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Ambrosia pumila
''Ambrosia pumila'' is a rare species of herbaceous perennial plant known by the common names San Diego ragweed and San Diego ambrosia. It is native to far southern California, Baja California, and Baja California Sur. It grows in floodplains and open grasslands in proximity to wetland areas.〔(Flora of North America Vol. 21 Page 18 ''Ambrosia pumila'' (Nuttall) A. Gray, Proc. Amer. Acad. Arts. 17: 217. 1882. )〕〔(Tropicos, specimen listing for ''Ambrosia pumila'' (Nutt.) A. Gray )〕〔Shreve, F. & I. L. Wiggins. 1964. Vegetation and Flora of the Sonoran Desert 2 vols. Stanford University Press, Stanford〕〔(Biota of North America Program 2014 county distribution map )〕
==Distribution==
It is adapted to dry habitat, but only on upper floodplain fringes, or adjoining depressions containing vernal pools or similar structures.〔USFWS. (Final Rule Designating Critical Habitat for ''Ambrosia pumila'' (San Diego ambrosia). ) ''Federal Register'' November 30, 2010.〕 It is a plant of open habitat and is not tolerant of heavy shade.〔
Today it is known from 19 populations. Fourteen of them are in San Diego County, two exist in Riverside County, and there are three south of the border in Baja California and Baja California Sur in Mexico.〔(The Nature Conservancy )〕 Most of its native habitat has been consumed by urbanization and development. It is also threatened by agriculture. This is a federally listed endangered species of the United States.(Calflora taxon report, University of California: ''Ambrosia pumila'' (San Diego ambrosia, San Diego ragweed) )
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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