Annual climber with unbranched glabrous tendrils, monoecious. Stem pubescent to glabrescent. Leaves orbicular, 1.5-5.0 (-12.0) cm long and as broad, cordate, glabrous or sparsely hairy, 3-5-lobed, middle lobes broadly ovate or rhombic-ovate, sinuate-dentate or acutely lobulate. Petiole 1-3(-4) cm long, pubescent. Flowers yellow, 2.5-3.0 cm across, pedicellate. Male flowers solitary, on 1.5(-7) cm long peduncle, bearing near the apex a sessile, broadly ovate-cordate, subglabrous, dentate bract; female flowers on 5-15 mm long basally bracteate or ebracteate peduncles. Calyx tube 5-6 mm long, pubescent, lobes ovate, acuminate, 3-3.5 mm broad. Corolla slightly zygomorphic, brown at base, lobes yellow, obovate, 10-15 mm long, 8-10(-12) mm broad. Ovary fusiform, beaked, puberulous, longitudinally tuberculate. Fruit broadly ovoid, narrowed at ends, 2-7 cm long, 1-2.5 cm broad, orange-red, tuberculate. Seeds elliptic-ovate, 1-1.2 cm long, 6-7 mm broad.