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''Astragalus iodanthus'' is a species of flowering plant in the legume family, Fabaceae, known by the common names Humboldt River milkvetch〔(''Astragalus iodanthus''. ) USDA PLANTS.〕 and violet milkvetch.〔(''Astragalus iodanthus''. ) NatureServe. 2012.〕 It is native to the western United States, where its range includes California, Idaho, Nevada, Oregon, and Utah.〔 It grows on hills and in valleys〔(''A. iodanthus'' var. ''iodanthus''. ) The Jepson eFlora 2013.〕 in barren sandy and volcanic soils〔(''A. iodanthus'' var. ''diaphanoides''. ) The Jepson eFlora 2013.〕 in habitat such as sagebrush.〔(''A. iodanthus'' var. ''iodanthus''. ) Calflora 2013.〕 This perennial herb produces several prostrate stems up to 40 centimeters long. The compound leaves are made up of 9 to 21 rounded or teardrop-shaped leaflets each up to 1.8 centimeters long. The inflorescence is a raceme of flowers in shades of reddish purple or white to cream with a purple tip on the keel petal. There are up to 25 flowers in a raceme, and they are crowded when first blooming but spread out over time. The fruit is a legume pod up to 4 centimeters long, becoming dark, mottled, and papery to leathery with age.〔(''Astragalus iodanthus''. ) The Jepson eFlora 2013.〕 There are two varieties of this species: *var. ''diaphanoides'' (snake milkvetch) has a denser coating of rough hairs, particularly along the leaf edges and midrib.〔 *var. ''iodanthus'' is less hairy, having rough hairs mainly in the inflorescence.〔 ==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「Astragalus iodanthus」の詳細全文を読む スポンサード リンク
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