Liana up to 20 m long; stems to 16 cm diam. at base, or a shrub with scandent or creeping branches; fresh bark yellow or whitish, blotched, greyish brown when dried, grooved, thick, rather tough, exudating a colourless or red, bitter, sticky juice. Petiole 4-9 mm long; blades thin-coriaceous, deep green above, dull green beneath, when dried olivaceous or greyish above, slightly scabrous on both sides, ovate to oblong-elliptic, 5-10(-20) x 2.5-4.5(-8) cm (dimensions very variable on the same branch, smallest in the flowering twigs); primary vein prominent on both sides, secondary veins 5-7(-9) per side, arcuately ascending, prominulous above, prominent beneath, tertiary veins parallel, prominulous above, prominent beneath. Inflorescence 3-12 cm long, tomentellous; peduncle 2.5-6 cm long; bracts and bracteoles oblong-deltoid, acute, ca. 1 mm long, slightly fimbriolate; pedicels slender, 2-4(-7) mm long; buds globose. Flowers fragrant, 9-12 mm diam.; 3 smaller sepals deltoid, acute, almost entire, 1.5-2 mm long and wide, 2 larger ones rounded, 3-4 mm long and wide, irregularly erosulous towards the apex; petals green to pale yellowish green or yellow, membranous, rounded, to 5 x 6 mm, slightly unguiculate, flabellately veined; disk ca. 6 mm diam., 0.5 mm thick, pilose when young, except for the undulate margin; filaments pilose at base, 2.5 mm long, anthers white, 0.5-0.7 mm long, 0.8-1.3 mm broad; style in full-grown flower with a bright orange stigmatic knob. Fruiting pedicel to 3 mm diam. Mericarps 5.5-8 x 4-6 cm, rounded or truncate or slightly emarginate at apex, narrowed towards base; pericarp coriaceous, scabrous, bluntly ribbed, ca. 1 mm thick distally, dull, pale green, turning brown; seeds with an ovoid, coriaceous, embryoniferous part 1.5 cm long, 8 mm broad, at an angle of ca. 15 ° with the chartaceous wing, wing (white when fresh), elliptic or obovate, 4-6 x 2-3 cm.
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