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Stems hollow, 2-6 dm, branched above; basal lvs long-petioled, the broadly cordate-rotund blade usually with a deep and narrow sinus; cauline lvs with progressively shorter petiole and wider sinus; fls bright yellow, 1.5-4 cm wide; stamens 50-120; anthers linear-oblong or lance- oblong, 2 mm; follicles 4-15, 10-15 mm; 2n=32. Wet woods and meadows, swamps, bogs, and shallow water; circumboreal, s. to Va., W.Va., Ind., Ill., and Io., and in the mts. to N.C. and Tenn. Apr.-June. Forms with the basal leaves somewhat flabellate, with a relatively broad and open sinus, do not appear to be taxonomically separable. (var. flabellifolia)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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