Climber, reported to 20 m high. Branchlets not lenticellate; sparsely to densely brown pubescent, glabrescent with age. Leaves: petiole 2-15 mm long, glabrous to densely pubescent; blade elliptic to slightly obovate, 1.7-16.2 by 0.9-7 cm, 1.5-4 times as long as wide, apex acuminate with a sharp tip, rarely apiculate, base cuneate to obtuse, glabrous, with few hairs on midrib or sparsely pubescent all over and more densely on midrib above, pubescent in the secondary vein axils to all over beneath, more rarely with only a few hairs on midrib beneath, 5-9(-11) pairs of secondary veins, tertiary venation laxly reticulate. Inflorescence of terminal and axillary umbelliform cymes, 3-6.5 cm long; peduncle 0.2-2.9 cm long, densely brown pubescent; pedicels 1.8-5 mm long, densely brown pubescent. Sepals narrowly ovate, 1.2-3 by 0.5-1.2 mm, 1.6-3.1 times as long as wide, apex acute to acuminate, densely brown pubescent, colleters absent inside. Corolla white or cream, fragrant; tube slightly twisted or not, 15-27 by 1.7-2.8 mm, 6-11.4 times as long as sepals, 2-4.1 times as long as lobes, densely pubescent outside, glabrous at very base and then densely pubescent towards upper half of tube inside, villous in throat; lobes 4-10 by 3-6 mm, 1.3-2 times as long as wide, falcate with a sharp projection on one side, densely pubescent on part of lobes exposed in bud outside, glabrous inside. Stamens inserted at 2.1-3.2 mm from corolla base which is 0.1-0.2 of tube length in rehydrated flowers; filaments 0.7-1 mm long; anthers 3.1-5.1 by 0.6-1 mm. Disk a ring with a slightly to strongly crenate margin, 0.5-0.6 mm high. Ovaries semi-inferior, 0.7-1.2 mm high, glabrous; style 1.9-2.7 mm long; style head 1.5-2.5 mm long. Fruit narrowly linear or very slightly torulose, 9.8-33 cm by 3-4 mm, densely to very sparsely pubescent or glabrous. Seeds 13.5-31 by 2-2.7 mm; coma 17-34 mm long.
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