Tuber enlarged. Stem and branchlets stout, sparsely puberulent, ultimately glabrous; stem nodes thickened, densely pubescent. Leaves pedately 5-7-foliolate; petiole 5-8 cm; leaflets lanceolate to elliptic-lanceolate, margin serrate; median leaflets 5-11 × 2.5-4 cm; petiolule 2-5 mm. Plants dioecious. Inflorescence peduncle slightly reflexed, 5-11 cm. Male flowers: buds acute at apex; calyx segments lanceolate, ca. 6 × 3 mm; corolla pale yellow-green, rotate, 10-11 mm, fleshy; segments ± strap-shaped, base with 2 distinct glands. Female flower unknown. Fruit caplike, 4-5 × 3-3.6 cm. Seeds dark brown, broadly ovoid, 12-13 × 9-10 mm, 3-3.5 mm thick, almost unwinged. Fl. Jul-Oct, fr. Sep-Dec.

● Thickets on mountain slopes; 2400-2700 m. SW Yunnan.