Herbs, climbing. Root robust. Stem and branches distinctly angular-sulcate, at first pubescent, glabrescent. Petiole slender, 2-6 cm, pubescent and sparsely setose; leaf blade ovate-cordate, 4-11 × 3-7 cm, membranous, abaxially glaucous and setose, adaxially pale yellow pubescent, base cordate, margin dentate, apex acuminate; sinus 1-2 cm deep, 1-2.5 cm wide. Male panicle much branched, with many flowers; peduncle 7-16 cm, usually with a leaflike bract at base of branches; bract ovate, 1-2 cm; pedicels filiform, 1-2 cm, puberulent; calyx pubescent; tube campanulate; segments triangular-lanceolate, ca. 5 × 1.5-2 mm, 1-veined, apex shortly acuminate; corolla segments ovate, 12-15 × ca. 6 mm, 5-veined, apex acute; filaments ca. 2.5 mm; anthers narrowly ovoid, ca. 2.5 mm; rudimentary ovary semiglobose, ca. 1.5 mm in diam. Female flowers larger than male flowers, solitary or binary, sometimes 3 at apex of 15-25 mm peduncle; pedicels 4-6 cm; calyx segments lanceolate, ca. 6 × 1.5 mm, sparsely puberulent, 1-veined; corolla segments ovate, 30-35 × ca. 13 mm, puberulent, 5-veined, apex acuminate; ovary ellipsoid, 10-13 × 6-7 mm, densely yellow hispidulous, base subrounded, apex truncate; style ca. 4 mm, 3-fid; stigma reniform, 2-2.5 mm wide, 2-lobed. Fruiting peduncle 3-4 cm, puberulent; fruit 3-4 × 2-2.5 cm. Seeds gray-black, broadly ovate, ca. 5.5 × 4 mm, smooth. Fl. and fr. May-Oct.
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