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''Viola walteri'', the prostrate blue violet, is a perennial plant in the violet family (Violaceae). It is native to Southeastern and Appalachian North America. It is generally uncommon throughout its range, with populations becoming fragmented in the north. ''Viola walteri'' is found in rich calcareous forests and woodlands, often in dry rocky areas. It is a spring ephemeral, flowering March through May. It distinguished by its creeping, rooting stolons, which is thought to be indicative of it being transitional between the caulescent and acaulescent violets. Two varieties of ''Viola walteri'' are distinguished, and are sometimes considered distinct species. These are: *''Viola walteri'' House var. ''appalachiensis'' (L.K. Henry) L.E. McKinney ex S.P. Grund & B.L. Isaac *''Viola walteri'' House var. ''walteri'' ==References== *(Digital Atlas of Virginia Flora ) 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「Viola walteri」の詳細全文を読む スポンサード リンク
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