Wyoming Ecological Services
Mountain-Prairie Region

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Federally Listed, Proposed and Candidate Species


Ute Ladies'-tresses
(Spiranthes diluvialis)

Status: Threatened

Ute Ladies'-TressesPhoto Credit: FWS


Ute Ladies'-tresses Section 7 Range

Section 7 Range Symbol

Wyoming Section 7 Range

Potential Distribution in Wyoming

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Section 7 Range

Under Section 7 of the Endangered Species Act of 1973, Federal agencies, or project proponents whose actions have a Federal nexus (e.g., Federal funding, permit, or lease), must consult with the U. S. Fish and Wildlife Service if their actions “may affect” listed species (endangered, threatened, proposed, candidate) or their habitat.  Section 7 species ranges identify those areas on the landscape where agencies or proponents should consider potential effects, both direct and indirect, to the species and their habitat.  These Section 7 species ranges typically encompass larger areas than specific locations where listed species are known to occur.  Project proponents are encouraged to refer to the Service’s Information, Planning, and Conservation System (IPAC) website at http://ecos.fws.gov/ipac/ or to contact the FWS Wyoming Ecological Services Office for additional information http://www.fws.gov/wyominges/ :307-772-2374.  (Section 7 Range boundaries based on the best available data at time of development.  Section 7 Ranges will be updated as new information becomes available.)

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Species Information

Ute ladies’-tresses (Spiranthes diluvialis) is a perennial orchid, 8 to 20 inches tall, with white or ivory flowers clustered into a spike arrangement at the top of the stem.  Ute ladies’-tresses typically blooms from late July through August.  However, it may bloom in early July or still be in flower as late as early October, depending on location and climatic conditions.  Ute ladies’-tresses is endemic to moist soils near wetland meadows, springs, lakes, and perennial streams where it colonizes early successional point bars or sandy edges.  The elevation range of known occurrences is 4,200 to 7,000 feet (although no known populations in Wyoming occur above 5,500 feet).  Soils where Ute ladies’-tresseshave been found typically range from fine silt/sand, to gravels and cobbles, as well as to highly organic and peaty soil types.  Ute ladies’-tressesis not found in heavy or tight clay soils or in extremely saline or alkaline soils. Ute ladies’-tresses typically occurs in small, scattered groups found primarily in areas where vegetation is relatively open. 

Many orchid species take 5 to 10 years to reach reproductive maturity; this appears to be true for Ute ladies’-tresses (FR 57 2048).  Furthermore, reproductively mature plants do not flower every year.  For these reasons, 2 to 3 years of surveys are necessary to determine presence or absence of Ute ladies’-tresses.  Surveys should be conducted by knowledgeable botanists trained in conducting rare plant surveys.
Last updated: March 21, 2014