Herbs, climbing, glabrous. Stem and branches angular-sulcate. Petiole slender, 8-10 cm; leaf blade ovate-cordate or broadly ovate-cordate, 10-16 × 8-12 cm, submembranous or thickly papery, adaxially scabrous, base cordate, margin dentate, apex acuminate; sinus suborbicular. Tendrils 2-fid. Male flowers 5-10 in raceme or panicle, sometimes 3 or 4 inflorescences in same leaf axil; rachis slender, 6-10 cm; pedicels filiform, 5-10 mm; calyx tube cupular; segments triangular-lanceolate, ca. 4 × 1 mm, 1-veined, apex obtuse; corolla segments narrowly ovate, 8-12 × ca. 5 mm, 5-veined, apex acuminate; stamens inserted on tube; filaments 4 connected in pairs and 1 free, 2-3 mm, sparsely pubescent; anthers oblong, ca. 2 mm; rudimentary ovary subglobose, ca. 2 mm in diam. Female flowers solitary, or 2 or 3 on a 1-2.5 cm peduncle; pedicels slender, 1-4 cm, glabrous; calyx and corolla as in male flowers; staminodes 2.5-3 mm, glandular, with 3 membranous scales; scales oblong, 3-4 mm, apex obtuse; ovary narrowly oblong, 10-15 × 3-4 mm, smooth, subglabrous, base truncate, apex attenuate; style slender, 5-6 mm, 3-fid; stigma suborbicular, 4.5-5 mm wide, 2-lobed. Fruiting peduncle smooth; fruit oblong, 4-6 × 3-4 cm, both ends obtuse-rounded. Seeds narrowly ovate, 4-5 × 2-3 mm, ca. 1.5 mm thick, base rounded. Fl. Aug-Oct, fr. Oct-Nov.
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