Large woody climber, reported to 15 m high. Branchlets glabrous. Leaves: petiole 7-12 mm long, glabrous; blade elliptic, 4.9-12.7 by 1.7-6.5 cm, 2-3.5 times as long as wide, apex acuminate to subcaudate with a blunt tip, base rounded to acute, glabrous above and beneath, 17-32 pairs of secondary veins, weakly prominent above, only weakly visible beneath, often difficult to distinguish from parallel tertiary venation, tertiary venation also reticulate. Inflorescence terminal and axillary in the axils of upper leaves, 3.5-7 cm long; peduncle 1.2-2.8 cm long, sparsely and minutely puberulent; pedicels 0.8-2.7 mm long, sparsely and minutely puberulent, bracteoles 1 or absent. Calyx 1-1.2 mm long, lobes ovate, 0.5-0.8 by 0.5-0.9 mm, 0.8-1 times as long as wide, apex obtuse to rounded, glabrous, ciliate. Corolla yellow, tinged pink; tube 4-4.7 mm long, 3.6-4.2 times as long as calyx, 1-1.1 times as long as lobes, glabrous outside, pubescent only below stamens inside; lobes narrowly falcate, 3.5-4.2 by 1.3-1.8 mm, 2.3-2.7 times as long as wide, apex acute, glabrous outside and inside. Stamens inserted at 2.3-2.5 mm from corolla base which is 0.5-0.6 of tube length; filaments 0.4-0.5 mm long; anthers 0.8-1.1 by 0.4-0.5 mm. Ovary 1-1.2 mm high; style and style head 1.5-1.6 mm long. Fruit moniliform, total length uncertain due to poor fragmented material, articles 2.4-2.8 by 1.9-2.4 cm, 1.3-1.7 cm between articles. Seeds 14-16 by 13-14 mm.
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