Oxypolis rigidior (Linnaeus) Rafinesque. Cowbane, Pig-potato. Phen: Aug-Oct; Oct-Nov. Hab: Bogs, seepages, swamps, wet meadows, streambanks. Dist: NY west to MN and south to n. FL and TX.

ID notes:Very variable in the size, shape, and toothing/lobing of the leaflets.

Origin/Endemic status: Native

Synonymy: = Ar, C, Fl7, G, GW2, K1, K3, K4, MC, Mi, Mo2, NcTx, NY, Ok, Pa, RAB, Tn, Tx, Va, W, WH3; > Oxypolis rigidior (L.) Raf. – S; > Oxypolis rigidior (L.) Raf. var. ambigua (Nutt.) Rob. – F, Il, WV; > Oxypolis rigidior (L.) Raf. var. rigidior – F, Il, WV; > Oxypolis turgida Small – S

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