Cirsium undulatum (Nuttall) Sprengel. Wavy-leaf Thistle. Phen: May-Jun (-Oct). Hab: Dry prairies, pastures, disturbed areas. Dist: MB west to BC, south to sc. TX, NM, AZ, CA, and Mexico (CHH, COA, DGO, NLE, SON).
Origin/Endemic status: Native
Synonymy: = C, FNA19, GrPl, K3, K4, Mex, Mi, NcTx, Ok, Tx; = n/a – Pa; > Cirsium undulatum (Nutt.) Spreng. var. megacephalum (A.Gray) Fernald – F; > Cirsium undulatum (Nutt.) Spreng. var. undulatum – F
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