Large woody climber to 30 m high. Branches often with flaking bark, glabrous. Leaves: petiole 0.7-1.8 cm long, glabrous; blade papery to subcoriaceous, elliptic to oblong, rarely somewhat obovate, 4-13.5 by 1.5-6 cm, 1.9-3.6 times as long as wide, apex abruptly caudate or acuminate, base rounded to cuneate, glabrous above and beneath, 7-15 pairs of secondary veins almost perpendicular to midrib, anastomosing to form a faint intramarginal vein, tertiary venation faint and subparallel to secondary veins or reticulate. Inflorescence 4-10 cm long, many-flowered; peduncle 1.8-5.7 cm long, puberulent; pedicels 1-4 mm long, puberulent. Sepals ovate, 0.8-1.7 by 0.6-1.2 mm, 1.7-1.9 times as long as wide, apex obtuse; glabrous, ciliate. Corolla white or pale yellow; tube 1.6-3.4 by 1-1.3 mm, 1.6-2.8 times as long as calyx, 0.8-1.7 times as long as lobes, glabrous outside, pubescent in lines between anthers inside; lobes 1.7-3.8 by 0.8-1.2 mm, 2.5-3.2 times as long as wide, oblong, margins usually slightly inrolled, glabrous or sparsely puberulent on lobes outside. Stamens inserted at 0.2-0.3 of corolla tube length from base; anthers 1.8-2.8 by 0.5-0.6 mm, puberulent on back at apex and at filamentsinsertion on front. Disk 0.6-0.7 mm, lobes notched. Ovaries 0.5-0.9 mm long, glabrous; style and style head 1-1.4 mm long. Fruit 7-25 by 0.5-1.5 cm, not lenticellate. Seeds: grain 24-30 by 3.2-5 mm, plus a beak of 4-7 mm long; coma 3.5-5 cm long.
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Lianas to 35 m, glabrous throughout except for corolla throat. Stems to 5 cm in diam., dark brown; branchlets pale brown. Petiole 0.7-2 cm; leaf blade elliptic, oblong, or subobovate, rarely narrowly ovate, 7-16 X 2-6.5 cm, base cuneate or rounded, apex caudate-acuminate; lateral veins 10-14 pairs, at ca. 90° to midvein. Cymes 4-7 cm, usually 3-branched. Corolla yellow or yellowish; tube short cylindric, 1.6-2.5 mm, throat pubescent; lobes oblong, 1-3.2 X 0.1-1 mm. Stamens inserted near base or below middle of corolla tube; filaments minutely pubescent adaxially; anthers sagittate, ca. 2.5 mm; disc shorter than ovary. Follicles 2, linear, 7-22 X (0.5-)1-1.5 cm. Seeds narrowly fusiform, 2-3 cm, coma to 4 cm. Fl. Apr-Jul, fr. Jul-Oct.