Underground part a short, tuberous rhizome, ca. 1.5 × 1.2 cm. Petiole 6-12 cm; leaf blade rarely entire and then linear, usually deeply 3-lobed or 3-partite; segments sessile, linear; terminal segment 8-10 cm × 3-8 mm, acuminate; lateral segments horizontally spreading, 1.7-4.5 cm × 3-4 mm. Inflorescence appearing after leaves; peduncle 8-10 cm. Spathe convolute at base, dark purple, basally ovoid, ca. 1.5 × 1.2 cm, apex constricted; limb ovate-lanceolate, ca. 17 × 5-6 cm, distal half narrowed, linear, recurved. Spadix shorter than spathe, 13-17 cm; female zone ca. 5 mm; ovary ovoid, 1-loculed, 1-ovuled; stigma disciform; sterile zone ca. 1.4 cm, proximal 1-2 mm covered with staminodes, rest naked; staminodes downcurved, filiform; male zone 8-18 mm; appendix shortly stipitate, suberect, 10-13 cm, base swollen, 3-5 mm in diam., subtruncate. Berries ovoid, 1-seeded. Fl. and fr. Jul-Aug.
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