Lianas, medium to large, to 15 m, moderately robust. Stem mid-green, cylindric, 8-12[-20] mm in diam., internodes short, 5-10 mm. Leaves clustered at shoot tips; petiole 12-30 cm, channeled, margins sharp; pulvini distinct, 1-2 cm; petiolar sheath reaching to or just short of apical pulvinus; leaf blade obliquely oblong, 27.5-45 × 15-30 cm, thinly leathery, midrib and primary veins minutely pubescent, base rounded, truncate, or subcordate, apex with an acumen 15-20 mm; primary lateral veins diverging at 40-70° from midrib (angle smaller toward apex of blade). Inflorescences solitary at tips of free lateral shoots; peduncle pendent, 3-5 cm, subtended by 1 or 2 cataphylls; cataphylls caducous, ovate or ovate-lanceolate, 3-6 cm. Spathe outside green or gray-green, inside yellow, oblong-ovate, 5-6[-10] cm, thick, rostrum ca. 15 mm. Spadix sessile, yellow, obovoid, cylindric, or elliptic, 4.5-5.5 × 1.5-1.75 cm, at fruiting stage ca. 8.5 × 3.5 cm. Filaments ca. 2 mm; anthers oblong; staminodes 4, usually around base of ovary in distal part of spadix. Ovary hexagonal-cylindric; stigma subsessile, yellow, drying brown, longitudinally oblong; ovules many with slender funicle. Infructescences pendent from tips of lateral shoots, broadly cylindric, 10-14 × ca. 3 cm; stigmas prominent. Fl. Mar-Jul.
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