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Cirsium muticum : ウィキペディア英語版 | Cirsium muticum
''Cirsium muticum'' (also known as swamp thistle, marsh thistle, dunce-nettle, and horsetops) is a North American species of plants in the sunflower family, native to central and eastern Canada and the central and eastern United States. == Description== ''Cirsium muticum'' is a biennial plant that reaches a height of . Its taproot is fleshy and its stem is ridged with hairs toward the base.〔 The leaves are alternate in position, pinnately lobed, and ovate in shape. The leaf lobes are often asymmetrical and forked irregularly with the angles containing fine trichomes (multicellular hairs). The leaves become progressively smaller towards the inflorescence; there are often a few trichomes on the underside.〔 The peduncles are , each with an inflorescence made up of many tiny florets; the involucre has cobwebby white hairs, and it is often slightly sticky. The purple florets can be up to long.〔〔(Flora of North America, Swamp thistle, dunce-nettle, horsetops, chardon mutique, ''Cirsium muticum'' Michaux )〕
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