Plants monoecious and male. Tuber renewed seasonally, subglobose, 1-3 cm in diam. Cataphylls 2 or 3, grayish green, with dark purple striae and spots, 10-28 cm. Leaves 1 or 2; petiole grayish with purple striae and spots, 25-70 cm, proximal 1/2-3/4 sheathing into pseudostem; leaf blade green, membranous, 3-foliolate; leaflets subsessile; central leaflet ovate-lanceolate, 22-25 × 9-10 cm, base cuneate, apex acuminate; lateral leaflets obliquely ovate, 17-18 × 5-10 cm. Peduncle shorter than petioles. Spathe green with white longitudinal stripes on back; tube cylindric, 4-5 × ca. 1 cm, throat margin obliquely truncate, not auriculate; limb erect, lanceolate, 6-10 × 1.5-2.5 cm, apex acuminate, with short tail. Spadix bisexual or male. Male spadix: male zone ca. 3 cm, base 4-5 mm in diam.; synandria of 2 stamens; thecae purple, ovoid, opening by an apical longitudinal slit. Bisexual spadix: female zone proximal, cylindric, 2.3-3 cm × 5-6 mm; ovary green, obovoid; ovules 3; stigma subsessile; male zone distal, 1-3.5 cm × ca. 4 mm; synandria as in male spadix. Appendix pendulous, usually dark purple, filiform, to 80 cm. Fl. Jun.
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