Herbs, climbing. Stem and branches angular-sulcate, at first puberulent and sparsely setose, glabrescent. Petiole slender, 4-7 cm, puberulent; leaf blade ovate-cordate or broadly ovate-cordate, 8-14 × 6-10 cm, membranous, abaxially puberulent, adaxially densely setose, base cordate, margin serrate, apex shortly acuminate; sinus 1-2 cm deep, 1.5-3 cm wide. Tendrils robust, elongate, 2-fid. Male panicle much branched, 5-13 cm, sparsely pubescent, usually with a leaflike bract at base of branch; bract ovate, 15-25 × 10-15 mm, apex acuminate or long acuminate. Male flowers: pedicel slender, 1-4 cm, pubescent; calyx tube campanulate; segments broadly lanceolate, 12-15 × 3-4 mm, distinctly 3-veined, apex acuminate, reflexed; corolla segments narrowly ovate, 20-22 × 8-9 mm, 5-veined, apex acuminate; filaments ca. 4 mm, puberulent; anthers ovoid, ca. 3 mm; rudimentary ovary semiglobose. Female flowers: 2-5 on a short peduncle; pedicels 3-6 cm; ovary densely setose and pubescent, oblong, ca. 1 cm. Fruiting peduncle robust, 3-6 cm, puberulent; fruit oblong, scabrous, yellow-brown pubescent and setose, apex and base obtuse. Fl. and fr. Jun-Oct.
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