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Astragalus brauntonii : ウィキペディア英語版 | Astragalus brauntonii
''Astragalus brauntonii'' is a rare species of milkvetch known by the common name Braunton's milkvetch. It is endemic to California, where it is known from fewer than 20 extant occurrences in the hills and mountains surrounding the Los Angeles Basin in Southern California.〔(Topanga Watershed Report ) accessed 7/4/2010〕 This is a federally listed endangered species in the United States. ==Distribution== ''Astragalus brauntonii'' is a plant of the coastal prairie grasslands, coastal sage scrub, and chaparral plant communities of the region. It is often found growing in disturbed areas, especially in carbonate soils areas.〔(Center for Plant Conservation Profile )〕 The 16 known remaining populations are found in the southwestern Transverse Ranges (eastern Santa Monica Mountains, east end Simi Hills, south base San Gabriel Mountains), northern Peninsular Ranges (northwest side Santa Ana Mountains) — within Los Angeles, Orange, and Ventura Counties. 〔(USDA counties distribution map ) . accessed 1.8.2013〕 They appear to be extirpated from the southern Channel Islands.
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