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''Astragalus scaphoides'' (Bitterroot milkvetch), is a flowering plant in the family Fabaceae, found only in a small area of southwest Montana and adjacent parts of Idaho. It grows on shallow, south-facing slopes, in semi-arid sage scrub. ''Astragalus scaphoides'' is a perennial herbaceous plant, with pinnate leaves. The pale yellow flowers open in May and are visited by several species of bumblebees and solitary bees, including species from the genera ''Osmia'' and ''Anthophora''. Plants can be found near Lemhi Pass on the Montana-Idaho border, and near Bannack State Park in Montana. Plants tend to flower in alternate years,〔Gurevitch, J., S. M. Scheiner, and G. A. Fox. The Ecology of Plants, Second Edition. Sinauer Associates, Inc., Sunderland MA USA〕 similarly to mast years in grasses and trees. ==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 scaphoides」の詳細全文を読む スポンサード リンク
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