Rhizome cylindric, 3-6 cm × 4-10 mm, usually curved and branched. Petiole 11-26 cm; leaf blade green, sometimes purple, oblong-sagittate to ovate, distal part ovate, 6-14 × 5-6 cm, base cordate or truncate, apex abruptly acuminate or acute; basal lobes, if present, spreading, ovate, deltoid, or oblong. Peduncle 6-9 cm, slender. Spathe convolute at base, yellowish, with purple spots, 6-10 cm, basal 2-3 cm ovoid, constricted at apex; limb spreading or slightly recurved, purple, lanceolate, 4-6 cm, apex long acuminate. Spadix shorter than spathe, 5-7 cm; female zone ca. 3 mm; ovary subglobose, 1-loculed, 1-ovuled; stigma subsessile, violet; sterile zone 1.5-2 cm, proximal 5-7 mm with densely congested staminodes, rest naked; staminodes variously curled, filiform, 3-4 mm; male zone cylindric, 6-8 × 1.5-2 mm; appendix sessile, erect, narrowly conic, 2-3.9 cm × 3-4 mm, base truncate. Fl. Apr-May, fr. Jun.
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