Plants dioecious. Tuber brown outside, white inside, depressed globose, 3-5 cm in diam. Cataphylls 3, ca. 50 × 25 cm, membranous. Leaf solitary; petiole green, often slightly purplish, terete, 30-50 cm, proximal 1/4-1/3 sheathing into pseudostem, ca. 1 cm in diam.; leaf blade 3-foliolate; leaflets pale green abaxially, deep green adaxially, shortly petiolulate or subsessile; terminal elliptic or oblong, 16-30 × 9-16 cm, base auriculate and rounded, inner base narrowly cuneate, apex acuminate; lateral veins very numerous and running almost parallel, distinctly raised abaxially, impressed adaxially. Peduncle emerging from pseudostem, shorter than petioles, 25-45 cm. Spathe dark purple, with white longitudinal lines; tube cylindric, 4-8 cm, slightly costate inside, but in Xizang specimens almost smooth inside, throat margins slightly recurved; limb incurved, narrowly ovate-oblong, 3-4 cm, apex acuminate with a filiform tail. Spadix unisexual; female zone 2.4-3.5 cm; ovary green; style short; stigma white, disciform; appendix pendulous from spathe, dark purple, very long flagelliform, 20-50 cm, inflated toward base, base truncate, swollen disciform, with a stipe 3-5 mm, smooth throughout; male zone 2-3.7 cm; synandria of 3-5 stamens; connected filaments distinct; thecae dehiscing by a horseshoe-shaped slit. Fl. Jul.
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