Plants perennial, dioecious. Tuber brown outside, subglobose, 1.5-5 cm in diam., bearing 5-10 tubercles 0.5-1 cm in diam. Cataphylls 2 or 3, greenish, oblong-elliptic, to 20 × 5 cm, membranous. Leaf solitary; petiole greenish, cylindric, 40-60 × 0.5-2.5 cm, densely verruculose with whitish spinules, sheathed in proximal 1/3 forming pseudostem; leaf blade 3-foliolate; leaflets sessile or subsessile, greenish abaxially, green adaxially with dark purple spots, margins purple; midrib and lateral veins raised abaxially, verruculose with whitish spinules; central leaflet depressed rhombic, 15-21 × 16-20 cm, base broadly cuneate, apex acute; lateral veins 7 per side; collective veins 3, 1-15 mm from margin; lateral leaflets obliquely ovate, 20-30 × 15-21 cm, base broadly cuneate, apex acuminate. Peduncle emerging from pseudostem, greenish, 40-50 × 0.7-1.2 cm, verruculose and spinulescent. Spathe greenish or dark purple with white stripes, adaxially with ca. 20 longitudinal lamellae 1-3 mm wide; tube cylindric, ca. 5 × 3 cm, throat margins slightly recurved; limb incurved, oblong, ca. 8 × 2-5 cm, apex rounded with acumen ca. 0.5 cm. Spadix unisexual; female zone cylindric, ca. 5.5 × 0.7-1.6 cm; ovary pale green with green stripes, oblong-ovoid, ca. 5 × 2 mm; ovules 9, subbasal; style short; stigma white, pilose; male zone cylindric, ca. 3 × 0.8 cm; synandria stipitate; stipe ca. 1 mm; anthers 3-5 (mostly 4), whitish, obovoid, dehiscing by a horseshoe-shaped slit. Appendix flagelliform, ca. 14 cm, distal part greenish, tortuous, smooth, base swollen to 6 mm in diam., truncate and stipitate, stipe ca. 3 mm.
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