Plants dioecious. Tuber subglobose, 3-7 cm in diam., with many small tubercles. Leaf solitary, emerging after anthesis; petiole ca. 30 cm, basal part forming pseudostem; leaf blade 3-foliolate; leaflets with petiolules 1-1.5 cm; central leaflet rhombic, ca. 24 × 14 cm; lateral leaflets oblique, outer side often ca. 2 × as wide as inner side, ca. 20 × 13 cm, base cuneate at inner side, rounded at outer side. Peduncle shorter than petioles, ca. 25 cm × 5 mm. Spathe purple with white lines; tube funnelform, ca. 8 × 2.5 cm, without lamella inside; limb incurved, galeate, lateral margins elongated into broad wings, with whitish reticulate networks on both sides, ca. 20 × 20 cm, base constricted, apex rounded with an acumen 3-4 cm. Spadix unisexual; female zone conic, ca. 3 × 2 cm; ovary cylindric, ca. 5 mm; ovules 2, basal, erect, fusiform; style short; stigma disciform; male zone cylindric, ca. 3 cm × 9 mm; synandria of 2 or 3 stamens; anthers stipitate, dehiscing by horseshoe-shaped slit; appendix purple, flagellate, ca. 44 cm (female) to 143 cm (male) in total, proximal 13-14 cm subcylindric, ca. 1.5 cm in diam., base attenuate, not truncate, stipe ca. 1.8 cm × 8 mm (female), ca. 4 × 3 mm (male), distal filiform part ca. 30 cm (female) to 130 cm, pendulous. Berries red. Fl. Apr-Jun, fr. Jul.
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