Freely branched annual 3-7 dm; petioles 1-3 cm; lvs ovate or lance-ovate, 5-10 cm, acuminate; infls developed from most upper axils and often accompanied by floriferous branches; bracts oblong to obovate, 6-10 mm, cuspidate; cal-lobes 3 mm; cor pink or purple, 12-15 mm, or much smaller and cleistogamous, the lips about as long as the tube; 2n=ca 80. Moist or wet woods; s. Ind. to s. Mo., s. to Fla. and Tex., and n. along the coast to se. Va. (Diapedium b.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Common at the base of a wooded slope and the adjoining alluvial bottoms along Little Pigeon Creek on the farm of Nathan Taylor about a half mile west of Yankeetown in Warrick County. This is the only known station in Indiana.