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Astragalus (plant)

Fruits and seeds of Astragalus hamosus

Astragalus is a large genus of over 3,000 species[2] of herbs and small shrubs, belonging to the legume family Fabaceae and the subfamily Faboideae. It is the largest genus of plants in terms of described species.[3] The genus is native to temperate regions of the Northern Hemisphere. Common names include milkvetch (most species), locoweed (in North America, some species)[4] and goat's-thorn (A. gummifer, A. tragacantha). Some pale-flowered vetches (Vicia spp.) are similar in appearance, but they are more vine-like than Astragalus.

Description

Most species in the genus have pinnately compound leaves.[5] There are annual and perennial species. The flowers are formed in clusters in a raceme, each flower typical of the legume family, with three types of petals: banner, wings, and keel. The calyx is tubular or bell-shaped.[6][7]

Taxonomy

The genus was formally described in 1753 by Carl Linnaeus in his Species Plantarum.[8]

The name Astragalus is Greek, an old name for this group of plants which were believed to have a positive effect on goat milk production.[9]

Selected species

Ecology

Astragalus species are used as food plants by the larvae of some Lepidoptera species including many case-bearing moths of the genus Coleophora: C. cartilaginella, C. colutella, C. euryaula, and C. onobrychiella feed exclusively on Astragalus, C. astragalella and C. gallipennella feed exclusively on the species Astragalus glycyphyllos, and C. hippodromica is limited to Astragalus gombo.[citation needed]

Uses

Traditional medicine

Astragalus has been used in traditional Chinese medicine over centuries to treat various disorders, but there is no high-quality evidence that it is effective or safe for any medical purpose.[11][12]

Phytochemicals and supplements

Extracts of astragalus root include diverse phytochemicals, such as saponins and isoflavone flavonoids, which are purported in traditional practices to increase lactation in nursing mothers.[13] There is no valid clinical evidence to indicate such use is effective or safe for the mother or infant.[13] Dietary supplement products containing astragalus extracts may not have been adequately tested for efficacy, safety, purity or consistency.[13] The root extracts of astragalus may be used in soups, teas or sold in capsules.[11]