Climber to 30 m. Branches glabrous or, more rarely, sparsely and minutely puberulent; lenticellate. Leaves: petiole 0.6-1.8 cm long; blade elliptic to oblong, 3.9-16.5 by 1.9-6.2 cm, 1.8-3.3 times as long as wide, apex acuminate to subcaudate, base rounded to cuneate, subcoriaceous or coriaceous, dull above and beneath, glabrous, 13-30 pairs of secondary veins at 70-80°, not clearly distinct from the 1-3 intercalated parallel veins. Inflorescence axillary; axis longer than subtending petiole, to 5.3 cm long; 11-17 flowers per inflorescence; axes mostly glabrous, rarely sparsely and minutely puberulent; pedicels 0.8-5 mm long. Sepals ovate, 0.8-1.7 mm long, lobes 0.7-1.3 by 0.7-1.2 mm, 0.7-1.7 times as long as wide, apex rounded or obtuse, glabrous, ciliate. Corolla yellow or yellow becoming red; tube inflated, 1.7-3.5 mm long, outside and inside glabrous; lobes 1.4-2.8 mm long, ovate or elliptic. Stamens inserted at 1.3-2.5 mm from corolla base which is 0.54-0.69 of tube length; filaments 0.3-1 mm long; anthers 0.5-0.7 by 0.3-0.5 mm. Ovary 0.6-1.1 mm long; style 0.7-1.1 mm long, not impressed on ovary; style head 0.1 mm long, indistinct, apex 0.2-0.3 mm long. Fruit spherical, 2.5-5 cm diameter. Seeds oval 2.2 by 1.7 by 0.9 mm.
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