Woody climber. Branchlets densely golden pubescent. Leaves: petiole 12-55 mm long, sparsely to densely pubescent; blade elliptic to orbicular, 11-19.4 by 6.7-16 cm, 1.2-1.9 times as long as wide, apex rounded, acuminate or apiculate, base rounded to subcordate, densely pubescent or only sparsely so on blade and more densely on venation above, densely pubescent beneath, 8-11 pairs of secondary veins, tertiary venation subscalariform and reticulate. Inflorescence terminal, 5-20 cm long; peduncle 2.3-10 cm long, densely pubescent; pedicels 7-12 mm long, densely pubescent. Calyx of a tube and small lobes, 11-14.5 mm long, sparsely to densely pubescent outside, tube 0.71-0.93 of calyx length; lobes 0.9-4.7 by 2-3 mm, 0.5-1.6 times as long as wide, apex acute; colleters inside densely pubescent on the inner surface. Corolla tube 12-23 mm long, 1.1-1.4 times as long as calyx, 0.8-1.4 times lobe length, glabrous or sparsely pubescent at top of tube outside, densely pubescent inside; lobes 12-38 by 6-14 mm, 2-2.7 times as long as wide, oblique obovate, glabrous outside and inside. Stamens inserted at 5-5.5 mm from corolla base which is 0.3-0.5 of tube length; anthers 5-6.6 by 1.1-1.7 mm, 2.9-6 times as long as wide. Disk a 5-crenate ring, 0.7-1.6 mm high. Ovaries 1.2 mm high, glabrous; style 5 mm long, glabrous; style head 2 mm long. Fruit unknown.
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