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''Cirsium horridulum'', called bristly thistle, horrid thistle, yellow thistle or bull thistle, is a North American species of plants in the thistle tribe within the sunflower family. The species is native to the eastern and southern United States from New England to Florida, Texas, and Oklahoma as well as to Mexico, Belize, Guatemala, Honduras, and the Bahamas.〔(Biota of North America Program 2014 county distribution map )〕〔Davidse, G., M. Sousa-Peña, S. Knapp & F. Chiang Cabrera. 2015. Asteraceae. 5(2): ined. In G. Davidse, M. Sousa Sánchez, S. Knapp & F. Chiang Cabrera (eds.) Flora Mesoamericana Universidad Nacional Autónoma de México, México D.F..〕〔Carnevali, G., J. L. Tapia-Muñoz, R. Duno de Stefano & I. M. Ramírez Morillo. 2010. Flora Ilustrada de la Peninsula Yucatán: Listado Florístico 1–326〕〔Nelson, C. H. 2008. Cat. Pl. Vasc. Honduras 1–1576. Secretaria de Recursos Naturales y Ambiente, Tegucigalpa〕〔Nash, D. L. 1976. Tribe IX, Cynareae. En: Nash, D.L. & Williams, L.O. (eds), Flora of Guatemala - Part XII. Fieldiana, Bot. 24(12): 423–428, 590〕 Thomas Nuttall (1786-1859) described var. ''megacanthum'' as "one of the most terribly armed plants in the genus."〔Nuttall quoted in (Flora of North America, Bigspine thistle, ''Cirsium horridulum'' Michaux var. ''megacanthum'' (Nuttall) D. J. Keil )〕〔(Nuttall, Thomas 1841. Transactions of the American Philosophical Society, new series 7: 421 ) as ''Cirsium megacanthum''〕 ''Cirsium horridulum'' is a biennial or perennial herb up to 250 cm (100 inches) tall, with a large taproot and fleshy side roots that sometimes sprout new shoots. Leaves are up to 40 cm (16 inches) long with thick, sharp spines along the edges. There are usually several flower heads, also with sharp spines, each head with disc florets but no ray florets. Flower color varies from one plant to the next: white, yellow, pink, red or purple.〔 ;Varieties〔〔(Flora of North America, Bristly or horrid or yellow or bull thistle, ''Cirsium horridulum'' Michaux, Fl. Bor.-Amer. 2: 90. 1803. )〕 * ''Cirsium horridulum'' var. ''horridulum'' - from Maine to Guatemala * ''Cirsium horridulum'' var. ''megacanthum'' (Nutt.) D.J.Keil - from the Florida Panhandle to Texas and Oklahoma * ''Cirsium horridulum'' var. ''vittatum'' (Small) R.W.Long - from North Carolina to Louisiana ==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 horridulum」の詳細全文を読む スポンサード リンク
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