Status of meadow milkvetch (Astragalus diversifolius) in south-central Wyoming

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Systematic surveys of Meadow milkvetch (Astragalus diversifolius) were conducted in 2008 using mapping of playa vegetation and digital orthophotographs to identify potential habitat across south-central Wyoming. The species is now known from three extant occurrences in the Great Divide Basin, totaling about 8000 plants that span about 187 acres. The historic occurrence in the Green River Basin was not relocated. The results provide the basis for ranking Astragalus diversifolius and assessing its status in the state. The new Wyoming occurrences greatly broadened the known species’ distribution. No immediate impacts have been identified under energy and mineral development in the state, but there are a number of existing and potential developments in surrounding lands to which the species may be vulnerable.

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Reference Code: U09HEI01IDUS

Full Citation: Heidel, B. 2009. Status of Meadow milkvetch (Astragalus diversifolius) in south-central
Wyoming. Prepared for the Bureau of Land Management, Rawlins and Rock Springs Field
Offices. Wyoming Natural Diversity Database, Laramie, WY. 23 pp. plus appendices

Location: ELECTRONIC FILE BOTANY: PLANT SPECIES: {Astragalus diversifolius}; FLORISTIC REPRINT FILE