Suberect to climbing subshrub, with 4-angled, pilose to glabrescent twigs. Leaves with up to c. 2 cm long petiole; lamina elliptic-ovate to deltoid, 2-5 x 1.5-3.5 (-4) cm, grey-pubescent to glabrate, base truncate to rounded, the margins crenulate to entire, apically acute or shortly acuminate. Flowers in terminal, 1-sided, lax raceme. Bracts lanceolate, 2.5-3 mm long, pilose. Calyx lobes lanceolate, (5-) 7-9 mm long, sparsely pubescent. Corolla yellow to creamy-white with purple streaks on throat, tube up to 2.5 cm long, narrow below, widened to c. 1 cm at the throat, hairy outside, lobes ± orbicular, up to 1.5 cm long. Anthers oblong, 2.5-3 mm long. Style up to 2 cm long. Capsule oblong, up to 2.8 cm long including stipe, pubescent, 4-seeded.