Annual; stems pubescent, 1-2 m; lvs orbicular in outline, 5-12 cm, cordate at base with rounded basal lobes, usually deeply 3-lobed with rounded sinuses (occasionally
5-lobed or entire), the lobes acuminate; peduncles shorter than or equaling the petioles, with usually 1-3 fls; sep lanceolate, commonly 15-25 mm, narrowed from below the middle into a slender, linear, recurved tip, the basal part densely hirsute; cor purple or blue, varying to white, 3-5 cm; ovary 3-locular; stigma 3-lobed; 2n=30. Native of warm-temp. Amer., now established as a weed in waste places, along roads, and in cornfields throughout much of our range, especially southward. July-Sept. (Pharbitis h.) Plants with entire lvs, rare with us but abundant southward, have been called var. integriuscula A. Gray. (Pharbitis barbigera)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.