Plants slender. Stem and branches glabrous, angular-sulcate. Tendrils filiform. Petiole slender, 3-4 cm, glabrous; leaf blade ovate-cordate, 5-7 × 3-4 cm, membranous, palmately 5-7-lobed; median lobe triangular, apex long acuminate; lateral lobes acute, margin irregularly dentate, palmately 7-veined, both surfaces setose at first; sinus semicircular. Plants monoecious. Male and female flowers in same racemose inflorescence; peduncle slender, 2-4 cm, glabrous. Male flowers: pedicel filiform, 1-2 mm; calyx tube broadly campanulate; segments subulate, ca. 1.5 mm; corolla segments ovate, ca. 5 mm, 1-veined; filaments connate, ca. 0.3 mm; anthers free, ca. 0.4 mm; anther cells erect. Female flowers: pedicel ca. 2 mm; calyx segments ovate, ca. 0.8 mm; ovary ovoid, ca. 0.8 mm, glabrous; style 3-fid; stigma expanded. Fruiting pedicel ca. 1 cm, slender; fruit subglobose, 3-locular with 1 seed in each locule. Fl. and fr. May-Nov.

● Roadsides on mountain slopes. Sichuan (Emei Shan).