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''Symphyotrichum cordifolium'', syn. ''Aster cordifolius'' (common names heartleaf aster or common blue wood aster), is a species of flowering plant in the family Asteraceae, native to eastern North America. An herbaceous perennial, it can be readily found along forest edges and in open areas, as well in urban areas and in cultivation. It sometimes produces a naturally occurring hybrid with ''S. puniceum'' named ''Symphyotrichum'' × ''tardiflorum'' where their ranges overlap. The composite flowers, which typically have bluish to rarely white ray florets and light yellow disc florets that eventually turn purple, emerge in August and persist into October. File:Symphyotrichum cordifolium (syn. Aster cordifolius).png File:Heartleaf aster 2.jpg File:Heartleaf aster 3.jpg ==Distribution and habitat== ''S. cordifolium'' is present in a wide area, from Manitoba in the north west, east to Nova Scotia and Maine, south to Georgia and Alabama and west to Oklahoma. It grows primarily in mesic sites with soils that are rocky to loamy, but generally rich, at heights ranging from sea level along the coastal plain up to in the Appalachians. It can be found on open wooded slopes, along the banks of streams, on moist ledges, in swampy woods, along the borders of beech-maple and oak-hickory forests, as well as in clearings, thickets and along roadsides and ditches. It can also be found in urban areas where it is occasionally encountered as a weed species. 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「Symphyotrichum cordifolium」の詳細全文を読む スポンサード リンク
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