Climber to 10 m long, at first with sparse grey-brown hairs, early glabrescent (except male bracts), leafy stem 2-5 mm diam.; dioecious. Probract (narrowly) ovate, 4-7 by 1.5-2.5 mm, glands absent. Tendrils unbranched. Leaves: petiole 3-8 cm long; blade pale greenish brown on drying, (sub)chartaceous, simple, deeply (2-)3-5-lobed to 9/10 deep, or unlobed (variously lobed in young stages), in outline broadly (ob)ovate or subcircular, 10-20(-30) by 5-15(-40) cm, glabrous above and beneath, sometimes scabrous, glands few to several, scattered, 0.5 mm diam., cystoliths not obvious, base cuneate-decurrent near the insertion of the petiole, margin entire, rarely undulate-dentate, apex (sub)obtuse or acute-acuminate; 3-5(-7) subpalmately veined, veins (nearly) straight; lobes triangular or (lanceolate) oblong. Male raceme: peduncle 3-13 cm long, 3-5 mm thick; rachis thickened, 7-9 cm long, 10-20 mm thick, including conspicuous bract scars, many-flowered; bracts caducous, pale yellow on drying, membranous, obovate, (35-)50-70 by 25-30 mm, densely soft hairy, margin entire or shallowly few-lobed at apex, glands minute. Male flowers: pedicel (10-)30-45 mm long, caducous; receptacle-tube 60-70 mm long, at throat 7-8 mm wide; sepals narrowly ovate-triangular, 10-15 mm long, 2-3(-5) mm wide at base, margin entire, apex long-acuminate; petals broadly obovate-rhomboid, 13-20 mm long, threads (yellow in Sabah, once seen), 11-15 mm long, synandrium 8-11 mm long, filaments glabrous, 2-3.5 mm long. Female flowers: pedicel 20-22 mm long; ovary glabrous, ellipsoid, c. 15 by 7.5 mm; perianth not known. Fruit ripening evenly bright red, globose, 5.5-12 by 6-12 cm, apex not beaked; exocarp thinly woody, smooth; dry pericarp 10 mm thick; pulp green-black; fruiting pedicel 2-6.5 cm long, 10-20 mm thick. Seeds brown or black, compressed, ovate or narrowly elliptic, 15-20 by 7-9 by c. 3 mm, base and apex rounded, margin present but inconspicuous, edge entire.
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