Woody climber to 20 m. Branchlets glabrous or sparsely rufous pubescent; branches lenticellate. Leaves: petiole 0.7-1.6 cm long; blade elliptic oblong, 6-19.5 by 2.1-4.9 cm, 2.6-4.2 times as long as wide, apex acuminate, base cuneate, papery to subcoriaceous, glabrous or with a few brown hairs on midrib beneath, dull ochre beneath when dry, 12-23 pairs of secondary veins at 55-80°, reaching margin, tertiary venation faint and perpendicular to secondary veins, occasionally with 1 intercalated vein. Inflorescence axillary and terminal, axis longer than subtending petiole, to 4 cm long; 4-19 flowers per inflorescence; axes rufous pubescent; pedicels 1.7-3.8 mm long. Sepals ovate, thick, 1-1.4 mm long, lobes 0.5-0.7 by 0.3-1 mm, 0.6-2 times as long as wide, apex rounded, rufous pubescent, ciliate. Corolla tube cylindrical, 10-14 mm long, c. 10 times as long as calyx, rufous puberulent in 5 rows down tube or glabrous, pubescent in throat; lobes 6-8.2 mm long, oblong or elliptic, ciliate or not. Stamens inserted at 1.1-1.7 mm from corolla base which is 0.11-0.14 of tube length; filaments 0.4-0.8 mm long; anthers 1.3-1.4 by 0.5 mm. Ovary 0.6-0.9 mm; style 0.1-0.2 mm long, impressed on ovary; style head 0.3-0.4 mm long, apex 0.5-0.6 mm long. Fruit spherical, 6.6-8 cm diameter. Seeds c. 2.6 by 1.5 by 1.3 cm.
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