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Eriogonum crosbyae : ウィキペディア英語版 | Eriogonum crosbyae
''Eriogonum crosbyae'' is a species of wild buckwheat known by the common name Crosby's buckwheat. It is native to southcentral Oregon and northwestern Nevada in the United States.〔(''Eriogonum crosbyae''. ) The Nature Conservancy.〕 Some treatments include plants in Montana and Idaho as members of this species.〔(''Eriogonum crosbyae''. ) Flora of North America.〕 This plant was first discovered in the Guano Valley in Lake County, Oregon, in 1978 by Bureau of Land Management botanist Virginia Crosby, and it was named for her in 1981.〔(''Eriogonum crosbyae''. ) Oregon Department of Agriculture.〕 This perennial herb forms mats of stems from a branching caudex. It is hairless to hairy to woolly in texture and sometimes glandular, and it is greenish or grayish in color. The woolly leaves are up to 3 centimeters long. The inflorescence is a headlike cluster of yellow or cream flowers.〔 This plant only grows in tuff, a soil composed of volcanic ash,〔 or tuffaceous sandstone.〔 The substrate is light tan to white in color. There are few other plants around but species in the habitat may include ''Astragalus'' spp., ''Atriplex confertifolia'', ''Chrysothamnus nauseosus'', ''Tetradymia glabrata'', ''Artemisia'' spp., ''Elymus cinereus'', ''Stanleya viridiflora'', ''Sphaeralcea'' sp., ''Ipomopsis congesta'', ''Astragalus tiehmii'',〔(''Eriogonum crosbyae''. ) Center for Plant Conservation.〕 and ''Cryptantha schoolcraftii''.〔(''Eriogonum crosbyae''. ) Bureau of Land Management.〕 Mining is a significant threat to this species. Most Nevada occurrences are on land leased by mining operations. This plant's specific habitat type is targeted for mining.〔 Mining has already destroyed some occurrences.〔〔(''Eriogonum crosbyae''. ) Nevada Natural Heritage Program.〕 "Range improvement projects"〔〔〔 are another type of threat. Off-road vehicles are in use in the area. The plant also appears to have low recruitment.〔 ==References==
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