Vines; stems slender, glabrous. Leaves simple, the blade hastate, 5-9 cm long, 3-6 cm wide at base, the margins denticulate, the apex acuminate, the basal sinus acute, chartaceous, the upper surface minutely pustulate, the lower surface glabrous; petiole 1.5-2.0 cm long; tendrils simple. Staminate flowers produced from the petiole at the base of the leaf blade, short racemose, 6-10-flowered; peduncle 1.5-2.0 cm long, slender; pedicels 5-8 mm long, filiform; calyx shallowly cupulate, 3-5 mm wide, greenish-white, the lobes obsolete; corolla ca. 6 mm in diameter, white or cream, the lobes 2-3 mm long, broadly lanceolate or triangular, the outer surface glabrous, the inner surface slightly papillate, 3-nerved; androecial column ca. 1 mm long, head ca. 1 mm in diameter. Pistillate flowers solitary in same axils as staminate flowers; peduncle 6-10 mm long; calyx and corolla as in the staminate flowers, but slightly smaller; ovary obliquely ovoid, rostrate, ca. 4 mm long, short setose; stigma subglobose. Fruits greenish, obliquely ovoid, ca. 1.5 cm long, explosively dehiscent, seta ca. 1 mm long; seeds not seen.
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