Annual, 3-8 dm, ±pubescent; lvs oblanceolate, 6-15 cm, sharply serrate, gradually tapering to the short petiole; pedicels 1 or 2 in an axil, 1-2 cm, 1-fld; fls purple or rose, varying to white, the pet 2-2.5 cm, the saccate sep wider than long and shorter than the spur; fr villous; 2n=14. Native of s. Asia, widely naturalized in the tropics, and occasionally escaped from cult. in our range.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.