Tuber oblate to conical. Stem and branchlets slender. Tendrils glabrous, 2-fid. Leaves pedately 5-7-foliolate; petiole 2-5 mm; leaflets lanceolate to elliptic-lanceolate, median leaflets 3-10 cm × 8-15 mm; petiolule 2-3 mm. Plants dioecious. Inflorescence dichotomous, to 30 cm; pedicels filiform, 2-5 mm. Male flowers: calyx segments ovate-lanceolate, 2-4 mm, glabrous, apex acute; corolla orange-yellow to pale yellow, bowl-shaped, 5-7 mm in diam.; segments ovate, revolute, 5-6 mm; filaments short, 0.5-1 mm. Female flowers: slightly larger than male flowers; ovary cylindric to conical, 4-5 × 2-2.5 mm. Fruit conical to cylindric, 2.4-3.5 cm × 8-10 mm, base attenuate, slightly curved; fruiting pedicel 4-7 mm. Seeds dark brown, narrowly elliptic, compressed, 10-12 × 4-6 mm, with corky wing; wing 3-4 mm at apex, ca. 1 mm wide on both sides; seed body broadly elliptic to ovate. Fl. Jul-Sep, fr. Aug-Oct.

● Forests, valleys, mountain slopes; 1600-2200 m. SW Sichuan, C and W Yunnan.