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Stylocline citroleum
''Stylocline citroleum'' is a rare species of flowering plant in the aster family known by the common name oil neststraw.
==Distribution==
It is endemic to Kern County, California, where it is known from about 46 occurrences on and around the Elk Hills Oil Field. The occurrences are patchy and variable in size, and some sources consider them to be part of a single widely spread metapopulation.〔(The Nature Conservancy )〕 The species has been collected from coastal San Diego County, but any occurrences there are probably now extirpated.〔〔(Flora of North America )〕
The plant has been known for over one hundred years, and the type specimen was collected in 1935, but it was not described to science as a distinct species until 1992.〔(San Joaquin Valley Endangered Species Recovery Program ). CSU Stanislaus.〕〔Morefield, J. D. (1992). Three new species of ''Stylocline'' (Asteraceae:Inuleae) from California and the Mojave Desert. ''Madroño'' 39:114-130.〕
''Stylocline citroleum'' grows in the valley saltbush scrub ecosystem in the sandy flats and clay soils of the San Joaquin Valley in areas developed into oil fields, the inspiration for the common and scientific names of the species.〔 The plant probably evolved as a hybrid of mountain neststraw (''Stylocline gnaphaloides'') and California filago (''Filago californica''), and it is almost always found growing alongside one or both of its parent species.〔
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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