Herbs, climbing. Stems and branches sparsely puberulent, ultimately glabrous, smooth, angular-sulcate. Petiole slender, 3.5-5.5 cm, glabrous; leaf blade ovate-cordate, 6-8(-14) × 4-6(-10) cm, membranous or papery, abaxially densely pale yellow pubescent, adaxially setose, basal lateral veins along blade base, base cordate, margin serrulate, apex acuminate; sinus open, semicircular, 1-1.5 cm deep, 1-2 cm wide. Tendrils filiform, glabrous, 2-fid. Male flowers numerous in a ca. 17 cm panicle; peduncle robust, sparsely pubescent, usually with a bract at base of branches; bract 2-2.5 × 1.5-2 cm; pedicel 1-1.5 cm; calyx tube campanulate; segments triangular-lanceolate, 5-6 × ca. 2.5 mm, 3-veined, apex acuminate; corolla segments oblong, 18-20 × 6-8 mm, glabrous, 5-veined, apex acuminate; filaments ca. 4 mm, puberulent; anthers elliptic, ca. 3 mm. Female flowers solitary, or 3-5 on a 3-4 cm peduncle; pedicel slender, 3-5 cm, sparsely puberulent; calyx tube campanulate; segments ca. 7.5 mm, ca. 2.5 mm wide at base, glabrous, 3-veined, apex acuminate; corolla segments 4-4.5 × 1.8-2 cm; ovary oblong, 10-12 × 6-7 mm, densely yellow-brown setose; style 3-fid; stigma enlarged, reniform, 2-2.5 mm, 2-lobed. Fruiting peduncle robust, 3-6 cm, glabrescent; fruit black-brown, oblong, 3-3.5 × 2-2.5 cm, scabrous, yellow-brown setose, apex and base obtuse. Seeds yellow-brown when dry, narrowly ovate, 6-7 × 3-3.5 mm, ca. 1.5 mm thick, smooth, base subrounded, apex obtuse. Fl. and fr. Jun-Oct.
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