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genusCirsium speciesCirsium horridulum Show Lower Taxa Cirsium horridulum var. horridulum, Cirsium horridulum var. megacanthum, Cirsium horridulum var. vittatum Michaux

tribeAsteraceae tribe Cardueae genusCirsium speciesCirsium horridulum varietyCirsium horridulum var. megacanthum (Nuttall) D. J. Keil Sida 21: 214. 2004

fontinale, Cirsium grahamii, Cirsium helenioides, Cirsium hookerianum, Cirsium horridulum, Cirsium hydrophilum, Cirsium inamoenum, Cirsium joannae, Cirsium kamtschaticum

tribeAsteraceae tribe Cardueae genusCirsium speciesCirsium horridulum varietyCirsium horridulum var. horridulum David J. Keil Common names: Horrid thistle Endemic

tribeAsteraceae tribe Cardueae genusCirsium speciesCirsium horridulum varietyCirsium horridulum var. vittatum (Small) R. W. Long Rhodora 72: 45. 1970. David

to Pennsylvania and Ohio. It is known to hybridize with Cirsium horridulum var. horridulum (R. J. Moore and C. Frankton 1966). None. None. window.proper

John Myers John Myers John Myers Cirsium douglasii var. breweri Cirsium horridulum var. megacanthum Cirsium remotifolium var. odontolepis John Myers John

pumilum var. pumilum and C. horridulum. They noted that an artificial hybrid (2n = 32) between C. repandum (2n = 30) and C. horridulum (2n = 34) had a mosaic

originated as a derivative of ancient hybridization between the ancestors of C. horridulum and C. nuttallii. They further suggested a relationship between C. lecontei

This is the category page for Cirsium horridulum. For the treatment page see Cirsium horridulum. Cirsium horridulum is a subcategory of Cirsium.