Plants dioecious. Tuber dark brown outside, whitish inside, globose, 5-7 cm in diam., bearing some tubercles around. Cataphylls 3 or 4, dark purple, with tiny greenish stripes, to 30 × 7 cm, apex obtuse. Leaf 1(or 2); petiole to 130 cm, basal part sheathing into short pseudostem; leaf blade 3-foliolate; leaflets sessile, dull abaxially, light green adaxially, margins usually cristate or crenulate; midrib and lateral veins raised abaxially; central leaflet depressed obovate, 15-26 × 18-28 cm, base cordate, apex nearly truncate with a broad and short acumen; lateral leaflets rhombic or obliquely ovate, longer than central one, to 37 × 24 cm, apex abruptly acuminate. Peduncle yellowish green, shorter than petioles, ca. 35 cm, papillose. Spathe purple with yellowish stripes; tube cylindric, 6-8 × ca. 3 cm, throat margins slightly recurved; limb oblong or obovate-oblong, 10-15 × 5-8 cm, apex abruptly acute with an acuminate tail 3-4 cm, incurved. Spadix unisexual; female zone conic, ca. 2 × 1.3 cm; ovary green, obconic; style distinct; stigma purple; male zone 5.5-6 cm × 6-7 mm; synandria stipitate, lax; anthers 3 or 4, reniform, dehiscing by horseshoe-shaped slit. Appendix robust, greenish dark purple, to 23 cm in total, proximally narrowly pyramidal, ca. 1.4 cm in diam., base truncate with a stipe ca. 10 × 7-8 mm, distally gradually narrowed into flagellum, tortuous, sometimes pendulous. Berries red, oblong, ca. 10 × 7 mm when mature. Fl. May, fr. Jun.
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