Annual; stems 1-3 dm, glandular-pubescent; lvs lanceolate to oblanceolate, 2-5(-6) cm, narrowed from near or above the middle to the base; pedicels very slender, widely divergent, 1-2 ( + ) cm; bractlets equaling or surpassing the cal; sep lanceolate, 4-6 mm; cor 8-10 mm, the lobes white, the tube yellowish; fr 3-5 mm; 2n=16. Wet soil; Que. to B.C., s. to Ga. and Ariz.; our most abundant sp. May-July, also again in autumn, and often then with cleistogamous fls. (G. virginica, misapplied)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.