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. There are only 6 known occurrences, some of which are threatened by livestock trampling. Description Astragalus 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. References External links Jepson Manual Treatment - Astragalus anxius USDA Plants Profile; Astragalus anxius Astragalus anxius - Photo gallery anxius Endemic flora of California Flora of the Great Basin ~ ~ Natural history of Lassen County, California Plants described in 1992 Critically endangered flora of California