Large climber. Leaves with lamina elliptic to slightly oblanceolate, 7–12 cm long, 2.5–5 cm wide, shortly attenuate at base, shortly acuminate at apex, with c. 50 parallel veins on each side of midrib. Inflorescence a dichasial cyme, 5–c. 20-flowered. Calyx tube c. 1 mm long; lobes broadly ovate, c. 1.5 mm long, acute. Corolla yellow; tube c. 5 mm long; lobes contorted, ± orbicular-auriculate, c. 3 mm long, undulate, with 2 small globose scales at base of each lobe. Stamens inserted in lower half of corolla tube; anthers c. 2 mm long. Ovary cylindrical; style head shortly cylindrical; stigma bifid, small, apiculate. Fruit obovoid, 5–6 cm diam., dull grey-green, finely verrucose. Seeds somewhat muricate-bullate.
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