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''Ivesia rhypara'' is a species of flowering plant in the rose family known by the common name grimy mousetail, or grimy ivesia. It is native to Oregon and Nevada in the United States.〔(''Ivesia rhypara''. ) The Nature Conservancy.〕 This perennial herb grows from woody roots and a brancing caudex.〔(''Ivesia rhypara''. ) Nevada Natural Heritage Program.〕 It has hairy, overlapping, compound basal leaves and stems up to 15 centimeters long. At the ends of the stems are clustered white or pale yellow flowers. Blooming occurs in May through October.〔〔(''Ivesia rhypara''. ) Oregon Department of Agriculture.〕 There are two varieties of this plant. The var. ''rhypara'' grows on barren tuff and var. ''shellyi'' grows in rock cracks and crevices on pumice and tuff.〔 When the plants grow in rock fissures they sometimes appear to be lined up in rows.〔(''Ivesia rhypara'' var. ''rhypara''. ) Center for Plant Conservation.〕 Associated plants include ''Purshia tridentata'', ''Poa sandbergii'',〔 ''Gilia congesta'', ''Sitanion hystrix'', ''Scutellaria nana'', and ''Eriophyllum lanatum''.〔 Threats to this species, particularly var. ''rhypara'', include gold mining, as the habitat contains gold deposits. Other threats include cattle, off-road vehicles, fire suppression, and loss of pollinating insects.〔 The plant gets the name ''rhypara'' ("grimy" in Greek) both from its dusty appearance and from its discoverer, James W. Grimes.〔〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ivesia rhypara」の詳細全文を読む スポンサード リンク
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