493 species are accepted. •
Cirsium rhothophilum – surf thistle •
Cirsium rivulare – brook thistle •
Cirsium rydbergii – Rydberg's thistle •
Cirsium scapanolepis – mountain slope thistle •
Cirsium scariosum – meadow thistle •
Cirsium scopulorum – mountain thistle •
Cirsium setidens – gondre or Korean thistle •
Cirsium spinosissimum •
Cirsium texanum – Texas thistle •
Cirsium tioganum – stemless thistle • †
Cirsium toyoshimae •
Cirsium tuberosum – tuberous thistle •
Cirsium turneri – cliff thistle •
Cirsium undulatum – gray thistle, wavy-leaf thistle, wavyleaf thistle •
Cirsium undulatum var.
tracyi – Tracy's thistle, wavyleaf thistle •
Cirsium undulatum var.
undulatum – wavyleaf thistle •
Cirsium vinaceum – Sacramento Mountain thistle, Sacramento Mountains thistle •
Cirsium virginianum – Virginia thistle •
Cirsium vulgare – spear thistle, common thistle (
syn. Cirsium lanceolatum ) •
Cirsium wheeleri – Wheeler's thistle •
Cirsium wrightii – Wright's thistle ;Hybrids •
Cirsium × canalense – canal thistle •
Cirsium × crassum – thistle •
Cirsium × erosum – glory thistle •
Cirsium × iowense – Iowa thistle •
Cirsium × vancouverense – Vancouver thistle
Formerly placed here •
Afrocirsium buchwaldii (as
Cirsium buchwaldii ) •
Afrocirsium schimperi (as
Cirsium schimperi ) •
Afrocirsium straminispinum (
Cirsium straminispinum ) •
Lophiolepis eriophora (as
Cirsium eriophorum ) – woolly thistle •
Nuriaea dender (as
Cirsium dender ) •
Nuriaea engleriana (as
Cirsium englerianum ) •
Picnomon acarna (as
Cirsium acarna ) – soldier thistle ==Image gallery==