Stems and branches slender, sulcate-angular, puberulent at first or glabrescent. Tendrils slender. Petiole slender, 1-2(-3) cm, subglabrous; leaf blade ovate-hastate or ovate-triangular, 2.5-5 × 2-3.5 cm, membranous, usually 5-lobed, lobe margin dentate, both surfaces puberulent, apex shortly acuminate; sinus suborbicular, 6-8 mm deep. Plants dioecious. Male flowers in a raceme; peduncle pale yellow-green, 2.5-7 cm; pedicels ca. 3 mm; calyx tube cupular; segments linear, ca. 1.2 mm; corolla campanulate; segments narrowly ovate, ca. 2 mm; filaments nearly free, ca. 0.4 mm; anthers connate, one 1-celled, other 2-celled, ca. 0.4 mm. Female flowers solitary in leaf axil; pedicels filiform, 5-10 mm, glabrous; calyx segments subulate, 1.2-1.5 mm, apex acuminate; corolla yellow; segments narrowly ovate, ca. 2 × 1 mm, apex acuminate; staminodes glandular; ovary conical, ca. 3 mm, puberulent, base rounded, apex elongate; style filiform. Fruiting pedicel slender, ca. 1 cm; fruit ca. 1.5 × 0.5 cm, glabrous, base rounded, apex rostrate. Fl. and fr. Jul-Oct.
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