Stem soon decumbent; lfls oblong-obovate to obovate, 3-6 cm; fls in the lower axils; standard orbicular, 12-16 mm; pedicel elongating and curved down after anthesis, pushing the fr into the soil; 2n=40. Native of S. Amer., cult. in se. U.S. and occasionally escaped along our s. border. Summer.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.