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Cirsium altissimum : ウィキペディア英語版 | Cirsium altissimum
''Cirsium altissimum'' is a North American species of plants in the thistle tribe within the sunflower family. Common name is Tall thistle or roadside thistle. The species is native to the eastern and Central United States, with a range extending from Massachusetts west to North Dakota and south to Texas and the Florida Panhandle.〔(Biota of North America Program 2014 county distribution map )〕 ''Cirsium altissimum'' is, as the name implies, a tall herb, sometimes reaching as much as 400 cm (160 inches or 13 1/3 feet). It is a biennial or perennial, blooming only once before dying. Leaves are toothed or shallowly lobed, with fine spines along the edge. Sometimes there is only one flower head but more often more, with pink or purple (rarely white) disc florets but no ray florets. The species grows in prairies, open woodlands, and disturbed sites.〔(Flora of North America, Tall or roadside thistle, ''Cirsium altissimum'' (Linnaeus) Sprengel )〕 ==References==
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