Slender climber reaching forest canopy, or trailing shrub. Branchlets densely lenticellate, more rarely sparsely so. Leaves: petiole 3-8 mm long; blade papery, elliptic to oblong, 2.3-12.4 by 0.6-4.1 cm, 2-4.6 times as long as wide, apex acuminate, base cuneate, glabrous, 8-16 pairs of straight secondary veins, anastomosing into a looped intramarginal vein, tertiary venation reticulate. Inflorescence 2.5-5 cm long, 4-24-flowered; peduncle 0.4-3 cm long; pedicels 1-2.5 mm long; bracts ovate 1.5-5 mm long, puberulent. Sepals 1.3-4 by 0.6-1.8 mm, 1.2-3.1 times as long as wide, ovate, apex acute, pubescent, ciliate. Corolla yellow, base of lobes reddish; tube 4.3-8 mm long, not drawn out into a long tail, widening at 2.5-6 mm, glabrous, 2.1-4.5 times as long as calyx; lobes ovate-linear, 5-10 by 2.2-2.7 mm, glabrous; corona lobes narrow triangular, 0.7-2 mm long. Stamens inserted at 3.6-4.6 mm from corolla base; anthers 4.3-6.1 by 0.7-0.9 mm of which acumen 2.5-4 mm long. Ovaries sparsely and minutely puberulent, 0.7-1.6 mm long; style and style head 4.1-5.1 mm. Fruit 9.5-11.2 by 2.1-3.5 cm, densely lenticellate, fusiform, tapering towards apex. Intact seeds not seen.
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