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Photo by Bill Gray; Bill Gray
Sources: ESRI, USGS, NOAA
Hamilton's milkvetch
Astragalus hamiltonii
NatureServe conservation status
Global (G-rank): G2
State (S-rank): S2
External links
Species range
Tertiary Duchesne River and Wasatch, and less commonly Cretaceous Mowry Shale and Dakota, and other formations at 1600 to 1940 m in the juniper-pinyon community of w. Uintah Co.; a Uinta Basin endemic (Welsh et al. 2015).
Estimate from download of data from Utah Rare Plant Database on March 16th 2021.
Geocat 427 observations: Extent of Occurrence: 956.913 km2.
Range extent increased greatly by collections east of Vernal by S. Goodrich/ J Brunson June 2011
Specimens collected at deadman's bench by K Thorne 1982 were misidentified specimens of A. lonchocarpus.
Threats or limiting factors
Some populations on private and tribal where threats are relatively unknown. Known livestock grazing and OHV use on BLM lands - which harbors over half of mapped occurrences
possible threats from climate change such as drought and severe weather events.
