Stems erect or ascending, 3-6 dm; some basal lvs long-petioled, simple or nearly so, others smaller and pinnate; principal cauline lvs pinnate or some trifoliolate, with several toothed and often deeply cleft divisions, the upper and lower cauline lvs reduced; sep triangular, reflexed; bractlets none; pet yellow or white, 1-2 mm; head of achenes on a stipe 1-2 mm; achenes 2-3 mm, minutely appressed-puberulent; terminal segment of the style 0.7 mm, inserted on the very tip of the basal segment; 2n=42. Rich woods; s. Ont. to s. Wis., Io., and Kan., s. to Tenn. and nw. Okla.; also c. and s. N.Y., N.J., and Pa. Apr., May.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.