| 词条 | Astragalus ampullarioides |
| 释义 |
|image = Astragalus ampullarioides.jpg |name = Shivwits milkvetch |status = G1 |status_system = TNC |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Rosids |ordo = Fabales |familia = Fabaceae |genus = Astragalus |species = A. ampullarioides |binomial = Astragalus ampullarioides |binomial_authority = (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] References1. ^1 2 Breinholt, J. W., et al. (2009). Population genetic structure of an endangered Utah endemic, Astragalus ampullarioides (Fabaceae). American Journal of Botany 96 661. {{Taxonbar|from=Q2868497}}{{Astragalus-stub}}2. ^1 The Nature Conservancy 3. ^Zion National Park 4. ^1 2 3 Center for Plant Conservation {{webarchive |url=https://web.archive.org/web/20101215110034/http://www.centerforplantconservation.org/collection/cpc_viewprofile.asp?CPCNum=10827 |date=December 15, 2010 }} 7 : Astragalus|Flora of Utah|Washington County, Utah|Zion National Park|Endemic flora of the United States|Critically endangered flora of the United States|Plants described in 1998 |
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