Vines, climbing, herbaceous, densely glandular-villous and sparsely multicellular-setose. Stem much branched; branches slender. Petiole slender, 3-6 cm; leaf blade adaxially dark green, ovate-cordate, broadly ovate-cordate, or suborbicular, 6-12 × 5-10 cm, membranous, abaxially pubescent, basal lateral veins along margin of blade base, base cordate, margin dentate, apex shortly acuminate; sinus rounded, 1-2 cm deep, 1-1.5 cm wide. Tendrils filiform, simple. Male flowers usually 2-7 in a raceme; peduncle 1-3 cm, usually bearing leaflike bract; bract 1-1.5 × ca. 1 cm, densely pubescent, margin dentate, apex acuminate; pedicel 1-2.5 cm; calyx tube broadly campanulate; segments yellow-green, narrowly lanceolate, 4-6 × ca. 1.5 mm, 3-veined; corolla segments ovate or narrowly ovate, 12-15 × 6-8 mm, 5-veined, apex obtuse; stamens 4 connected in pairs and 1 free; filaments filiform, 2-3 mm; anthers oblong, ca. 2 mm; rudimentary ovary semiglobose. Female flowers solitary; pedicels slightly robust; calyx segments narrowly lanceolate, 5-6 × ca. 1 mm, 3-veined, apex acuminate; corolla segments narrowly ovate, ca. 20 × 15 cm, 5-veined, apex acuminate; staminodes glandular; ovary narrowly oblong, 15-18 × 3-4 mm, densely pale yellow glandular villous; style stout, 3-fid; stigma enlarged, reniform, 2-lobed. Fruiting pedicel stout, 2-3 cm; fruit red-brown, oblong, to 7 × ca. 3.5 cm, both surfaces reticulate, base obtuse, apex attenuate. Fl. and fr. summer.
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