Plants dioecious. Tuber depressed globose, 3-10 cm in diam., with small tubercles. Cataphylls to 9 cm, membranous. Leaf solitary; petiole green with dark purple spots, 20-40 cm, proximal 1/3 sheathing into pseudostem; leaf blade 3-foliolate; leaflets sessile or subsessile, green with reddish margin; veins raised, often reddish abaxially; central leaflet broadly rhombic or ovate-rhombic, sometimes broader than long, 7-15 × 6-11 cm, base broadly cuneate, apex acuminate; lateral leaflets obliquely ovate, 11-14 × 7-9 cm, base rounded to subtruncate, apex acuminate. Peduncle shorter than petioles, 20-22 cm. Spathe tube purplish brown with longitudinal whitish lines, cylindric, 4-5 × 1.5-2 cm, longitudinally lamellate inside, throat margins slightly recurved; limb strongly incurved, dark purple with white longitudinal and reticulate lines (at margin), obovate, 7-8 × 3-5 cm, apex acuminate. Spadix unisexual; female zone conic, 2.6-6 cm; ovary green, obovoid; stigma subsessile, dark purple; male zone 1.5-2 cm × ca. 4 mm; synandria of 2-5 stamens; connected filaments distinct, 0.5-1 mm; anther dehiscing by horseshoe-shaped slit. Appendix brown, flagelliform, 11-20 cm, thickened toward base 5-15 mm wide, base truncate and stipitate. Fl. May.

Tsuga forest margins, thickets; 2800-3100 m. Xizang, Yunnan [Bhutan, N India, Kashmir, Myanmar, Nepal, Pakistan].