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''Eutrochium fistulosum'' (''Eupatorium fistulosum''), also called hollow Joe-Pye weed,〔(【引用サイトリンク】title=USDA GRIN Taxonomy )〕 trumpetweed,〔 or purple thoroughwort,〔 is a North American flowering plant in the sunflower family. It is native to southern Canada and throughout the eastern and south central United States from Maine west to Ontario, Wisconsin, and Missouri and south as far as Florida and Texas.〔(Biota of North America Program 2014 county distribution map )〕 The species name ''fistulosum'' refers to the tubular stem; see fistula. ''Eutrochium fistulosum'' is a herbaceous perennial plant sometimes as much as tall. It is found in moist, rich soil alongside ditches and marshes, or in wet forests.〔 It flowers from mid-summer to the first frosts, makes an attractive backdrop in garden plots, and is very attractive to butterflies, bees, and other nectar-feeding insects.〔Tew, James (Some Ohio Nectar and Pollen Producing Plants ) Ohio State University Extension Factsheet〕 The plant has one simple erect stem, which is green with purple dots or longitudinal dashes. The upper stems are reddish or purplish. Leaves and primary subdivisions of the flower head appear in whorls of 3–5 (rarely 2 or 6, the rotational symmetry of most plants is consistent). Leaves are large, long and sharply toothed. One plant can produce several flower heads in a branching array, each head with 4-7 pink or purple disc flowers but no ray flowers.〔(Flora of North America, ''Eutrochium fistulosum'' (Barratt) E. E. Lamont, 2004. Trumpetweed, hollow joepyeweed )〕 File:JoePye-3fold.jpg|3-fold symmetry File:JoePye-4fold.jpg|4-fold symmetry File:JoePye-5fold.jpg|5-fold symmetry File:JoePyeWeedStem.jpg|Stem sections ==References== fr:Eupatorium fistulosum 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 fistulosum」の詳細全文を読む スポンサード リンク
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