Large woody climber. Branchlets sparsely and minutely puberulent at least when young, very rarely glabrous. Leaves: petiole 6-15 mm long, glabrous or puberulent; blade elliptic, 3-13.5 by 0.9-6.7 cm, 1.9-4.3 times as long as wide, apex acuminate or obtuse and apiculate, glabrous above and beneath, 12-20 pairs of secondary veins, clearly visible above and beneath, prominent beneath, tertiary venation of weaker intercalcated veins and reticulate. Inflorescence axillary, 1.3-4 cm long, much shorter than the subtending leaf; peduncles 0-2.1 cm long, sparsely to densely and minutely puberulent; pedicels 1.5-8 mm long, sparsely to densely and minutely puberulent, with several to numerous bracteoles. Calyx 1-1.2 mm long, slightly reflexed, connate at base, lobes 0.5-1 by 0.7-1 mm, 0.7-1 times as long as wide, apex rounded, glabrous, ciliate. Corolla yellowish or orange-yellow; tube 4.2-6 mm long, 5-6 times as long as sepals, 1.2-1.6 times as long as lobes, glabrous outside, densely pubescent below stamens inside; lobes 3.2-5.1 by 1.2-1.7 mm, 2.6-3 times as long as wide, apex acuminate, glabrous outside and inside. Stamens inserted at 1.5-2.4 mm from corolla base which is 0.3-0.5 of tube length; filament 0.4-0.7 mm long; anthers 0.9-1.2 by 0.3-0.4 mm. Ovary 0.9-1.2 mm long; style and style head 1.1-1.9 mm long. Fruit dull orange, ovoid, 4.5-9 by 2.4-3.7 cm. Seeds 7-10 by 5-7.2 by 4.5-5.7 mm.
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