Plants dioecious. Rhizome horizontal, outside pale brown, inside yellowish, cylindric, 7-8 × 5.5-8 cm, bearing some offsets around. Cataphylls 2 or 3, deciduous, transparent, pink, 30-60 cm, membranous. Leaf 1; petiole violet, greenish distally, smooth and not spotted, ca. 80 cm, ca. 3 cm in diam. in proximal pseudostem part; leaf blade 3-foliolate; leaflets with petiolules 2-3.5 cm, blade greenish abaxially, green adaxially, papery, usually covered with hairs; central leaflet narrowly ovate, to 25 × 18 cm, base rounded, apex acuminate with a long tail; lateral leaflets obliquely ovate, to 18 × 17 cm in outline, base outside ca. 2 × as wide as inside, auriculate. Peduncle erect, pinkish green, not spotted, to 25 cm. Spathe dark purple with whitish longitudinal lines; tube cylindric, 8-9 × 2-3 cm, throat margins slightly recurved, smooth on both sides; limb galeate, oblong, 8-10 cm, apex acuminate, tip with an acumen 2.5-5 cm; lateral sides widened, membranous, as wings, with whitish reticulate networks, whitish longitudinal lines from tube connected at middle of limb. Spadix unisexual; female zone subconic, ca. 2.2 × 1.3 cm; ovary pale green, cylindric; stigma sessile; appendix violet, base truncate with a stipe ca. 8 mm, proximally narrowly pyramidal, distally pendulous, filiform, to 50 cm or more in total, somewhat longer in female spadix, smooth; male zone cylindric, ca. 4 cm × 3-8 mm (ca. 8 mm in diam. at base), dark violet; synandria violet consisting of 3 or 4 stamens; connected filaments violet, ca. 1.5 mm; thecae fused, violet, dehiscing by horseshoe-shaped slit. Fl. Mar-Apr. 2n = 26.
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