Large or small woody climber. Branchlets densely puberulent; glabrescent when older. Leaves: petiole 8-15 mm long, densely puberulent; blade elliptic or oblong, 6.6-26.5 by 2.2-13 cm, 2.1-3.6 times as long as wide, apex acuminate, sometimes obtuse and apiculate, base rounded to acute, 14-27 pairs of secondary veins, very prominent beneath, tertiary venation of weaker interstitial veins and reticulate veins, glabrous above, sparsely to densely pubescent all over beneath, more densely so on midrib, occasionally pubescent only on midrib and secondary veins, very rarely glabrous. Inflorescence in the axils of leaves (rarely pseudoterminal), much shorter than the leaves, ultimate branches fairly congested, 3-5.7 cm long; peduncle 1.2-3.7 cm long, sparsely to densely puberulent; pedicels 2.8-3.5 mm long, with 0-2 bracteoles, puberulent. Calyx 1.1-1.2 mm long, lobes 0.7-0.9 by 0.9-1.1 mm, c. 0.8 times as long as wide, apex rounded, glabrous to sparsely puberulent, ciliate. Corolla only known in bud, yellowish, sometimes with purple or reddish tinge at base; tube (immature) 6-8 mm long, pubescent outside in the lower half; lobes only known from buds but unfurled lobes with acute apex. Stamens inserted at 3.1-3.5 mm from corolla base; filament 0.5-0.7 mm long; anthers 1.1-1.2 by 0.3-0.4 mm. Ovary 1.3-1.4 mm long; style and style head 2-2.6 mm long. Fruit linear, torulose, 35-40 cm by 7-10 mm.
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