Plants perennial, evergreen, basically dioecious. Rhizome ca. 5 × 2.5 cm. Pseudostem absent. Leaves 1-4 together; petiole dull dark brown to violet, with light brown transverse markings, cylindric, ca. 25 × 0.5-1 cm; leaf blade pedate with 3-5 segments; leaflets petiolulate, greenish, lanceolate, membranous, apex acute ending in a short arista; central leaflet with petiolule to 3 cm, blade ca. 15 × 5 cm, lateral veins numerous, base cuneate; lateral leaflets with petiolule to 5 mm, blade 12-15 × 3-4 cm, base obliquely cuneate. Peduncle whitish, cylindric, much shorter than petioles, ca. 2 × 0.5 cm, surrounded by 3 cataphylls; cataphylls light brown, oblong, ca. 2, 4, and 6 cm, respectively. Spathe: tube white-green, with numerous green longitudinal stripes, cylindric, ca. 3 × 1.5 cm, throat margin widely recurved; limb arched over tube, green, with darker longitudinal veins, ovate-lanceolate, ca. 7 × 4 cm, apex acuminate, ending in a tail ca. 1 cm. Spadix unisexual; female zone conic, 13-15 × 5-10 mm; ovaries congested, green, fusiform, with 1 basal locule, each locule containing 3 ovules, fusiform and slightly curved; stigma disciform, borne on a short style; male zone cylindric, ca. 2 × 0.5 cm; stamens loosely arranged, each consisting of 3-6 anthers, stipitate; thecae yellowish, subglobose, dehiscing by oblong pores; appendix sessile, dark green to purple, slender, 15-40 × 1.5-3 mm, covered with numerous ascending filiform neuter flowers throughout its length; neuter flowers in distal section accompanied by an axillary budlike structure. Fl. Nov.
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