Climber, reported to 20 m high. Branchlets glabrous. Leaves: petiole 5-20 mm long, glabrous; blade elliptic, obovate or spathulate, (2.1-)3.9-16.5 by (0.8-)1.3-6.5 cm, 1.7-4.3 times as long as wide, apex rounded to shortly acuminate or apiculate, base cuneate, glabrous above and beneath, 18-43 pairs of secondary veins (but often difficult to count and distinguish from tertiary venation), these obscure beneath and weakly visible to obscure above, anastomosing into an intramarginal vein, tertiary venation parallel to and not very distinct from secondary veins, or obscure. Inflorescence axillary, shorter than to as long as subtending petiole, to 1.6 cm long, flowers densely congested, glabrous; peduncle 0-0.3 cm long; flowers subsessile or pedicels to 1 mm long; bracteoles 1-several. Calyx thin, ovate, 1-1.5 by 1-1.2 mm, 1-1.2 times as long as wide, apex rounded, glabrous, ciliate. Corolla yellow, tube 4.5-6.8 mm long, 3.7-6.2 times as long as sepals, 1.1-1.6 times as long as lobes, glabrous outside, pubescent below the stamens inside; lobes falcate, 3.1-5.5 by 1.2-1.9 mm, 2.6-3.3 times as long as wide, apex acute to obtuse, glabrous outside and inside. Stamens inserted at 2-3.8 mm from corolla base which is 0.3-0.5 of tube length; filaments 0.5-0.6 mm long; anthers 0.9-1.1 by 0.3-0.4 mm. Ovary ovoid, 0.7-1.3 mm high; style and style head 1.3-2.5 mm long. Fruit 4.2-9 by 1.9-4.2 cm, orange, smooth to densely tuberculate. Seeds 6.5-8.5 by 4.5-5.3 by 3.9-4 mm.
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