Woody climber growing up to more than 30 m high, with copious white latex. Branchlets glabrous to densely minutely puberulent; sparsely to densely lenticellate. Leaves: petiole 11-22 mm long, glabrous or minutely puberulent; blade elliptic, 6.3-17.2 by 1.7-5.3 cm, 2.5-4.4 times as long as wide, apex mostly acuminate, rarely to rounded, base cuneate to rounded, glabrous or sparsely puberulent on midrib and on margin above, glabrous or puberulent on midrib beneath, 5-10 pairs of secondary veins at 70-90° from midrib, usually ascending towards intramarginal vein, sometimes somewhat obscure, anastomosing into an intramarginal vein, tertiary venation obscure. Inflorescence 2.4-11 cm long; peduncle 0.6-7.2 cm long, sparsely to densely minutely puberulent; pedicels 3.7-5 mm long, sparsely to densely minutely puberulent. Sepals ovate, 1.7-2.5 by 1.2-2.1 mm, 1-1.4 times as long as wide, apex obtuse to rounded, glabrous or with few hairs at top, ciliate. Corolla yellow or orange; tube 4.2-9 by 1.2-1.4 mm, glabrous outside and inside; lobes 3-4 by 3.2-3.6 mm, c. 0.8 times as long as wide, obliquely suborbicular, apex rounded, minutely puberulent outside and inside, more rarely glabrous. Stamens inserted at 3.5-3.8 mm from corolla base which is 0.4 of tube length; filament c. 1 mm long; anthers 2.4-3.2 by 0.6-0.8 mm, tip of anthers at corolla throat or further down tube. Ovary 0.8-1.2 mm high; style 1.4-1.5 mm long; style head 0.8-1 mm long. Fruit to 6.7 cm long, 4 cm circumference (see note 2), ellipsoid or wider near base, frequently strongly wrinkled when immature, 1-or 2-seeded. Seeds to 5.7 by 3.3 by 2.7 cm.
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