Stem slender, 3-5 mm in diam.; internodes 3-5 cm. Petiole elongated, 8-15 cm, base sheathing; leaf blade light green, after drying black-brown, falcate-lanceolate, 13-23 × 5-8 cm, strongly asymmetric, one side usually 2 × as wide as other, base broadly cuneate or subrounded, margin entire, apex acute; lateral veins many, diverging at 30° from midrib, contracted near margin into a marginal vein. Peduncle pale green, ca. 5.5 cm. Spathe initially green, inrolled fusiform, ca. 7 cm, middle part ca. 2.2 cm in diam., finally spreading, yellow-green to yellow, cymbiform, subovate, 8-9 × ca. 11.5 cm. Stipe of spadix 5-10 mm; spadix obovoid, ca. 4 × 1.8 cm, angustate toward base, apex obtuse. Filaments ca. 4 mm; anthers oblong, ca. 3 mm. Ovary 5-or 6-angular, cylindric, ca. 4 × 5 mm, apex truncate; stigma sessile, nearly circular, 1-loculed, 2-ovuled; ovules subbasal, transversely inserted. Berry green, when mature yellow or red, and bad smelling. Seeds 1 or 2, brown, obovoid-reniform, ca. 2 mm. Fl. Jun-Jul, fr. Jul-Nov.
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