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''Eutrochium maculatum'' (spotted Joe-Pye weed) is a North American species of flowering plants in the sunflower family. It is widespread through much of the United States and Canada.〔(''Eutrochium maculatum'' ), Natural Resources Canada〕 It is the only species of the genus found west of the Great Plains.〔(Biota of North America Program 2014 county distribution map )〕 ''Eutrochium maculatum'' is an herbaceous perennial sometimes growing as high as . Stems are sometimes completely purple, sometimes green with purple spots. One plant can produce numerous rose-purple flower heads in late summer, each head with 8-22 disc flowers but no ray flowers. The binomial name ''maculatum'', meaning spotted, refers to the purple spots on the stem.〔Dickinson, T.; Metsger, D.; Bull, J.; & Dickinson, R. (2004) ROM Field Guide to Wildflowers of Ontario. Toronto:Royal Ontario Museum, p. 164.〕〔(Biota of North America Program 2014 county distribution map )〕 Spotted Joe-Pye weed thrives in marshes, rich fens and swamps. It also does well in man-made moist expanses such as ditches, seepage areas and wet fields. Above all else the plant flourishes in the non-shaded environments that are so abundant in wetlands.〔(Flora of North America, ''Eutrochium maculatum'' (Linnaeus) E. E. Lamont, 2004. Spotted joepyeweed, eupatoire maculée )〕 ;Varieties〔〔 *''Eutrochium maculatum'' var. ''bruneri'' (A. Gray) E. E. Lamont - western Canada (British Columbia to Saskatchewan), western USA (Minnesota west to Idaho, south to Arizona + New Mexico) *''Eutrochium maculatum'' var. ''foliosum'' (Fernald) E. E. Lamont - eastern Canada (Newfoundland to Ontario), northern USA (Maine to Minnesota) *''Eutrochium maculatum'' var. ''maculatum'' - eastern Canada (Newfoundland to Ontario), eastern USA (Maine to Minnesota, south to northern Georgia) ==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「Eutrochium maculatum」の詳細全文を読む スポンサード リンク
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