Slender woody vine, climbing high; stems glaucous at first, beset with numerous straight, stout prickles below, generally innocuous above; lvs evergreen, leathery, oblong or lanceolate to ovate, 6-10 cm, obtuse or subacute, entire, cuneate at base, 3-nerved, the outer nerves much nearer to the margin than to the midnerve; peduncles terete or angled, about equaling the subtending petioles; fr purple to black, mostly 1-seeded, ripening the second year; 2n=32. Wet woods and margins of swamps; N.J. to Fla. and Tex., and inland to e. Tenn. Aug., Sept.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.