Rhizome oblique or horizontal, light brown outside, violaceous in section, cylindric, 3-6 × 2-3 cm. Cataphylls 3 or 4, grayish brown with purplish and black spots, longest one 10-15 cm, apex mucronate. Leaves 2; petiole green, marked with purple, to 30 cm, proximal 15-25 cm forming pseudostem; leaf blade 3-foliolate, paler and evidently veined abaxially, shiny green adaxially; central leaflet elliptic, 9.5-10 × 3.2-3.5 cm, aristate at apex, with a tip 8-11 mm; lateral ones slightly smaller. Peduncle erect, overtopping leaves. Spathe green tinged except for white center, ca. 12 cm, with proximal margins incurved or ± overlapping to form a cylindric tube to 6 × 2.7 cm, scarcely or slightly auriculate at throat; limb subovate-lanceolate, ca. 8 × 4 cm, apex aristate and recurved. Male spadix subsessile, ca. 16 cm; fertile zone green, subterete, gradually attenuate distally, ca. 4 cm, loosely flowered; male flowers stipitate, usually diandrous; stipe 0.2-0.9 mm; thecae ellipsoid, 0.4-0.7 mm; appendix extending beyond throat of spathe tube, recurved, greenish, horsetail-shaped, ca. 12 cm, with many filiform subulate neuter flowers; proximal neuter flowers scattered, 3-4 mm; distal ones numerous and crowded, 2.5-5.5 cm. Female spadix unknown. Fl. Jun.
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