Root-climbing liana, seldom terrestrial plant. Stern climbing or creeping, its length unknown. Leaf blades (35-)40-55(-60) cm long, subtricostate with the lateral costae to the largest part of their length running in the leaf margin, bifid to ¾-4/5 of their length; the segments 6- 10(-12) cm broad, oblonglanceolate to broadly lanceolate acute to acuminate, in their upper part often secondarily cleft into 2-3 irregualr lobes Petiole as much as 45 cm long; the epidermis of its lower part brownish, hard and glossy brittle. Peduncle during anthesis 10-15 cm long, in fruiting stage as much as 20 cm long the epidermis of its base and of the surrounding sheaths similar to that of the petiole base. Spathes 4, the lower, ones lanceolate, acute, 8-12 cm long, 2-2.5 cm broad, only partially enclosing the spadix; the upper ones broadly lanceolate to ovate, acuminate, 5-8 cm long 2.5- 3 cm broad, wholly enclosing the spadix. Spadix ellipsoid to broadly cylindrical during anthesis 3-5 cm long, 1.5-2 cm thick, in fruiting stage as much as 8 cm long 3 cm thick. Staminate flowers 3.5-4.5 mm long ; receptacle 1.5-2.5 mm diam; perianth-lobes 4-6, 0.7-1.4 mm long, 0.3-0.6 mm broad, obtuse to slightly acute stamens 40-60(-70), anthers 0.8-1.2 mm long, 0.4-0.5 mm broad, filaments 0.1-0.2 mm long, basal bulbs distinct. Pistillate flowers during anthesis 3-4 mm broad, in fruiting stage as much as 7 mm broad; tepals free or slightly connate at at base, rotundate to truncate, 1.5-2.5 mm long, 1.5-2 mm broad at base, 2-2.5 mm broad in their upper part, about as high as the stigmas; styles free, at most I mm long; stigmas seen from above flat or nearly so, lanceolate to ovate, obtuse to slightly pointed, sometimes unicinate, • during anthesis slightly to distinctly projecting between the tepals, in fruiting stage often turned upward and then wholly encircled by the tepals; staminodes white (fide KILLIP & SMITH), their length unknown. Seeds r.z-r.6 mm long, 0.5-0.7 mm broad.