Large spreading tree to c. 15 m high. Lvs with long petioles. Lamina to c. 25 × 20 cm on flowering shoots, ovate, glandular-hairy above, densely glandular-hairy below and with some hairs stellate, at least when young, entire or toothed (usually shallowly 3-5-lobed on young trees); base cordate; apex acute or acuminate. Panicle erect, pyramidal; branches and calyx rusty brown; tomentose; fl. buds produced in the previous summer. Calyx 1.5-2 cm long, campanulate; lobes obtuse. Corolla 5-7 cm long, glandular-hairy outside; tube campanulate-funnelform, sharply bent near base, mauve with white or yellowish throat, sometimes with dark streaks; lobes c. 1.5 cm broad, ± rounded, glandular-ciliate. Capsule 3.5-4.5 cm long including beak, ovoid. Seed fusiform; wing striate.