macgillivray's | oporornis tolmiei | Entire | 7 | Not Listed |
| Warbler, Moorea Polynesian | Acrocephalus caffer longirostris | Entire | Foreign | UR |
| warbler, Nashville | vermivora ruficapilla | Entire | 4 | Not Listed |
| Warbler, nightingale reed (old world warbler) | Acrocephalus luscinia | Entire | 1 | E |
| Warbler, Rodrigues (old world warbler) | Bebrornis rodericanus | Entire | Foreign | E |
| Warbler, Seychelles (old world warbler) | Bebrornis sechellensis | Entire | Foreign | E |
| warbler, Sonoran yellow | dendroica petechia ssp. sonorana | Entire | 6 | Not Listed |
| Warbler, Stoddard's yellow-throated | Dendroica dominica stoddardi | Entire | 4 | Not Listed |
| warbler, Wilson's | wilsonia pusilla | Entire | 7 | Not Listed |
| Warbler (=wood), Bachman's | Vermivora bachmanii | Entire | 4 | E |
| Warbler (=wood), Barbados yellow | Dendroica petechia petechia | Entire | Foreign | E |
| Warbler (=wood), golden-cheeked | Dendroica chrysoparia | Entire | 2 | E |
| Warbler (=wood), Semper's | Leucopeza semperi | Entire | Foreign | E |
| warbler, Yellow | dendroica petechia ssp. brewsteri | Entire | 7 | Not Listed |
| Warea, sessile-leaved | Warea sessilifolia | 4 | Not Listed | |
| Warea, wide-leaf | Warea amplexifolia | 4 | E | |
| Wartyback, white (pearlymussel) | Plethobasus cicatricosus | Entire | 4 | E |
| Wartyback, white (pearlymussel) | Plethobasus cicatricosus | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 4 | EXPN |
| Wasp, Antioch mutillid | Myrmosula pacifica | Entire | 1 | Not Listed |
| Wasp, Antioch potter | Microdynerus arenicolus | Entire | 1 | Not Listed |
| Wasp, Antioch sphecid | Philanthus nasalis | Entire | 1 | Not Listed |
| Wasp, black-winged odynerus vespid | Odynerus nigripennis | Entire | 1 | Not Listed |
| Wasp, Kauai nesomimesan sphecid | Nesomimesa kauaiensis | Entire | 1 | Not Listed |
| Wasp, Nihoa eupelmus | Eupelmus nihoaensis | Entire | 1 | Not Listed |
| Wasp, Nihoa sclerodermus | Sclerodermus nihoaensis | Entire | 1 | Not Listed |
| Wasp, Niihau odynerus vespid | Odynerus niihauensis | Entire | 1 | Not Listed |
| Wasp, Perkins' nesomimesan sphecid | Nesomimesa perkinsi | Entire | 1 | Not Listed |
| Wasp, radulan odynerus vespid | Odynerus radula | Entire | 1 | Not Listed |
| Wasp, sand | Microbembex elegans | entire | 8 | Not Listed |
| Wasp, sand | Stictiella villegasi | entire | 8 | Not Listed |
| Wasp, shade-winged nesomimesan sphecid | Nesomimesa sciopteryx | Entire | 1 | Not Listed |
| Wasp, soror odynerus vespid | Odynerus soror | Entire | 1 | Not Listed |
| Watercress, Gambel's | Rorippa gambellii | 8 | E | |
| Watercress, San Luis | Rorippa coloradensis | 6 | Not Listed | |
| Waterdog, black warrior (=Sipsey Fork) | Necturus alabamensis | Entire | 4 | C |
| Waterdog, Neuse River | Necturus lewisi | Entire | 4 | Not Listed |
| Water-dropwort, giant | Oxypolis greenmanii | 4 | Not Listed | |
| water flea, hairy | Dumontia oregonensis | Entire | 1 | Not Listed |
| Water-hemlock, Bolander | Cicuta bolanderi | 1 | Not Listed | |
| Water-hyssop, Chickahominy | Bacopa simulans | 5 | Not Listed | |
| Water-hyssop, mat-forming | Bacopa stragula | 5 | Not Listed | |
| Waterleaf, ballhead, Thompson's | Hydrophyllum capitatum thompsonii | 1 | Not Listed | |
| Water-parsnip, Florida | Sium floridanum | 4 | Not Listed | |
| Water penny, Arizona | Psephenus arizonensis | Entire | 2 | Not Listed |
| Water penny, White Mountains | Psephenus montanus | Entire | 2 | Not Listed |
| Water-plantain, Kral's | Sagittaria secundifolia | 4 | T | |
| Water scavenger beetle, Chiricahua | Cymbiodyta arizonica | Entire | 2 | Not Listed |
| Water scavenger beetle, Leech's chaetarthrian | Chaetarthria leechi | Entire | 1 | Not Listed |
| Water scavenger beetle, Ricksecker's | Hydrochara rickseckeri | Entire | 1 | Not Listed |
| Water scavenger beetle, Seth Forest | Hydrochus sp. | Entire | 5 | Not Listed |
| Water scavenger beetle, Utah chaetarthrian | Chaetarthria utahensis | Entire | 6 | Not Listed |
| Water slater, Bennets Mill Cave | Caecidotea carolinensis | Entire | 4 | Not Listed |
| Water-umbel, Huachuca | Lilaeopsis schaffneriana var. recurva | 2 | E | |
| Waterweed, Nashville | Elodea linearis | 4 | Not Listed | |
| Waterweed, Nevada | Elodea nevadensis | 1 | Not Listed | |
| Waterweed, Schweinitz's | Elodea schweinitzii | 5 | Not Listed | |
| Waterweed, Truckee | Elodea brandegeae | 1 | Not Listed | |
| Water-willow, Cooley's | Justicia cooleyi | 4 | E | |
| Water-willow, Runyon's | Justicia runyonii | 2 | Not Listed | |
| Water-willow, thick-leaved | Justicia crassifolia | 4 | Not Listed | |
| Water-willow, [unnamed] | Justicia mortuifluminis | 5 | Not Listed | |
| Water-willow, Wright's | Justicia wrightii | 2 | Not Listed | |
| Wattle-eye, banded | Platysteira laticincta | Entire | Foreign | E |
| Wawae`iole | Huperzia mannii | 1 | E | |
| Wawae`iole | Huperzia (=Phlegmariurus) stemmermanniae | 1 | C | |
| Wawae`iole | Lycopodium (=Phlegmariurus) nutans | 1 | E | |
| Weasel, Florida long-tailed | Mustela frenata peninsulae | Entire | 4 | Not Listed |
| Weaver, Clarke's | Ploceus golandi | Entire | Foreign | E |
| Wedge, Arkansas | Triodopsis occidentalis | Entire | 4 | Not Listed |
| Wedgemussel, dwarf | Alasmidonta heterodon | Entire | 5 | E |
| Weevil, Antioch Dune | Dysticheus rotundicollis | Entire | 1 | Not Listed |
| Weevil, Blackburn's pentarthrum | Pentarthrum blackburni | Entire | 1 | Not Listed |
| Weevil, Blackburn's rhyncogonus | Rhyncogonus blackburni | Entire | 1 | Not Listed |
| Weevil, black rhyncogonus | Rhyncogonus stygius | Entire | 1 | Not Listed |
| Weevil, Blaisdell trigonoscuta | Trigonoscuta blaisdelli | Entire | 1 | Not Listed |
| Weevil, brown-tassel trigonoscuta | Trigonoscuta brunnotasselata | Entire | 1 | Not Listed |
| Weevil, Coral Beach Sand Dune | Trigonoscuta dorothea corallana | Entire | NA | Not Listed |
| Weevil, Dorothy's El Segundo Dune | Trigonoscuta dorothea dorothea | Entire | 1 | Not Listed |
| Weevil, Doyen's trigonoscuta dune | Trigonoscuta sp. | Entire | 1 | Not Listed |
| Weevil, Ford's rhyncogonus | Rhyncogonus segnis fordi | Entire | 1 | Not Listed |
| Weevil, Fort Ross trigonoscuta | Trigonoscuta rossi | Entire | 1 | Not Listed |
| Weevil, Giffard's rhyncogonus | Rhyncogonus giffardi | Entire | 1 | Not Listed |
| Weevil, Gifford's nesotocus | Nesotocus giffordi | Entire | 1 | Not Listed |
| Weevil, Kauai forest rhyncogonus | Rhyncogonus sylvicola | Entire | 1 | Not Listed |
| Weevil, Kauai nesotocus | Nesotocus kauaiensis | Entire | 1 | Not Listed |
| Weevil, Koebele's rhyncogonus | Rhyncogonus koebelei | Entire | 1 | Not Listed |
| Weevil, Lahaina rhyncogonus | Rhyncogonus lahainae | Entire | 1 | Not Listed |
| Weevil, Lanai rhyncogonus | Rhyncogonus lanaiensis | Entire | 1 | Not Listed |
| Weevil, Lange's El Segundo Dune | Onychobaris langei | Entire | 1 | Not Listed |
| Weevil, Laysan oodemas | Oodemas laysanensis | Entire | 1 | Not Listed |
| Weevil, Laysan rhyncogonus | Rhyncogonus bryani | Entire | 1 | Not Listed |
| Weevil, le`ie rhyncogonus | Rhyncogonus freycinetiae | Entire | 1 | Not Listed |
| Weevil, Molokai rhyncogonus | Rhyncogonus molokaiensis | Entire | 1 | Not Listed |
| Weevil, Munro's nesotocus | Nesotocus munroi | Entire | 1 | Not Listed |
| Weevil, mutated rhyncogonus | Rhyncogonus mutatus | Entire | 1 | Not Listed |
| Weevil, Necker oodemas | Oodemas neckeri | Entire | 1 | Not Listed |
| Weevil, Necker rhyncogonus | Rhyncogonus biformis | Entire | 1 | Not Listed |
| Weevil, Nelson's miloderes | Miloderes nelsoni | Entire | 1 | Not Listed |
| Weevil, Nihoa oodemas | Oodemas breviscapum | Entire | 1 | Not Listed |
| Weevil, Nihoa rhyncogonus | Rhyncogonus exsul | Entire | 1 | Not Listed |
| Weevil, Nihoa stenotrupis | Stenotrupis pritchardiae | Entire | 1 | Not Listed |
| Weevil, Oahu heteramphus fern | Heteramphus filicum | Entire | 1 | Not Listed |
| Weevil, Oahu nesiotes | Deinocossonus nesiotes | Entire | 1 | Not Listed |
| Weevil, obscure pentarthrum | Pentarthrum obscura | Entire | 1 | Not Listed |
| Weevil, obsolete rhyncogonus | Rhyncogonus obsoletus | Entire | 1 | Not Listed |
| Weevil, Olopua rhyncogonus | Rhyncogonus oleae | Entire | 1 | Not Listed |
| Weevil, Roth's dune | Trigonoscuta rothi algodones | entire | 8 | Not Listed |
| Weevil, Roth's dune | Trigonoscuta rothi imperialis | entire | 8 | Not Listed |
| Weevil, Roth's dune | Trigonoscuta rothi punctata | entire | 8 | Not Listed |
| Weevil, Roth's dune | Trigonoscuta rothi rothi | entire | 8 | Not Listed |
| Weevil, Rulien's miloderes | Miloderes rulieni | Entire | 1 | Not Listed |
| Weevil, Santa Catalina Island trigonscuta | Trigonoscuta catalina | Entire | 1 | Not Listed |
| Weevil, Santa Cruz Island shore | Trigonoscuta stantoni | Entire | 1 | Not Listed |
| Weevil, scaly rhyncogonus | Rhyncogonus squamiger | Entire | 1 | Not Listed |
| Weevil, Sharp's rhyncogonus | Rhyncogonus sharpi | Entire | 1 | Not Listed |
| Weevil, simple rhyncogonus | Rhyncogonus simplex | Entire | 1 | Not Listed |
| Weevil, slow rhyncogonus | Rhyncogonus segnis segnis | Entire | 1 | Not Listed |
| Weevil, striped rhyncogonus | Rhyncogonus vittatus | Entire | 1 | Not Listed |
| Weevil, tubercled rhyncogonus | Rhyncogonus tuberculatus | Entire | 1 | Not Listed |
| Weevil, wandering oodemas | Oodemas erro | Entire | 1 | Not Listed |
| Weevil, Welch's rhyncogonus | Rhyncogonus welchii | Entire | 1 | Not Listed |
| Weevil, Yorba Linda trigonoscuta | Trigonoscuta yorbalindae | Entire | 1 | Not Listed |
| Whale, Beluga | Delphinapterus leucas | Cook Inlet DPS—Cook Inlet, Alaska | NMFS | E |
| Whale, blue | Balaenoptera musculus | Entire | NMFS | E |
| Whale, bowhead | Balaena mysticetus | Entire | NMFS | E |
| Whale, finback | Balaenoptera physalus | Entire | NMFS | E |
| Whale, gray | Eschrichtius robustus | Eastern North Pacific Ocean--coastal and Bering, Beaufort, and Chukchi Seas | NMFS | DM |
| Whale, gray | Eschrichtius robustus | Entire, except eastern North Pacific Ocean--coastal and Bering, Beaufort, and Chukchi Seas | NMFS | E |
| Whale, humpback | Megaptera novaeangliae | Entire | NMFS | E |
| Whale, killer | Orcinus orca | Southern Resident DPS | NMFS | E |
| Whale, North Atlantic Right | Eubalaena glacialis | Entire | NMFS | E |
| Whale, North Pacific Right | Eubalaena japonica | Entire | NMFS | E |
| Whale, Sei | Balaenoptera borealis | Entire | NMFS | E |
| Whale, Southern Right | Eubalaena australis | Entire | NMFS | E |
| Whale, sperm | Physeter catodon (=macrocephalus) | Entire | NMFS | E |
| Whipbird, western | Psophodes nigrogularis | Entire | Foreign | E |
| Whipsnake, San Joaquin | Masticophis flagellum ruddocki | Entire | 1 | Not Listed |
| Whipsnake (=striped racer), Alameda | Masticophis lateralis euryxanthus | Entire | 8 | T |
| whiptail, Belding's orange-throated | cnemidophorus hyperythrus ssp. beldingi | Entire | 6 | Not Listed |
| Whiptail, canyon spotted | Cnemidophorus burti | Entire | 2 | Not Listed |
| Whiptail, coastal western | Cnemidophorus tigris multiscutatus | Entire | 1 | Not Listed |
| Whiptail, gray-checkered | Cnemidophorus dixoni | Entire | 2 | Not Listed |
| Whiptail, orange-throated | Cnemidophorus hyperythrus | Entire | 1 | Not Listed |
| Whirligig, Red Hills unique | Spanglerogyrus albiventris | Entire | 4 | Not Listed |
| White-eye, bridled | Zosterops conspicillatus conspicillatus | Entire | 1 | E |
| White-eye, Ghizo | Zosterops luteirostris | Entire | Foreign | UR |
| White-eye, Norfolk Island | Zosterops albogularis | Entire | Foreign | E |
| White-eye, Ponape greater | Rukia longirostra | Entire | Foreign | E |
| White-eye, Rota bridled | Zosterops rotensis | Entire | 1 | E |
| White-eye, Seychelles | Zosterops modesta | Entire | Foreign | E |
| White-eye, Truk greater | Rukia ruki | Entire | Foreign | Unlist |
| Whitefish Bear Lake | Prosopium abyssicola | Entire | 6 | Not Listed |
| Whitefish Bonneville | Prosopium spilonotus | Entire | 6 | Not Listed |
| whitefish mountain | Prosopium williamsoni | Big Lost River Distinct Population | 1 | Not Listed |
| whitefish mountain | Prosopium williamsoni | Entire | 1 | Not Listed |
| whitefish, Pygmy | prosopium coulterii | Entire | 6 | Not Listed |
| White-tailed prairie dog | Cynomys leucurus | Entire | 6 | Not Listed |
| White-wicky | Kalmia cuneata | 4 | Not Listed | |
| Whitlow-grass, Standley | Draba standleyi | 2 | Not Listed | |
| Whitlow-grass, Stanley | Draba trichocarpa | 1 | Not Listed | |
| Whitlow-grass, stolon | Draba sobolifera | 6 | Not Listed | |
| Whitlow-grass, [unnamed] | Draba subalpina | 6 | Not Listed | |
| Whitlow-grass, Zion | Draba asprella zionensis | 6 | Not Listed | |
| Whitlow-wort, Ahart's | Paronychia ahartii | 1 | Not Listed | |
| Whitlow-wort, bushy | Paronychia congesta | 2 | Not Listed | |
| Whitlow-wort, McCart's | Paronychia maccartii | 2 | Not Listed | |
| Whitlow-wort, papery | Paronychia chartacea | 4 | T | |
| Whitlow-wort, [unnamed] | Draba exunguiculata | 6 | Not Listed | |
| Whitlow-wort, [unnamed] | Paronychia rugelii interior | 4 | Not Listed | |
| Whitlow-wort, Wilkinson's | Paronychia wilkinsonii | 2 | Not Listed | |
| Wild-buckwheat, Apache | Eriogonum apachense | 2 | Not Listed | |
| Wild-buckwheat, Badlands | Eriogonum hylophilum | 6 | Not Listed | |
| Wild-buckwheat, Brandegee | Eriogonum brandegei | 6 | Not Listed | |
| Wild-buckwheat, bushy | Eriogonum suffruticosum | 2 | Not Listed | |
| Wild-buckwheat, Cimarron | Eriogonum aliquantum | 2 | Not Listed | |
| wild buckwheat, clay-loving | Eriogonum pelinophilum | 6 | E | |
| Wild-buckwheat, Comb Wash | Eriogonum clavellatum | 6 | Not Listed | |
| Wild-buckwheat, corymbed, Davidse | Eriogonum corymbosum davidsei | 6 | Not Listed | |
| Wild-buckwheat, corymbed, Reveal | Eriogonum corymbosum revealianum | 6 | Not Listed | |
| Wild-buckwheat, Cronquist | Eriogonum cronquistii | 6 | Not Listed | |
| Wild-buckwheat, Darrov's | Eriogonum darrovii | 2 | Not Listed | |
| Wild-buckwheat, desert | Eriogonum deserticola | 1 | Not Listed | |
| Wild-buckwheat, dinosaur | Eriogonum lonchophyllum saurinum | 6 | Not Listed | |
| Wild-buckwheat, Divide | Eriogonum intermontanum | 6 | Not Listed | |
| Wild-buckwheat, dwarf | Eriogonum nanum | 6 | Not Listed | |
| Wild-buckwheat, ephedra | Eriogonum ephedroides brevicaule | 6 | Not Listed | |
| Wild-buckwheat, Fredonia | Eriogonum mortonianum | 2 | Not Listed | |
| Wild-buckwheat, gypsum | Eriogonum gypsophilum | 2 | T | |
| Wild-buckwheat, Irion County | Eriogonum nealleyi | 2 | Not Listed | |
| Wild-buckwheat, lance leaf | Eriogonum lancifolium | 6 | Not Listed | |
| Wild-buckwheat, limestone | Eriogonum eremicum | 6 | Not Listed | |
| Wild-buckwheat, Logan | Eriogonum loganum | 6 | Not Listed | |
| Wild-buckwheat, Matthew's | Eriogonum corymbosum matthewsae | 6 | Not Listed | |
| Wild-buckwheat, Ostlund | Eriogonum ostlundii | 6 | Not Listed | |
| Wild-buckwheat, Panguitch | Eriogonum panguicense alpestre | 6 | Not Listed | |
| Wild-buckwheat, Ripley | Eriogonum ripleyi | 2 | Not Listed | |
| Wild-buckwheat, San Carlos | Eriogonum capillare | 2 | Not Listed | |
| Wild-buckwheat, sand-loving | Eriogonum ammophilum | 6 | Not Listed | |
| Wild-buckwheat, sandstone | Eriogonum jamesii rupicola | 6 | Not Listed | |
| Wild-buckwheat, Smith | Eriogonum smithii | 6 | Not Listed | |
| Wild-buckwheat, southern mountain | Eriogonum kennedyi var. austromontanum | 8 | T | |
| Wild-buckwheat, spreading | Eriogonum lonchophyllum | 6 | Not Listed | |
| Wild-buckwheat, Thompson | Eriogonum thompsonae thompsonae | 6 | Not Listed | |
| Wild-buckwheat, Thompson, Atwood's | Eriogonum thompsonae atwoodii | 2 | Not Listed | |
| Wild-buckwheat, Thompson, white-flow | Eriogonum thompsonae albiflorum | 6 | Not Listed | |
| Wild-buckwheat, [unnamed] | Eriogonum ericifolium ericifolium | 2 | Not Listed | |
| Wild-buckwheat, [unnamed] | Eriogonum flavum aquilinum | 7 | Not Listed | |
| Wild-buckwheat, Widstoe | Eriogonum aretioides | 6 | Not Listed | |
| Wild-buckwheat, Zion, coccineum | Eriogonum zionis coccineum | 2 | Not Listed | |
| Wild-buckwheat, Zion, zionis | Eriogonum zionis zionis | 2 | Not Listed | |
| wild coffee, Oahu (=kopiko) | Psychotria hexandra ssp. oahuensis var. oahuensis | 1 | PE | |
| Wild indigo, Apalachicola | Baptisia megacarpa | 4 | Not Listed | |
| Wild indigo, hairy | Baptisia calycosa villosa | 4 | Not Listed | |
| Wild indigo, [unnamed] | Baptisia riparia | 4 | Not Listed | |
| Wild pea, Bullfrog Mountain | Lathyrus hitchcockianus | 1 | Not Listed | |
| Wild-quinine, wavyleaf | Parthenium radfordii | 4 | Not Listed | |
| Wild-rice, Texas | Zizania texana | 2 | E | |
| Willow, Arizona | Salix arizonica | 2 | Not Listed | |
| Willow, Florida | Salix floridana | 4 | Not Listed | |
| Willowherb, Nevada | Epilobium nevadense | 6 | Not Listed | |
| Willowherb, Snow Mountain | Epilobium nivium | 1 | Not Listed | |
| Willow, peach-leaved | Salix amygdaloides | NA | Not Listed | |
| Willow, round-leaf | Salix ovalifolia glacialis | 7 | Not Listed | |
| Willow, sandbar, inside-outside | Salix interior exterior | 5 | Not Listed | |
| Willow, [unnamed] | Salix fluviatilis | 1 | Not Listed | |
| Winged spike | Elliptio nigella | Entire | 4 | Not Listed |
| Wire-lettuce, Malheur | Stephanomeria malheurensis | 1 | E | |
| Wire-lettuce, Schott's | Stephanomeria schottii | 2 | Not Listed | |
| Wireweed | Polygonella basiramia | 4 | E | |
| Witch-alder, dwarf | Fothergilla gardenii | 4 | Not Listed | |
| Wolf, Alexander Archipelago | Canis lupus ligoni | Entire | 7 | Not Listed |
| Wolfberry, silver | Lycium puberulum berberioides | 2 | Not Listed | |
| Wolfberry, Texas | Lycium texanum | 2 | Not Listed | |
| Wolf, gray | Canis lupus | Northern Rocky Mountain Gray Wolf Distinct Population Segment; Montana, Wyoming, Idaho, eastern Washington, eastern Oregon, and north central Utah | 6 | DM |
| Wolf, gray | Canis lupus | U.S.A.: All of AL, AR, CA, CO, CT, DE, FL, GA, KS, KY, LA, MA, MD, ME, MO, MS, NC, NE, NH, NJ, NV, NY, OK, PA, RI, SC, TN, VA, VT and WV; those portions of AZ, NM, and TX not included in an experimental population as set forth below; and portions of IA, IN, IL, ND, OH, OR, SD, UT, and WA as follows: (1) Southern IA, (that portion south of the centerline of Highway 80); (2) Most of IN (that portion south of the centerline of Highway 80); (3) Most of IL (that portion south of the centerline of Highway 80); (4) Western ND (that portion south and west of the Missouri River upstream to Lake Sakakawea and west of the centerline of Highway 83 from Lake Sakakawea to the Canadian border); (5) Most of OH (that portion south of the centerline of Highway 80 and east of the Maumee River at Toledo); (6) Western OR (that portion of OR west of the centerline of Highway 395 and Highway 78 north of Burns Junction and that portion of OR west of the centerline of Highway 95 south of Burns Junction); (7) Western SD (that portion south and west of the Missouri River); (8) Most of Utah (that portion of UT south and west of the centerline of Highway 84 and that portion of UT south of Highway 80 from Echo to the UT / WY Stateline); and (9) Western WA (that portion of WA west of the centerline of Highway 97 and Highway 17 north of Mesa and that portion of WA west of the centerline of Highway 395 south of Mesa). Mexico. | 6 | E |
| Wolf, gray | Canis lupus | U.S.A. (MN) | 3 | DM |
| Wolf, gray | Canis lupus | U.S.A. (portions of AZ, NM and TX - see section 17.84(k)) | 2 | EXPN |
| Wolf, gray | Canis lupus | U.S.A. (WY see 17.84 (i) and (n)) | 6 | EXPN |
| Wolf, gray | Canis lupus | Western Great Lakes Distinct Population Segment; Minnesota, Wisconsin, and Michigan; the eastern half of North Dakota and South Dakota; the northern half of Iowa; the northern portions of Illinois and Indiana; and the northwestern portion of Ohio. | 3 | DM |
| Wolf, maned | Chrysocyon brachyurus | Entire | Foreign | E |
| Wolf, red | Canis rufus | Entire, except where listed as experimental populations below | 4 | E |
| Wolf, red | Canis rufus | U.S.A. (portions of NC and TN_see 17.84(c)(9)) | 4 | EXPN |
| Wolf spider, Lake Placid funnel | Sosippus placidus | Entire | 4 | Not Listed |
| Wolverine, California | Gulo gulo luteus | Entire | 1 | Not Listed |
| Wolverine, North American | Gulo gulo luscus | Entire | 6 | C |
| Wombat, Queensland hairy-nosed (incl. Barnard's) | Lasiorhinus krefftii (formerly L. barnardi and L. gillespiei) | Entire | Foreign | E |
| Woodlandsnail, Cooke's Peak | Ashmunella macromphala | Entire | 2 | Not Listed |
| Woodlandsnail, Hacheta Grande | Ashmunella hebardi | Entire | 2 | Not Listed |
| Woodland-star, San Clemente Island | Lithophragma maximum | 8 | E | |
| Wood nymph, Carson Valley | Cercyonis pegala carsonensis | Carson Valley | 8 | Not Listed |
| Wood nymph, sthenele | Cercyonis sthenele sthenele | Entire | 1 | Not Listed |
| Wood nymph, White River | Cercyonis pegala ssp. | White River | 1 | Not Listed |
| woodpecker, Black-backed | picoides arcticus | Entire | 7 | Not Listed |
| woodpecker, Downy | picoides pubescens | Entire | 7 | Not Listed |
| woodpecker, Gila | melanerpes uropygialis | Entire | 6 | Not Listed |
| Woodpecker, helmeted | Dryocopus galeatus | Entire | Foreign | UR |
| Woodpecker, imperial | Campephilus imperialis | Entire | Foreign | E |
| Woodpecker, ivory-billed | Campephilus principalis | entire | 4 | E |
| Woodpecker, Okinawa | Dendrocopus noguchii | Entire | Foreign | UR |
| woodpecker, Pileated | dryocopus pileatus | Entire | 6 | Not Listed |
| Woodpecker, red-cockaded | Picoides borealis | Entire | 4 | E |
| woodpecker, Three-toed | picoides tridactylus | Entire | 6 | Not Listed |
| Woodpecker, Tristam's | Dryocopus javensis richardsi | Entire | Foreign | E |
| Wood-quail, gorgeted | Odontophorus strophium | Entire | 9 | PE |
| Woodrat, Alleghany | Neotoma magister | Entire | 5 | UR |
| Woodrat, Key Largo | Neotoma floridana smalli | Entire | 4 | E |
| Woodrat, Monterey dusky-footed | Neotoma fuscipes luciana | Entire | 1 | Not Listed |
| Woodrat, riparian (=San Joaquin Valley) | Neotoma fuscipes riparia | Entire | 8 | E |
| Woodrat, San Diego desert | Neotoma lepida intermedia | Entire | 1 | Not Listed |
| Woodrat, San Francisco dusky-footed | Neotoma fuscipes annectens | Entire | 1 | Not Listed |
| Woodrat, Santa Catalina Mountains | Neotoma mexicana bullata | Entire | 2 | Not Listed |
| Woodrat, Southern Appalachian eastern | Neotoma floridana haematoreia | Entire | 4 | Not Listed |
| Woodrat, White Sands | Neotoma micropus leucophaea | Entire | 2 | Not Listed |
| Woodsia, Oregon | Woodsia oregana cathcartiana | 3 | Not Listed | |
| Wood snail, Franklin Mountain | Ashmunella pasonis | Entire | 2 | Not Listed |
| Woodstar, Chilean | Eulidia yarrellii | Entire | Foreign | E |
| Woodstar, Esmeraldas | Chaetocercus berlepschi | Entire | 9 | PE |
| Wood-swallow, Palau white-breasted | Artamus leucorhynchus pelewensis | Entire | Foreign | Unlist |
| Woolly-star, Hoover's | Eriastrum hooveri | 8 | DP | |
| Woolly-star, Santa Ana River | Eriastrum densifolium ssp. sanctorum | 8 | E | |
| Wooly-pod, Bear Valley | Astragalus leucolobus | 1 | Not Listed | |
| Wooly-pod, black | Astragalus funereus | 1 | Not Listed | |
| Wooly-sunflower, Barstow | Eriophyllum mohavense | 1 | Not Listed | |
| Wooly-sunflower, Congdon's | Eriophyllum congdonii | 1 | Not Listed | |
| Wooly-sunflower, Ft. Tejon | Eriophyllum lanatum hallii | 1 | Not Listed | |
| Wooly-sunflower, Nevin's | Eriophyllum nevinii | 1 | Not Listed | |
| Wooly-sunflower, Yosemite | Eriophyllum nubigenum | 1 | Not Listed | |
| Wooly-threads, San Joaquin | Monolopia (=Lembertia) congdonii | 8 | E | |
| Wormwood, Aleutian | Artemisia aleutica | 7 | Not Listed | |
| Wormwood, Northern | Artemisia borealis var. wormskioldii | 1 | C | |
| Wormwood, [unnamed] | Artemisia globularia lutea | 7 | Not Listed | |
| Wormwood, [unnamed] | Artemisia glomerata subglabra | 7 | Not Listed | |
| Woundfin | Plagopterus argentissimus | Entire, except Gila R. drainage, AZ, NM | 6 | E |
| Woundfin | Plagopterus argentissimus | Gila R. drainage, AZ, NM | 6 | EXPN |
| Wren, Appalachian Bewick's | Thryomanes bewickii altus | Entire | 5 | Not Listed |
| Wren, Cactus | Campylorhynchus brunneicapillus | Entire | 1 | Not Listed |
| Wren, Guadeloupe house | Troglodytes aedon guadeloupensis | Entire | Foreign | E |
| Wren, Niceforo's | Thryothorus nicefori | Entire | NA | Not Listed |
| Wren, San Clemente Bewick's | Thryomanes bewickii leucophrys | Entire | 1 | Not Listed |
| Wren, San Diego cactus | Campylorhynchus brunneicapillus couesi | Entire | 1 | Not Listed |
| Wren, St. Lucia house | Troglodytes aedon mesoleucus | Entire | Foreign | E |
| Xyris, karst pond | Xyris longisepala | 4 | Not Listed | |
| Yak, wild | Bos mutus (=grunniens m.) | Entire | Foreign | E |
| Yampah, adobe | Perideridia pringlei | 1 | Not Listed | |
| Yampah, Gairdner's | Perideridia gairdneri gairdneri | 1 | Not Listed | |
| Yampah, Mother Lode | Perideridia bacigalupii | 1 | Not Listed | |
| Yampah, narrow-seeded | Perideridia leptocarpa | 1 | Not Listed | |
| Yampah, red-root | Perideridia erythrorhiza | 1 | Not Listed | |
| Yellow-cress, Columbia | Rorippa columbiae | 1 | UR | |
| Yellow-eyed grass, Drummond's | Xyris drummondii | 4 | Not Listed | |
| Yellow-faced bee, andrenoid | Hylaeus andrenoides | Entire | 1 | Not Listed |
| Yellow-faced bee, anomalous | Hylaeus anomala | Entire | 1 | Not Listed |
| Yellow-faced bee, anthricinan | Hylaeus anthracinus | Entire | 1 | C |
| Yellow-faced bee, assimulans | Hylaeus assimulans | Entire | 1 | C |
| Yellow-faced bee, Blackburn's | Hylaeus blackburni | Entire | 1 | Not Listed |
| Yellow-faced bee, bluewing | Hylaeus caeruleipennis | Entire | 1 | Not Listed |
| Yellow-faced bee, bristlefront | Nesoprosopis setosifrons | Entire | 1 | Not Listed |
| Yellow-faced bee, broadhead | Hylaeus laticeps | Entire | 1 | Not Listed |
| Yellow-faced bee, chlorostictan | Hylaeus chlorosticata | Entire | 1 | Not Listed |
| Yellow-faced bee, comes | Hylaeus comes | Entire | 1 | Not Listed |
| Yellow-faced bee, conehead | Hylaeus coniceps | Entire | 1 | Not Listed |
| Yellow-faced bee, connected | Hylaeus connectens | Entire | 1 | Not Listed |
| Yellow-faced bee, crabronoid | Hylaeus crabronoides | Entire | 1 | Not Listed |
| Yellow-faced bee, darkwing | Hylaeus fuscipennis | Entire | 1 | Not Listed |
| Yellow-faced bee, difficult | Hylaeus difficilis | Entire | 1 | Not Listed |
| Yellow-faced bee, dimidiatan | Hylaeus dimidiata | Entire | 1 | Not Listed |
| Yellow-faced bee, easy | Hylaeus facilis | Entire | 1 | C |
| Yellow-faced bee, erythrodeme | Hylaeus erythrodemas | Entire | 1 | Not Listed |
| Yellow-faced bee, Fern | Hylaeus filicum | Entire | 1 | Not Listed |
| Yellow-faced bee, finitiman | Hylaeus finitima | Entire | 1 | Not Listed |
| Yellow-faced bee, furry | Hylaeus pubescens | Entire | 1 | Not Listed |
| Yellow-faced bee, Haleakala | Hylaeus haleakalae | Entire | 1 | Not Listed |
| yellow-faced bee, Hawaiian | Hylaeus kuakea | Entire | 1 | C |
| yellow-faced bee, Hawaiian | Hylaeus mana | Entire | 1 | C |
| Yellow-faced bee, hilaris | Hylaeus hilaris | Entire | 1 | C |
| Yellow-faced bee, hirsute | Hylaeus hirsutula | Entire | 1 | Not Listed |
| Yellow-faced bee, hostile | Hylaeus hostilis | Entire | 1 | Not Listed |
| Yellow-faced bee, hulan | Hylaeus hula | Entire | 1 | Not Listed |
| Yellow-faced bee, insignis | Hylaeus insignis | Entire | 1 | Not Listed |
| Yellow-faced bee, Kauai | Hylaeus kauaiensis | Entire | 1 | Not Listed |
| Yellow-faced bee, Koa | Hylaeus koae | Entire | 1 | Not Listed |
| Yellow-faced bee, Kona | Hylaeus kona | Entire | 1 | Not Listed |
| Yellow-faced bee, Laetan | Hylaeus laeta | Entire | 1 | Not Listed |
| Yellow-faced bee, Lanai | Hylaeus angustula | Entire | 1 | Not Listed |
| Yellow-faced bee, longhead | Hylaeus longiceps | Entire | 1 | C |
| Yellow-faced bee, Maui | Nesoprosopis mauiensis | Entire | 1 | Not Listed |
| Yellow-faced bee, melanothrix | Nesoprosopis melanothrix | Entire | 1 | Not Listed |
| Yellow-faced bee, Molokai | Nesoprosopis neglecta | Entire | 1 | Not Listed |
| Yellow-faced bee, monocolor | Nesoprosopis homeochroma | Entire | 1 | Not Listed |
| Yellow-faced bee, mutatan | Nesoprosopis mutata | Entire | 1 | Not Listed |
| Yellow-faced bee, obscuratan | Hylaeus obscurata | Entire | 1 | Not Listed |
| Yellow-faced bee, Ombrias | Hylaeus ombrias | Entire | 1 | Not Listed |
| Yellow-faced bee, pele | Nesoprosopis pele | Entire | 1 | Not Listed |
| Yellow-faced bee, Perkin's | Hylaeus perkinsiana | Entire | 1 | Not Listed |
| Yellow-faced bee, perspicuan | Hylaeus perspicua | Entire | 1 | Not Listed |
| Yellow-faced bee, psammobian | Hylaeus psammobia | Entire | 1 | Not Listed |
| Yellow-faced bee, rugulose | Nesoprosopis rugulosa | Entire | 1 | Not Listed |
| Yellow-faced bee, satellus | Hylaeus satellus | Entire | 1 | Not Listed |
| Yellow-faced bee, simple | Hylaeus simplex | Entire | 1 | Not Listed |
| Yellow-faced bee, snowy | Nesoprosopis nivalis | Entire | 1 | Not Listed |
| Yellow-faced bee, specular | Hylaeus specularis | Entire | 1 | Not Listed |
| Yellow-faced bee, sphecodoid | Hylaeus sphecodoides | Entire | 1 | Not Listed |
| Yellow-faced bee, unique | Hylaeus unica | Entire | 1 | Not Listed |
| Yellow-faced bee, very | Hylaeus flavifrons | Entire | 1 | Not Listed |
| Yellow-faced bee, vicinan | Hylaeus vicina | Entire | 1 | Not Listed |
| Yellow-faced bee, volatile | Hylaeus volatilis | Entire | 1 | Not Listed |
| Yellow-faced bee, yellow-foot | Hylaeus flavipes | Entire | 1 | Not Listed |
| Yellowhead, desert | Yermo xanthocephalus | 6 | T | |
| Yellowshow, Wright's | Amoreuxia wrightii | 2 | Not Listed | |
| Yellowthroat, Brownsville common | Geothlypis trichas insperata | Entire | 2 | Not Listed |
| Yellowthroat, saltmarsh common | Geothlypis trichas sinuosa | Entire | 1 | Not Listed |
| Yerba de zanja | Ruppia anomala | 4 | Not Listed | |
| Yerba santa, Lompoc | Eriodictyon capitatum | 8 | E | |
| Yew, Florida | Taxus floridana | 4 | Not Listed | |
| Yew, Pacific | Taxus brevifolla | NA | Not Listed | |
| Zarzarilla | Schrankia portoricensis | 4 | Not Listed | |
| Zebra, Grevy's | Equus grevyi | Entire | Foreign | T |
| Zebra, Hartmann's mountain | Equus zebra hartmannae | Entire | Foreign | T |
| Zebra, mountain | Equus zebra zebra | Entire | Foreign | E |
| Ziziphus, Florida | Ziziphus celata | 4 | E | |
| Zoroapteran, Swezey's | Zorotypus swezeyi | Entire | 1 | Not Listed |
Last updated: May 25, 2012
