Underground part a subglobose tuber, 1-1.5 cm high, 0.5-1.2 cm in diam., producing annual offsets. Petiole 10-30 cm; leaf blade simple and ovate-lanceolate, 2-22 × 1-25 cm, cuneate to hastate, 3-5-lobed or pedately 5-9-sect, lobes elliptic to linear. Inflorescence appearing just before or alongside leaves; peduncle 3-14 cm. Spathe base oblong-ovoid, 2-4 × 1-2 cm; limb outside green, sometimes flushed with purple or purple all over, inside dark purple or greenish with dark purple veins and flushes, oblong-lanceolate, 4-13 × 2-5 cm, apex acuminate to shortly caudate. Spadix shorter than spathe, 4-12 cm; female zone cylindric, 0.5-1.5 cm × 4-7 mm; ovary: basal half white, apical half purple, ellipsoid; stigma sessile, white; sterile zone 1-3 cm, base swollen and with long staminodes, rest fusiform, with verrucate staminodal structures; proximal staminodes clavate, with only apical part distinctly and abruptly swollen, basal part filiform, whitish with purple flushes, clavate part yellow with a purple tip or purple; staminodal structures consisting of narrowly elliptic, shallow ridges with verrucate-corrugate surface, white, pale purple, or violet; male zone cylindric, 0.6-1.3 cm × 1.5-7 mm; appendix blackish purple, broadly to narrowly cylindric, 1-7 cm × 2-8 mm, obtuse or subacute.
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