Known also as Shem milkvetch, Astragalus ampullarioides (syn. A. eremeticus var ampullarioides), was listed as endangered on the same date as A. holmgreniorum, i.e. on 9/28/2001, although the two species are not sympatric and grow on different soils and have different associated species. The Shivwits milkvetch grows on Chinle formation derived soils. It is a restricted endemic that only occurs in Utah, primarily in the southwestern area of the state (with a disjunct occurrence in Zion National Park).This is one of the relatively few species of Astragalus that suffers from herbivory. Its true taxonomic status with another yellow-flowered Astragalus that occurs in the area has yet to be studied.As with A. holmgreniorum, it was federally listed as endangered with critical habitat but its 2001 listing did not include that designation so it was included in a lawsuit to compel that action. Designation of critical habitat was then finally made as a result of that lawsuit on 12/27/2006 and a recovery plan finalized several months prior.May 1, 2004, Washington County, Utah, elev. approx. 3,040 ft.
