genusCirsium speciesCirsium horridulum Show Lower Taxa Cirsium horridulum var. horridulum, Cirsium horridulum var. megacanthum, Cirsium horridulum var. vittatum Michaux
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fontinale, Cirsium grahamii, Cirsium helenioides, Cirsium hookerianum, Cirsium horridulum, Cirsium hydrophilum, Cirsium inamoenum, Cirsium joannae, Cirsium kamtschaticum
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tribeAsteraceae tribe Cardueae genusCirsium speciesCirsium horridulum varietyCirsium horridulum var. megacanthum (Nuttall) D. J. Keil Sida 21: 214. 2004
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tribeAsteraceae tribe Cardueae genusCirsium speciesCirsium horridulum varietyCirsium horridulum var. horridulum David J. Keil Common names: Horrid thistle Endemic
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tribeAsteraceae tribe Cardueae genusCirsium speciesCirsium horridulum varietyCirsium horridulum var. vittatum (Small) R. W. Long Rhodora 72: 45. 1970. David
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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
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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
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originated as a derivative of ancient hybridization between the ancestors of C. horridulum and C. nuttallii. They further suggested a relationship between C. lecontei
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John Myers John Myers John Myers Cirsium douglasii var. breweri Cirsium horridulum var. megacanthum Cirsium remotifolium var. odontolepis John Myers John
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