Much like no. 1 [Dioscorea villosa L.], differing as indicated in the key; frs and seeds avg larger, the valves half-obovate; 2n=36, 54. Moist open woods, thickets, and roadsides; Pa. to Ind. and Mo., s. to Fla. and La., chiefly in the Appalachian region. May. Plants with the lvs glaucous beneath have been called var. glauca (Muhl. ex Bartlett) Fernald. (D. g.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.