Tall climber, hanging from lofty trees, 20-30 m long; shoots slender, 1.5-4 mm diam., early glabrescent, at first with minute red brown powdery hairs less than 0.1 mm long; older twigs with raised leaf-scars. Tendrils 10-15 cm long, adhesive pads 2-6 mm diameter. Leaves: petiole 0.5-3 cm long, 1-2 mm wide; blade faintly laterally lobed towards the base, membranous or slightly succulent, broadly ovate, 3-15 by 2-12 cm, membranous and brittle on drying, glabrous, base (broadly) rounded or shallowly cordate with broad sinus, margin (sub)entire; 5(-7) palmately veined, venation lax. Male inflorescences spike-like, indeterminate panicles, bracteate; peduncle 0.5-1 cm long, up-curved, rachis 5-20 cm long, c. 2 mm thick, purple-red; bracts, subcaducous, 5-15 mm long, each with axillary a cluster of 2-5 flowers. Female inflorescences (according to infructescences) small, less than 5 mm long, 1 (or few)-flowered. Male flowers somewhat fleshy, pedicel c. 4 mm long; receptacle-tube shallowly cup-shaped, c. 5 mm diam., c. 0.5 mm thick, firm-fleshy (disc); sepals broadly obtuse-triangular, c. 2 mm long, together with the receptacle-tube showing up from beneath as a pale green pentagon c. 9 mm diam.; perianth circular in outline, c. 12 mm diam.; petals broadly obovate, 3.5-4.5 by 4-5 mm, inside papillose; filaments somewhat tapering, 1.2-1.5 mm long, whitish, anthers c. 2 mm long. Female flowers not known. Fruit pendent, green, ripening brown, smooth, glabrous, opening at the flat apex by 3 bluntly triangular inward curving valves, 20-25 by 8-10 cm, base ± narrowed, subacute, apex flattened, pericarp woody, c. 0.5 mm thick, inside with a spongy-fibrous layer c. 10 mm thick, line of perianth-scar 0.5-1(-1.5) cm below the orifice; fruiting pedicel 1-1.2 cm long, 2-3 mm tick. Seeds densely packed in 3 rows throughout the fruit, dull brown, elliptic, 15-20 by 10 mm, faces finely warty, the edge with 8 (or 9) coarse, blunt spines 3-9 mm long, with a conspicuous membranous whitish subcircular wing around the seed, c. 5 cm diameter.
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