Ipomoea purpurea (L.) Roth
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Annual; stems pubescent, to 5 m; lvs round-cordate to ovate-cordate, entire (very rarely 3-lobed), abruptly short-acuminate or merely apiculate, glabrous to sparsely hairy; peduncles nearly or quite equaling the subtending petioles, 1–5-fld; sep lance-ovate to oblong, acute or acuminate, hirsute toward the base, commonly 10–15 mm; cor blue, purple, white, or variegated, 4–6 cm; ovary 3-locular; stigma 3-lobed; 2n=30. Native of trop. Amer., escaped from cult. and now a weed in fields, roadsides, and waste places in much of our range. July–Sept. (Pharbitis p.)