Stem scandent, terete, upper internodes 8-12 mm long. LEAVES: Petiole 6-11 cm long, sheath rather wide, up to 1 cm wide, apex obtuse, not reaching the base of the blade. Blade coriaceous, oblong-elliptic, apex cuspidate-acuminate, base obtuse or rounded, 15-22 cm long, 6-8 cm wide; 8 primary lateral veins on each side, conspicuous on the upper surface, ascending arcuately. Leaf sheath broad on both sides of petiole and extending to within 7-8 mm of junction with blade and petiole, slightly produced beyond the insertion; leaf blades deep or rich green above, dull paler green below, midnerve prominent, especially below, 1.5 mm. wide, the 8 primary nerves on each side on lower surface of blade; much more conspicuous than the fine, closely spaced, arcuate-ascending secondary and tertiary nerves. INFLORESCENCE: Peduncle ca. 3.5 cm long, spathe green externally, 11-12.5 cm long, tube ovoid-oblong, 2.5-3 cm wide, somewhat shorter than the oblong blade, apex abruptly cuspidate; Spadix cylindric, somewhat attenuate upwards, obtuse, shorter or longer than the spathe, 10.5-16.5 cm long, 1-1.5 cm thick. Female zone 5-7.5 cm long, ca. 1.5 cm thick. Pistil prismatic, 5 mm long, usually 4-locular, ovules very numerous per locule, biseriate, stigma somewhat larger, rounded; Male zone 8-9 cm long, 1 cm thick; male flowers prismatic.