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Clarkia franciscana : ウィキペディア英語版 | Clarkia franciscana
''Clarkia franciscana'' is a rare species of flowering plant in the evening primrose family known by the common name Presidio clarkia. It is endemic to the San Francisco Bay Area of California, where it is known only from two populations at the Presidio of San Francisco and three occurrences in Oakland.〔(Center for Plant Conservation )〕 The plant is known only from serpentine soils. ==Distribution== ''Clarkia franciscana'' is a federally listed endangered species. The two San Francisco populations are on land which is protected from development but is affected by many other factors including invasive plant species, trampling, and landscaping of vegetation.〔 The three Oakland populations are probably the remnants of one population that was fragmented by development in the heavily altered urban habitat.〔 The largest of the three occurrences is partially protected at Redwood Regional Park, but the other two are on privately owned property which is proposed to undergo some development.〔〔(Center for Biological Diversity Press Release ) June 26, 2007〕 Construction of housing is proposed on the site, with less than an acre being left undeveloped as a compromise between developers and environmental advocates.〔Zamora, J. H. (Dispute over flower: habitat vs. housing ) ''San Francisco Chronicle'' June 5, 2007〕
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