Large woody climber to 25 m high. Branchlets glabrous. Leaves: petiole 7-21 mm long; blade coriaceous, elliptic to obovate, 2.9-23.5 by 0.9-12.5 cm, 1.5-3.8 times as long as wide, apex acuminate to rounded and apiculate, base acute to cuneate, glabrous above and beneath, 11-24 pairs of secondary veins, prominent beneath, with weaker parallel tertiary veins. Inflorescence axillary, 2-13 cm long; peduncle 0.3-5.5 cm long, glabrous to puberulent; pedicels 1-4.5 mm long, glabrous to puberulent, bracteoles 0-2. Calyx thick, connate at base, 1-2 mm long, lobes ovate, 0.6-1.4 by 0.6-1.4 mm, 0.7-1.3 times as long as wide, apex rounded, glabrous, ciliate. Corolla white, yellow, orange or red; tube 6-21.5 mm long, 5.5-10.5 times as long as calyx, 0.9-2 times as long as lobes, glabrous outside, densely pubescent below stamens inside; lobes 4.5-19 by 1.8-5.4 mm, 1.5-3.9 times as long as wide, apex obtuse to acuminate, glabrous outside and inside. Stamens inserted at 2.1-3.8 mm from corolla base which is 0.2-0.4 of tube length; filaments 0.3-0.8 mm long; anthers 1.1-1.4 by 0.3-0.5 mm. Ovary 1-2 mm long; style and style head 0.8-2.4 mm long. Fruit ellipsoid or globular, glabrous, 2.2-8.9 by 2-4.2 by 2-4 cm. Seeds 5.6-8 by 4.5-5.8 by 1.8-5.4 mm, reported on one specimen to be purple.
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