Woody climber to 33 m. Branchlets glabrous or sparsely brown pubescent; older glabrous, lenticellate. Leaves: petiole 1.1-1.8 cm long; blade oblong to obovate, 6-17 by 3.7-6.6 cm, 1.5-2.6 times as long as wide, apex acuminate, base rounded to cuneate, papery to subcoriaceous, glabrous or with a few hairs on the midrib beneath, 11-19 pairs of secondary veins at 60-80°, reaching margin, tertiary venation clearly visible beneath, perpendicular to secondary veins and meeting between them. Inflorescence axillary, axis shorter than subtending petiole, to 2.5 cm long; 8-14 flowers per inflorescence; axes brown pubescent; pedicels 1-2.8 mm long. Sepals ovate, 1.3-2.5 mm long, lobes 0.6-1.2 by 0.5-1 mm, 1-1.3 times as long as wide, apex rounded to acute, brown pubescent. Corolla white; tube cylindrical, 4.8-6.5 mm long, outside glabrous or with 5 rows of brown hairs, inside puberulent; lobes 2-6.5 mm long, oblong, ciliate. Stamens inserted at 2.6-2.8 mm from corolla base which is 0.32-0.36 of tube length; filaments 0.6-0.7 mm long; anthers 1.4-1.5 by 0.3-0.4 mm. Ovary 0.4-1.1 mm long; style 0.1-0.3 mm long, often impressed on ovary; style head 0.6 mm long, apex 0.7-0.8 mm long. Fruit spherical to 4-17.6 by 4-12 cm. Seeds c. 1.7 by 1.2 by 1.1 cm.
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