Cirsium muticum Michaux. Swamp Thistle. Phen: Aug-Nov. Hab: Swamps, wet thickets, woodlands, seepage slopes, wet prairies, meadows. Dist: NL (Newfoundland) west to SK, south to DE, NC, TN, and MO, and less commonly south to FL, AL (Diamond & Woods 2009), and TX.

Origin/Endemic status: Native

Synonymy: = Ar, C, Fl7, FNA19, G, GrPl, GW2, Il, K1, K3, K4, Mi, NE, NY, Oh3, Ok, Pa, S, SE1, Tat, Tn, Va, W, WH3; = Carduus muticus (Michx.) Pers. – RAB; > Cirsium muticum Michx. var. monticola Fernald – F; > Cirsium muticum Michx. var. muticum – F

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL
• Eastern Mountains and Piedmont: OBL
• Great Plains: FACW
• Midwest: OBL
• Northcentral & Northeast: OBL

Heliophily: 6