Plants annual. Stem 2-3 m. Branches slender, subglabrous or slightly puberulent. Tendrils filiform, glabrous. Petiole slender, 4-13 cm, sometimes puberulent; leaf blade ovate or broadly ovate-cordate, 6-10 × 5-9 cm, membranous, puberulent, palmately 5-7-veined, 3-7-angular or-lobed, margin irregularly dentate, apex acuminate; sinus semicircular. Flowers very small, bisexual, solitary or in 3-5-flowered racemes; peduncle filiform, 1-1.5 cm, puberulent; calyx segments lanceolate, ca. 1.5 mm, 1-veined, entire; corolla rotate; segments white, ca. 2 × 0.8-1 mm, 3-veined; stamens inserted at base of calyx tube, free, ca. 1 mm, glabrous; filaments linear; anthers ca. 0.5 mm; anther cells erect, connective not produced; ovary ovoid, 3-locular; style short; stigmas 3. Fruit broadly ovoid, 10-15 mm, apex acute, 3-valved, 1-3-seeded. Seeds ovate, ca. 9 × 5.5 mm, compressed, margin irregularly dentate, apex truncate. Fl. and fl. Jun-Nov.
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A herb. The stems are 2-3 m long. The fruit are broadly oval and 1-1.5 cm long.
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