| 词条 | Astragalus anxius |
| 释义 |
|status = G1 |status_system = TNC |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Rosids |ordo = Fabales |familia = Fabaceae |genus = Astragalus |species = A. anxius |binomial = Astragalus anxius |binomial_authority = R.J. Meinke & Kaye |}}Astragalus anxius is a rare species of milkvetch known by the common names troubled milkvetch and Ash Valley milkvetch. It is endemic to northern Lassen County, California, where it grows in the volcanic soil of the Modoc Plateau. It was formally described in 1992.[1] There are only 6 known occurrences, some of which are threatened by livestock trampling.[2] DescriptionAstragalus anxius is a perennial herb forming a matted patch of slender, delicate stems no longer than 20 centimeters. It is coated thinly in wavy hairs. The leaves are a few centimeters long and made up of several leaflets. The inflorescence contains 7 to 15 pealike flowers. Each flower is bicolored, the lower petals usually white and the upper banner petals purple to purple-veined white. The fruit is a hairy, oval-shaped legume pod up to half a centimeter long which dries to a papery texture. References1. ^Meinke, R. J. and T. N. Kaye. (1992). Taxonomic assessment of Astragalus tegetarioides (Fabaceae) and a new related species from northern California. Madroño 39:3 193-204. 2. ^The Nature Conservancy External links
8 : Astragalus|Endemic flora of California|Flora of the Great Basin|Modoc Plateau|Modoc National Forest|Natural history of Lassen County, California|Plants described in 1992|Critically endangered flora of California |
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