Climber. Branches puberulent when young, becoming glabrous. Leaves: petiole 1-1.5 cm long; blade ovate, elliptic or obovate, 1.8-3.1 times as long as wide, 8.4-16 by 2.5-9 cm, apex long acuminate, base rounded to cuneate; glabrous or sparsely puberulent on midrib beneath; 7-11 pairs of secondary veins. Inflorescence of axillary and terminal panicles, 7.5-17 cm long; peduncle glabrous or sparsely puberulent; pedicels sparsely puberulent, 1.1-1.5 mm long. Sepals ovate, 1.1-1.5 times as long as wide, 0.9-1.5 by 0.8-1.1 mm, apex obtuse to rounded, very sparsely puberulent or glabrous, ciliate; no colleters seen. Corolla yellow with red lobes; in bud the tube is cylindrical with head about the same width; tube 2.8-3.4 by 1.9-2 mm, 2.9-4.7 times as long as calyx, 1-1.3 times as long as lobes, glabrous outside, with a thick row of hairs at the throat; lobes 2.3-3.1 by 0.9-1.1 mm, 2.4-3.2 times as long as wide, glabrous. Stamens inserted 1.2-1.3 mm from base, 0.3-0.4 of tube length; filament 0.5-0.7 mm long, with projections or swellings at the sides; anthers 3.2-4 times as long as wide, 1.2-1.6 by 0.3-0.5 mm; narrow triangular, apex acuminate, base sagittate; included in the corolla tube. Disk of 5 oblong lobes, slightly narrower at the top, 0.8-1 times as long as the ovary, 0.7-1 mm long. Ovaries 0.7-1 mm long, pubescent; style 0.8-0.9 mm long; style head 0.6-0.9 mm long with a cup-shaped base. Fruit (immature) fusiform, warty lenticellate, 3.7-8.9 cm by 4.5-6 mm.
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