Annual; stems slender, glaucous, simple or sparingly branched, 2-6 dm; lvs alternate, erect or ascending, linear, 5-12 mm; racemes dense, 1-4 cm × 10-15 mm; fls pale rose-purple, 7-10 mm, the cor more than twice as long as the wings, promptly deciduous after anthesis; seeds hairy, 2 mm, with a cellular aril 1 mm. Dry soil, upland woods, barrens, and prairies; L.I. to Mich., Wis., Io., and Kan., s. to Fla. and Tex. June-Aug. (Galypola i.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.