Monoecious vines; stems pubescent to glabrate. Leaves simple, cordate to ovate, entire or 3-lobate, 6-20 cm long and nearly as wide, the apex rounded to acute, the base cuneate to cordate, the margin remotely glandularly denticulate, chartaceous to subcoriaceous, 3-veined, the upper surface white pustulate, both the surfaces pubescent, at least on the veins near the base, the lower surface with sessile glands near the petiole; petiole 2-8 cm long, puberulent; tendrils 1-or 2-branched below the middle. Staminate flowers axillary, racemose or paniculate, occasionally solitary, the rachis to 20 cm long, slender, pubescent to glabrate; pedicels 1-5 mm long, stout; calyx campanulate, ca. 1 cm long, obscurely many nerved, pubescent, the lobes broadly rounded, 1-3 mm long; corolla 5-lobate to below the middle, the lobes ovate lanceolate to oblong, ca. 1.5 cm long, greenish white, the outer surface pubescent, the inner surface tomentose, obscurely nerved; filaments ca. 1 cm long, filiform, the anthers complicate, forming an irregular oblong head, ca. 7 mm long; nectaries pouchlike on hypanthium wall toward base, cuplike nectary disc present at base of hypanthium. Pistillate flowers disposed as in staminate flowers; calyx and corolla as in staminate flowers; style ca. 1.5 cm long, ovary ellipsoid, puberulent to glabrate, 4-6 mm long; nectaries as in the staminate flower, a cuplike nectary disc surrounding style at base; staminodia minute. Fruits purplish black, ellipsoid to subglobose, ca. 2 cm long, ca. 1.5 cm in diameter, the surface smooth, glabrous; seeds 6-15, obovate, ca. 6 mm long, ca. 4 mm wide, brown and white mottled, the testa smooth.
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