Plants slender. Stems and branches glabrous. Tendrils filiform, glabrous, simple. Petiole slender, 3-4 cm, sparsely white hirsute; leaf blade ovate or triangular, 6-7 × 6-7 cm, membranous, abaxially more scabrous, white punctate, adaxially sparsely hirsute on veins, base truncate or with ca. 5 mm deep sinus, margin sparsely dentate, apex acute. Plants dioecious. Male flowers usually 7-10 in a raceme, or solitary; rachis filiform, 1-2 cm, puberulent; pedicels slender, 0.5-1 cm; calyx tube campanulate, 1-2 × ca. 2 mm, glabrous; segments subulate, ca. 0.5 mm; corolla yellow-white; segments explanate, ovate or oblong, apex acute or slightly obtuse; stamens 3, two 2-celled, one 1-celled, inserted on base of calyx tube; filaments short; anthers oblong, 1-1.2 mm, glabrous; anther cells erect; connective narrow, not produced. Female flowers solitary; pedicels slender, 1-1.5 cm, puberulent; ovary fusiform, ca. 1 × 0.2 cm, subglabrous, both ends attenuate. Fruiting pedicel 1-2 cm, sparsely hirsute; fruit fusiform, 3-4 × 1-1.5 cm, both ends attenuate. Seeds gray-white, oblong or ovate, compressed, 5-7 × 3-4 mm, smooth, marginate. Fl. Jun-Aug, fr. Aug-Nov.
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