Annual; lfls narrowly to broadly oblong or lanceolate, 3-5 cm, pilose on both sides, more densely so beneath, with stiff hairs 1-2 mm; fls 5-8 mm; cal and bracteoles hirsute, the bracteoles lanceolate, varying in length; fr 2-4 cm, spreading-hairy; seeds 2.5-3 mm, the pubescence easily detached; otherwise much like no. 1 [Strophostyles helvula (L.) Elliott]. Dry or moist sandy soil, upland woods, dunes and shores; O. to Wis. and N.D., s. to Ala. and Tex. (S. pauciflora)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.