Biology:Astragalus anxius
| Astragalus anxius | |
|---|---|
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fabales |
| Family: | Fabaceae |
| Subfamily: | Faboideae |
| Genus: | Astragalus |
| Species: | A. anxius
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| Binomial name | |
| Astragalus anxius Meinke & Kaye
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| Synonyms[2] | |
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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.[3]
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.[4]
Taxonomy
Astragalus 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]
Distribution
Astragalus 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
- ↑ 1.0 1.1 1.2 The Nature Conservancy
- ↑ 2.0 2.1 "Astragalus tegetarioides var. anxius (Meinke & Kaye) S.L.Welsh", Plants of the World Online (Royal Botanic Gardens, Kew), http://www.plantsoftheworldonline.org/taxon/urn:lsid:ipni.org:names:1160688-2, retrieved 2023-04-06
- ↑ 3.0 3.1 3.2 Meinke, Robert J.; Kaye, Thomas N. (1992). "Taxonomic assessment of Astragalus tegetarioides (Fabaceae) and a new related species from northern California". Madroño 39 (3): 193–204.
- ↑ Park, Hyun-Jung; Kim, Hyun Young; Yoon, Kun-Ho; Kim, Kyung Soo; Shim, Insop (2009). "The Effects of Astragalus Membranaceus on Repeated Restraint Stress-induced Biochemical and Behavioral Responses". The Korean Journal of Physiology & Pharmacology 13 (4): 315–319. doi:10.4196/kjpp.2009.13.4.315. PMID 19885016.
External links
- Jepson Manual Treatment - Astragalus anxius
- USDA Plants Profile; Astragalus anxius
- Astragalus anxius - Photo gallery
Wikidata ☰ Q4811199 entry
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