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''Cirsium pulcherrimum'', called Wyoming thistle , is a North American species of plants in the thistle tribe within the sunflower family. The species is native to the western United States, primarily in the State of Wyoming but also in surrounding areas (Montana, Colorado, eastern Idaho, western Nebraska, northeastern Utah, and the Black Hills of South Dakota).〔(Biota of North America Program 2014 county distribution map )〕 ''Cirsium pulcherrimum'' is a perennial herb up to 90 cm (36 inches or 3 feet) tall, with a large taproot, blooming more than once (unlike many of its relatives, which die after blooming). Leaves are up to 25 cm (10 inches) long with thin spines along the edges of the leaves. There are a few flower heads, each head with pink, purple or cream-colored disc florets but no ray florets.〔(Flora of North America, Nuttall’s thistle, ''Cirsium nuttallii'' de Candolle )〕 ;Varieties〔〔 *''Cirsium pulcherrimum'' var. ''aridum'' (Dorn) D.J.Keil - Carbon, Fremont, + Sweetwater Counties in Wyoming *''Cirsium pulcherrimum'' var. ''pulcherrimum'' - most of species range ==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「Cirsium pulcherrimum」の詳細全文を読む スポンサード リンク
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