Liana, branchlets more or less subtetragonal with the wrinkled surface form-ing longitudinal ridges when dry, the epidermis finely and regularly papillate with scattered lepidote scales and sometimes a minute puberulence at the nodes, the nodes without interpetiolar glandular fields or pseudostipules. Leaves 2-foli-olate with a tendril or tendril scar; leaflets ovate, obtuse, short acuminate, basally truncate 5.9-11 cm long and 2.8-5.3 cm wide, coriaceous to chartaceous, the margins revolute, the epidermis regularly and densely papillose with scattered lepidote punctations, the smaller veinlets obscure, glabrous above and beneath to rarely minutely puberulent at the base of the midvein beneath, green to olive above, light green to yellowish beneath, the petiolules 0.6-1.3 cm long, the petiole 1.2-2.5 cm long; tendril usually trifid, rarely simple, 3-12 cm long to branching, the 3 arms 0.4-1.0 cm long. Inflorescence an axillary one to few-flowered raceme with opposite flowers. Flowers with the calyx cupular, glabrous, truncate, eglan-dular, 5-8 cm long and 7-9 cm wide; corolla yellow, tubular-campanulate above the narrowed tubular base, 5-7.5 cm long and 1.7-1.9 cm wide at the mouth of tube, the tube 3.8-5.3 cm long, the lobes 0.8-1.1 cm long, lepidote outside, inside lepidote on the lobes, glandular pubescent below the point of stamen insertion and sparsely so on the lobes; stamens didynamous, the anther thecae divaricate, 3-4 mm long, the longer filaments 1.9-2.1 cm long, the shorter filaments 1.7-1.9 cm long, the staminode 0.7-0.9 cm long, inserted ca. 10 mm from base of corolla tube; pistil 4.0-4.2 cm long, the ovary stipitate, flattened-ovate, 2 mm long, 1-1.5
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mm wide, 0.5 mm thick; disc conspicuous, conical-pulvinate, 1.5 mm long, 2.5 mm wide. Capsule unknown.