Annual, climber or trailer. Tendril 2-fid. Stem densely hairy. Leaves palmate, broadly ovate, reniform or sub-orbicular, cordate, obscurely 3-5-lobed, lobes rounded, 3.0-23 x 4-23 cm; petiole 2.7-13 cm long with a pair of small apical lateral conical glands. Both male and female flowers solitary; male penduncle as long as petiole, female somewhat shorter. Corolla white, petals of male flower obovate, apiculate, 2.7-4.5 cm long, 1.8-3.7 cm broad. Staminal filaments 3-4 mm long; anthers oblong, coherent, included; thecae triplicate. Petals of female flowers c. 30 x 24 mm. Ovary ovoid, villous, 11-17 mm long, 6-8 mm across. Fruit large, subglobose, ellipsoid, lageniform, sometimes biventricose, green or greenish-yellow, hairy, indehiscent. Seeds white, oblong, compressed, slightly tapered, slightly 2-horned on the shoulders, 7-20 mm long.