Astragalus ampullarioides

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Shivwits milkvetch
Astragalus ampullarioides.jpg

Critically Imperiled (NatureServe)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fabales
Family: Fabaceae
Genus: Astragalus
Species: A. ampullarioides
Binomial name
Astragalus ampullarioides
(S.L.Welsh) S.L.Welsh, 1998

Astragalus ampullarioides is a rare species of milkvetch known by the common name Shivwits milkvetch. It was previously classified as a variety of Astragalus eremiticus.[1] It is endemic to Washington County, Utah, where it is known from only seven populations.[1] Estimates of the total number of individuals range from 1000[2] to 4200.[3] The species occurs in desert scrub and woodlands on the Chinle Formation.[4] It is a federally listed endangered species.

This is a perennial herb growing erect to a maximum height near half a meter. It produces about 45 flowers on an erect inflorescence.[4] It is pollinated by bees.[1]

Much of the plant's range is within the bounds of Zion National Park and Shivwits tribal lands.[4] Other parts of the range are unprotected. Threats to the species include habitat loss to development and agriculture, herbivory by rabbits, cattle grazing, off-road vehicles, quarrying, and introduced plant species.[2][4]

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