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''Eupatorium album'', or white thoroughwort, is a herbaceous perennial plant in the sunflower family native from the eastern and southern states of the USA, from eastern Texas to Connecticut, inland as far as Indiana.〔(【引用サイトリンク】 work = Flora of North America )〕〔(Biota of North America Program 2014 county distribution map )〕 As with other members of the genus ''Eupatorium'', ''Eupatorium album'' flowers with large numbers of small white heads. The flower heads have 4-5 disc florets each, but no ray florets.〔(【引用サイトリンク】 Eupatorium )〕 The plant grows 50–100 cm (20-40 inches) tall,〔 making it one of the shorter ''Eupatorium'' species.〔 ''Eupatorium album''is capable of hybridizing with other ''Eupatorium'' species including ''Eupatorium sessilifolium'' and ''Eupatorium serotinum''.〔 Its appearance is similar to ''Eupatorium altissimum'', but differs in that the bracts (located at the base of the flower head) taper to a long point.〔 ''Eupatorium album'' grows in dry, open areas such as power lines, old fields, and eroded slopes. It will not grow under a shady canopy, but can be found in some open woods such as pine barrens. ;Varieties〔 *''Eupatorium album'' var. ''album'' - most of species range *''Eupatorium album'' var. ''subvenosum'' A. Gray - Delaware, District of Columbia, New Jersey, New York *''Eupatorium album'' var. ''vaseyi'' (Porter) Cronquist - from Alabama to Pennsylvania ==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「Eupatorium album」の詳細全文を読む スポンサード リンク
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