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Astragalus anxius
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 is critically imperiled.[1] It was formally described in 1992.[3] 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.[4] TaxonomyAstragalus anxius was first described in 1992, when it was separated from Astragalus tegetarioides.[3] Some sources treat it as a variety of A. tegetarioides, A. tegetarioides var. anxius.[2] DistributionAstragalus anxius is endemic to northern Lassen County, California, where it grows in the volcanic soil of the Modoc Plateau.[3] There are 97 observations as of 2019 reported to Calflora.org, some of which are threatened by livestock trampling.[1] References
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