Anemone quinquefolia L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Delicate herb mostly 1–2 dm from a slender rhizome; basal lf solitary, long-petioled; lfls 3–5, rhombic to cuneate-obovate, coarsely and unevenly toothed or incised, chiefly above the middle; involucral lvs similar but smaller, the lateral lfls commonly incised on the outer margin, the middle one 2–5 cm, broadest distinctly above the middle, cuneate and entire from the middle to the base; sep mostly 5, white, or reddish beneath, 10–22 mm; achenes fusiform, 3–4.5 mm, short-hirsute; 2n=32. Moist woods; Que. to Man., s. to Md., O., n. Ind., and ne. Io., and in the mts. to n. Ga. Apr.–June. Eastern plants (w. to Ont. and O.) with the stem glabrous below the involucre, are var. quinquefolia. More western plants, with the stem spreading-villous below the involucre, are var. bifolia Farw. (var. interior)