Erect annual 2-7 dm, simple or seldom branched above; lvs deltoid-lanceolate or deltoid-ovate, broadly rounded or subcordate at the closely sessile base, 1.5-3 cm, 5-7-nerved; infl loose and open with long internodes, the cymes raised above the uppermost foliage lvs on a long peduncle; bracts subulate; sep lanceolate, acuminate, 3.5-5 mm; pet narrow, 3-3.5 mm; stamens 10-14; styles 3(4), under 1 mm; fr lanceolate or narrowly ovoid, 3-5 mm; seeds 0.5 mm, the longitudinal ridges barely visible at 10 2n=16. Moist or wet, usually sandy soil, chiefly on the coastal plain; s. N.J. to Fla. and Tex., and at scattered more inland stations to Pa., O., Ind., Ill., and Mo.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.