Large woody climber to 15 m high. Branchlets glabrous, rarely puberulent. Leaves: petioles 3-25 mm long; blades elliptic to obovate, 2.5-14.8 by 1.1-5.8 cm, 1.6-3.7 times as long as wide, apex shortly acuminate to obtuse or apiculate, rarely rounded, base rounded to cuneate, glabrous above and beneath, 17-30 pairs of secondary veins, weakly distinguishable above and beneath to obscure beneath, tertiary venation weakly intercalcated and parallel, often obscure. Inflorescence terminal and axillary in uppermost leaf axils (sometimes these uppermost leaves greatly reduced in size), forming a terminal panicle mostly longer than subtending leaves, occasionally shorter, 3.2-13.7 cm long, lax, puberulent to completely glabrous except occasionally for a few hairs on bracts; peduncle 2-4.6 cm long; pedicels 1.4-2.5 mm long, with 1 or 2 bracteoles, sometimes with some bracts empty giving the appearance of a much longer pedicel with distant opposite bracts. Calyx 1.2-1.5 mm long, lobes 0.5-0.6 by 0.7-0.9 mm, 0.6-0.8 times as long as wide, apex obtuse to rounded, often spreading or slightly reflexed, glabrous or papillate-pubescent, ciliate. Corolla yellow or orange; tube 6.8-8.2 mm long, 4.5-6.3 times as long as sepals, 1.6-3 times as long as lobes, glabrous to minutely and sparsely papillate-pubescent outside, pubescent below stamens inside; lobes falcate, 2.3-5 by 1.2-1.8 mm, 1.8-2.8 times as long as wide, apex acute to acuminate, glabrous to pubescent on part exposed in bud outside, sometimes only with minute papillate hairs, glabrous inside. Stamens inserted at 2-3.1 mm from corolla base which is 0.3-0.4 of tube length; filaments 0.7 mm long; anthers 0.9-1.2 by 0.3 mm. Ovary 1.1-1.3 mm long; style and style head 1.5-1.6 mm long. Fruit fusiform but with one or more slight constrictions, 5.5-10.5 by 1.5-2.7 cm. Seeds quite large but no undamaged ones measured.
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