Shrub 2-3-(6) m tall, glabrous except for fls. Petiole to 4-7 cm long, slender, unwinged. Lamina 3-8-(14) × 1-4-(9.5) cm (sometimes much larger in cultivation and on basal vegetative shoots), ovate-lanceolate, elliptic or obovate; base cuneate; apex acute or short-acuminate. Panicle open; fls to c. 20, not fragrant. Calyx 1-1.3 cm long; teeth 3-5 mm long, equal, triangular-acuminate, ciliate. Corolla 3.5-4 cm long, tubular, densely puberulent outside, yellow; lobes very shallow, c. 3 mm long, not reflexed, apiculate. Capsule c. 1 cm long, broadly ellipsoid. Seed 0.5-0.75 mm long, oblong, rugosely reticulate.