Vines, climbing. Stems and branches slender, angular, glabrous or sparsely pubescent. Petiole 2-7 cm, glabrous or shortly pubescent; leaf blade ovate-lanceolate or narrowly ovate-triangular, 8-18 × 4-8 cm, membranous, abaxially subglabrous, adaxially white setose, basal lateral veins not along base of blade, base cordate, margin dentate, apex acute or shortly acuminate; sinus open, semicircular, 1.5-2 cm deep, 1.5-2.5 cm wide. Tendril filiform, simple, glabrous. Male flowers 3-9(-12) at apex of peduncle in a raceme; peduncle slender, 2-2.5 cm; pedicels 1-2 cm, sparsely pubescent, glabrescent; calyx tube shortly campanulate, ca. 0.6 cm wide at apex, pubescent on veins; segments triangular, 7-8 mm, 1-veined; corolla segments oblong or elliptic, 1.5-2 × 0.8-1 cm, 5-veined, apex slightly obtuse; stamens 4 connected in pairs at base and 1 free; filaments ca. 3 mm; anthers oblong, 2.5-3 mm. Female flowers solitary, or 2 or 3 flowers on short peduncle; pedicels 2-4 cm; calyx and corolla as in male flowers; staminodes 5, subulate, ca. 1.5 mm, 4 in pairs, 1 free; ovary ovoid, acuminate at both apex and base, base emarginate and with lobules, rugose; style 3-fid; stigma enlarged, reniform. Fruit broadly ovoid, ca. 4 cm, verrucose, base slightly emarginate. Seeds ovate, 6-8 × 3-4.5 mm, 1-1.5 mm thick, apex obtuse. Fl. Apr-Jul, fr. Aug-Oct.
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