Annual to 6 dm, widely branched from near the base, villous or viscid-villous; lvs ovate, 3-10 cm; pedicels 5-10 at anthesis, 5-20 mm in fr; cor 6-10 mm, yellow with a dark center; cal-lobes narrow, 2-4 mm; anthers 1.5-2 mm; fruiting cal 2-4 cm, 5-angled; 2n=24. Moist soil; pantropical, n. to Mass., Ont., and Wis. May-Sept. Three vars. in our range.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.