Wyoming Ecological Services
Mountain-Prairie Region

Federally Listed, Proposed & Candidate Species | Species of Concern | Migratory Birds | All Species By County



Federally Listed, Proposed and Candidate Species


Fremont County Rockcress
(Boechera pusilla)

Staus: Candidate

Fremont County RockcressPhoto Credit: Bonnie Heidel, WYNDD


Fremont County Rockcress Area Of Influence

Section 7 Range Symbol

Wyoming Area Of Influence
Fremont County Rockcress

Potential Distribution in Wyoming

For Species Lists, please use the IPaC System

Area Of Influence

Areas Of Influence (AOI) identify areas where any project located within should consider potential effects to the Threatened, Endangered, Proposed, and Candidate species and designated and proposed Critical Habitat, in reference to Section 7 of the Endangered Species Act of 1973, as amended.  AOI typically encompass larger areas than simply where the species is known to exist because of direct and indirect effects to the species and their habitat.  It is important to consider potential effects to the species and their habitat within these larger areas.  Action agencies are encouraged to refer to the Service’s Information, Planning, and Conservation System (IPAC) or contact the FWS Wyoming Ecological Services Office for additional information.  (AOI boundaries based on the best available data at time of development.  AOI will be updated as new information becomes available).

Download Area Of Influence GIS Data or Area Of Influence Google Earth layers


Species Information

Fremont County rockcress (Boechera pusilla)is a candidate for listing under the ESA (76 FR 33924; June 9, 2011).  This perennial herb has several long, slender stems that grow along the ground.  Its small, light lavender, four-petaled flowers blossom from May to mid-June.  Fremont County rockcress is endemic to sparsely vegetated, coarse, granitic soil pockets in exposed granite-pegmatite outcrops, with slopes generally less than 10 degrees.  The only known population of Fremont County rockcress is located at 8,000–8,100 feet in elevation on lands administered by the Bureau of Land Management in the southern foothills of the Wind River Range.  The primary threats to this species have not yet been fully identified.  However, threats appear to be acting on the species as evidenced by a recent decline in population size.  Threats to the species may be related to drought, disease, or other factors.  The Service does not maintain a list of "qualified" surveyors, but can refer those wishing to become familiar with Fremont County rockcress to experts who can provide training or services.

Recent Actions

- 12 Month Finding - Five Wyoming Plants

- 90 Day Finding - Five Wyoming Plants

Last updated: April 10, 2015