Plants dioecious. Tuber depressed globose, 3-5 cm in diam. Cataphylls 3 or 4, pinkish brown, sparsely spotted with whitish dots, 5-24 × 4-5 cm, membranous, apex obtuse, convolute, encircling pseudostem. Leaf solitary; petiole entirely green, 15-35 cm, base forming pseudostem, ca. 1.2 cm in diam., smooth; leaf blade 3-foliolate, papery; leaflets sessile, ovate or nearly orbicular, apex rounded or acute; central leaflet 6-8 × 7-9 cm (at anthesis and much expanded later), base shortly cuneate; lateral leaflets slightly oblique, 5-6 × 4-8 cm. Inflorescence arising before leaves. Spathe pale green or white with green or purple longitudinal lines; tube cylindric, 3-4 × ca. 2 cm, throat margins recurved; limb ovate to ovate-lanceolate, 5-6 × 3-4 cm, apex with a tail 2-3 cm. Spadix unisexual; female zone oblong, ca. 2 × 1 cm; ovary green, obovoid; stigma subsessile, rounded; male zone cylindric, 1.6-2 cm × 3-4 mm; synandria consisting of 2 or 3 anthers; thecae yellow, subglobose, opening by apical pores. Appendix suberect or erect, white or pale green, funnel-shaped, subcylindric, 3-4.5 cm × 2-5 mm, naked, base attenuate, subsessile to stipitate, apex acute or obtuse.

● Quercus forests, valley thickets; 2200-3300 m. Sichuan, Xizang, Yunnan.