Taprooted annual; stems diffuse or decumbent, 2-6 dm, sparsely hirsute; lvs broadly ovate, 2-4 cm, broadly obtuse or rounded at the summit, coarsely serrate, truncate or subcordate at base; petioles of the main lvs a third to half as long as the blade; cal-lobes nearly as long as the tube; cor anthocyanic to white, 6-8 mm, scarcely exceeding the cal; 2n=10, 20. Native of Europe, now an occasional weed from Me. to Va. and casually inland. July-Oct.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.