Cirsium hillii (Canby) Fernald. Phen: Jun-Aug. Hab: Dry prairies, glades and barrens over calcareous substrates. Dist: ON, MI, WI, and MN south to wc. IN, c. IL, and ne. MO.
Origin/Endemic status: Native
Synonymy: = C, F, K3, K4, Mi, Oh3; = Cirsium pumilum (Nutt.) Spreng. var. hillii (Canby) Boivin – FNA19, Il