Herbs, scandent. Stems sulcate-angular, 1-3 m, puberulent or glabrescent. Tendrils simple, pubescent. Petiole 3-7 cm, puberulent; leaf blade broadly ovate or orbicular in outline, 8-17 × 9-16 cm, papery, abaxially densely pubescent, adaxially densely punctate, palmately deeply 5-lobed; lobes oblong, margin irregularly dentate, apex acute or acuminate. Flowers unisexual. Male flowers: panicle short, many flowered; peduncle 2.5-3 cm, robust, puberulent; pedicels slender, filiform, 5-12 mm; calyx tube cupular, pubescent; segments 5, broadly lanceolate, 1.2-1.5 × ca. 0.5 cm, 3-veined, apex acuminate; corolla campanulate; segments 5, narrowly oblong or lanceolate-oblong, 1.5-1.8 × ca. 0.6 cm, 3-veined, apex acuminate; filaments ca. 2 mm; anthers ca. 3 mm, 1-celled. Female flowers solitary or paired; calyx and corolla as in male flowers; ovary narrowly oblong, 1.5-2 cm, villous; style columnar, apically 3-fid; stigmas dilated, 2-lobed. Fruit oblong, ca. 7.5 × 3.5 cm, smooth, base attenuate, apex rounded. Seeds numerous, horizontal, ca. 6 × 3 mm, smooth. Fl. Jun, fr. Sep.
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