Английская Википедия:Astragalus anxius

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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.[2]

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.[3]

Taxonomy

Astragalus anxius was first described in 1992, when it was separated from Astragalus tegetarioides.[2] Some sources treat it as a variety of A. tegetarioides, A. tegetarioides var. anxius.[4]

Distribution

Astragalus anxius is endemic to northern Lassen County, California, where it grows in the volcanic soil of the Modoc Plateau.[2] There are 97 observations as of 2019 reported to Calflora.org, some of which are threatened by livestock trampling.[1]

References

Шаблон:Reflist

External links

Шаблон:Taxonbar