Large woody climber to 15 m high. Branchlets lenticellate, glabrous to minutely puberulent. Leaves: petiole 20-32 mm long, often slightly swollen at base and opposite bases forming a ridge across the stem, glabrous; blade coriaceous, elliptic, 4.5-19 by 2.3-8.6 cm, 1.4-3.1 times as long as wide, apex acuminate to rounded, base cuneate to rounded or truncate, glabrous above and beneath, rarely sparsely puberulent on midrib beneath, 2-5 pairs of secondary veins, 70-90° from midrib, straight, widely spaced, anastomosing into an intramarginal vein, tertiary venation faint and parallel to secondary veins. Inflorescence short, congested, 2.2-4 cm long; peduncle 0.2-1 cm long, minutely puberulent; pedicels c. 1 mm long, glabrous to densely puberulent. Sepals ovate, 2.4-3.7 by 1.8-3 mm, 1.2-1.8 times as long as wide, apex acute to rounded, glabrous at base, minutely puberulent at apex, ciliate. Corolla yellow-orange; tube 8.5-11.2 by 2.1-2.8 mm, 2.4-3.8 times as long as sepals, 2.1-4.5 times as long as lobes, glabrous outside, densely minutely puberulent at base inside becoming sparser higher up tube; lobes 2-5.5 by 3-7 mm, 0.7-1.1 times as long as wide, obliquely suborbicular, apex rounded, glabrous or sparsely to densely minutely puberulent outside, glabrous or minutely puberulent inside in upper part. Stamens inserted at 5-7.4 mm from corolla base which is c. 0.6 of tube length; anthers 3.2-3.6 by 0.5-1.2 mm, apex at corolla throat. Ovary 1.2-2 mm high, glabrous; style 1.7-2 mm long; style head 0.5-0.9 mm long. Fruit globose to ovoid, 3-4.6 by 2.4-3 cm, smooth.
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