Stout biennial, 3-8 dm, commonly with many opposite branches at and beyond the middle, sharply wing-angled; lvs ovate or lance-ovate, 1-4 cm, broadly rounded or subcordate at base, 3-7-nerved; pedicels 5-30 mm, the conspicuous wings continuing upon the base of the cal; cal-lobes narrowly oblong to oblanceolate, 6-15 mm, usually at least 1.5 mm wide; cor pink (white) with a greenish center, the lobes 1-2 cm, oblanceolate to obovate; 2n=38. In a wide range of habitats, sometimes weedy; Conn. to s. Mich. and Kans., s. to Fla. and Tex. July, Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.