Deciduous climber; vegetative parts glabrous. Young shoots purple. Lvs sessile or shortly petiolate. Lamina 3-7 × 1.5-4 cm, ovate to elliptic or suborbicular, glaucous below, entire; base rounded to cordate or amplexicaul; apex rounded, sometimes mucronate; uppermost pair of lvs (immediately below peduncle) ± connate and amplexicaul, broad-ovate. Fls fragrant; infl. of (1)-2-3 terminal whorls; whorls with up to 15 fls; peduncles from < 0.3 mm to c. 3 cm long. Bracteoles broad-ovate or suborbicular, with or without glands, < ovaries. Calyx lobes 0.5-1.5 mm long, broadly triangular- ovate, sometimes glandular-ciliate. Corolla 4-5 cm long, rose and ± glandular outside, white, becoming yellow within; tube 2.5-3 cm long, narrow; limb 2-lipped, becoming reflexed. Ovaries separate; style > stamens, both exserted. Fr. c. 5 mm diam., globose, orange.