Ranunculus septentrionalis Poiret in Lamarck. Subgenus: Ranunculus. Section: Polyanthemos. Carolina Buttercup. Phen: Mar-Aug. Hab: Swamp forests, wet woodlands, open marshy wetlands. Dist: NY west to s. ON, WI, and MN, south to n. peninsular FL, LA, and e. TX.

Origin/Endemic status: Native

Taxonomy Comments: This species is tetraploid (n = 16).

Synonymy: = NY, Haines (2007b); = Ranunculus carolinianus DC. – F, G, GW2, Il, RAB, Va, W, WV, Keener (1976); = Ranunculus hispidus Michx. var. nitidus (Chapm.) T.Duncan – Ar, C, Fl2, FNA3, GrPl, K1, K3, K4, Mi, NcTx, Pa, Tn, WH3, Duncan (1980); > Ranunculus carolinianus DC. var. carolinianus – Tx; > Ranunculus carolinianus DC. var. villicaulis Shinners – Tx; > Ranunculus palmatus Elliott – S; > Ranunculus septentrionalis Poir. in Lam. – S

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