Cirsium amblylepis Petr. accepted as Cirsium remotifolium var. odontolepis Petr. (original description)
Cirsium amplifolium (Greene) Petr. (original description)
Cirsium blumeri Petr. accepted as Cirsium wheeleri (A.Gray) Petr. (original description)
Cirsium botrys Petr. accepted as Cirsium cymosum var. cymosum (original description)
Cirsium breweri subsp. howellii (Petr.) Petr. accepted as Cirsium ciliolatum (L.F.Hend.) J.T.Howell (original description)
Cirsium breweri subsp. wrangelii Petr. accepted as Cirsium douglasii DC. (original description)
Cirsium butleri (Rydb.) Petr. accepted as Cirsium scariosum var. scariosum Nutt. (original description)
Cirsium californicum var. bernardinum (Greene) Petr. accepted as Cirsium occidentale var. californicum (A.Gray) D.J.Keil & C.E.Turner (original description)
Cirsium canovirens (Rydb.) Petr. accepted as Cirsium cymosum var. canovirens (Rydb.) D.J.Keil (original description)
Cirsium clavatum (M.E.Jones) Petr. (original description)
Cirsium drummondii subsp. lanatum Petr. accepted as Cirsium scariosum (Poir.) Nutt. (original description)
Cirsium drummondii subsp. latisquamum Petr. accepted as Cirsium scariosum var. citrinum (Petr.) D.J.Keil (original description)
Cirsium drummondii subsp. vexans Petr. accepted as Cirsium scariosum var. americanum (A.Gray) D.J.Keil (original description)
Cirsium drummondii var. vexans Piper accepted as Cirsium scariosum (Poir.) Nutt. (original description)
Cirsium flaccidum (Small) Petr. accepted as Cirsium carolinianum (Walter) Fernald & B.G.Schub. (original description)
Cirsium floccosum (Rydb.) Petr. accepted as Cirsium tracyi (Rydb.) Petr. (original description)
Cirsium horridulum subsp. megacephalum Petr. accepted as Cirsium horridulum Michx. (original description)
Cirsium howellii Petr. accepted as Cirsium ciliolatum (L.F.Hend.) J.T.Howell (original description)
Cirsium kelseyi (Rydb.) Petr. accepted as Cirsium scariosum var. coloradense (Rydb.) D.J.Keil (original description)
Cirsium lacerum (Rydb.) Petr. accepted as Cirsium scariosum var. scariosum Nutt. (original description)
Cirsium laterifolium (Osterh.) Petr. accepted as Cirsium scariosum var. americanum (A.Gray) D.J.Keil (original description)
Cirsium loncholepis Petr. accepted as Cirsium scariosum var. citrinum (Petr.) D.J.Keil (original description)
Cirsium magnificum (A.Nelson) Petr. accepted as Cirsium scariosum var. scariosum Nutt. (original description)
Cirsium mendocinum Petr. (original description)
Cirsium mohavense subsp. utahense (Petr.) Petr. accepted as Cirsium neomexicanum A.Gray (original description)
Cirsium montigenum Petr. accepted as Cirsium hydrophilum var. vaseyi (A.Gray) J.T.Howell (original description)
Cirsium nelsonii (Pammel) Petr. accepted as Cirsium canescens Nutt. (original description)
Cirsium neomexicanum subsp. bakeri Petr. accepted as Cirsium neomexicanum A.Gray (original description)
Cirsium nevadense (Greene) Petr. accepted as Cirsium neomexicanum A.Gray (original description)
Cirsium nidulum (M.E.Jones) Petr. accepted as Cirsium arizonicum var. arizonicum (A.Gray) Petr. (original description)
Cirsium novo-mexicanum Petr. (original description)
Cirsium occidentale subsp. eu-occidentale Petr. accepted as Cirsium occidentale (Nutt.) Jeps. (original description)
Cirsium occidentale subsp. venustum (Greene) Petr. accepted as Cirsium occidentale var. venustum (Greene) Jeps. (original description)
Cirsium olivescens (Rydb.) Petr. accepted as Cirsium scariosum var. coloradense (Rydb.) D.J.Keil (original description)
Cirsium osterhoutii (Rydb.) Petr. accepted as Cirsium clavatum var. osterhoutii (Rydb.) D.J.Keil (original description)
Cirsium parryi subsp. viridiflorum Petr. (original description)
Cirsium perplexans (Rydb.) Petr. (original description)
Cirsium polyphyllum (Rydb.) Petr. accepted as Cirsium eatonii var. murdockii S.L.Welsh (original description)
Cirsium pulchellum subsp. bipinnatum (Eastw.) Petr. accepted as Cirsium calcareum (M.E.Jones) Wooton & Standl. (original description)
Cirsium pulchellum subsp. diffusum (Eastw.) Petr. accepted as Cirsium calcareum (M.E.Jones) Wooton & Standl. (original description)
Cirsium pulchellum var. glabrescens Petr. accepted as Cirsium calcareum (M.E.Jones) Wooton & Standl. (original description)
Cirsium quercetorum var. campylolepis Petr. accepted as Cirsium quercetorum (A.Gray) Jeps. (original description)
Cirsium quercetorum var. citrinum Petr. accepted as Cirsium scariosum var. citrinum (Petr.) D.J.Keil (original description)
Cirsium quercetorum var. mendocinum Petr. (original description)
Cirsium quercetorum var. xerolepis Petr. accepted as Cirsium quercetorum (A.Gray) Jeps. (original description)
Cirsium revolutum (Small) Petr. accepted as Cirsium virginianum (L.) Michx. (original description)
Cirsium rusbyi (Greene) Petr. accepted as Cirsium mohavense (Greene) Petr. (original description)
Cirsium rydbergii Petr. (original description)
Cirsium scapanolepis Petr. accepted as Cirsium scariosum var. americanum (A.Gray) D.J.Keil (original description)
Cirsium tioganum (Congdon) Petr. accepted as Cirsium scariosum var. americanum (A.Gray) D.J.Keil (original description)
Cirsium tracyi (Rydb.) Petr. (original description)
Cirsium triacanthum Petr. accepted as Cirsium cymosum var. cymosum (original description)
Cirsium tweedyi (Rydb.) Petr. accepted as Cirsium eatonii var. murdockii S.L.Welsh (original description)
Cirsium undulatum subsp. helleri (Small) Petr. accepted as Cirsium texanum Buckley (original description)
Cirsium vaseyi var. hydrophilum (Greene) Petr. accepted as Cirsium hydrophilum (Greene) Jeps. (original description)
Cirsium walkerianum Petr. accepted as Cirsium quercetorum (A.Gray) Jeps. (original description)