Stem herbaceous, glabrous. Petiole slender, 1.5-3.5 cm; leaf blade ovate-orbicular, 4-11 × 3-10 cm, palmately 5-partite; lateral lobes ovate-oblong, acute; central lobe oblong-lanceolate, acuminate; basal lobe with a gland at apex, glabrous or pilose on veins. Tendrils filiform, 2-fid. Inflorescence paniculate, 4-10 cm; pedicel filiform, 1.5-3.5 cm; calyx and corolla similar, yellow-green; segments ovate-lanceolate, ca. 2.5 cm; stamens free; filaments 0.3-0.5 mm; anthers ca. 0.5 mm; ovary ovoid, 3-locular; ovules 2 in each locule. Fruit cylindric, 1.5-3 × 1-1.2 cm, circumscissile-dehiscent, conical at apex. Seeds 6, 8-10 × ca. 5 mm, testa rugose, margin denticulate, with a long membranous wing at apex, wing 8-10 mm. Fl. Jun-Aug, fr. Aug-Sep.
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