Trees or shrubs up to 15 m tall; branchlets pilosulous, or puberulous or rarely glabrescent. Leaves with blades elliptic, elliptic-oblong, lance-elliptic, or ovate, 6-19 x 2-11 cm, drying chartaceous, pilosulous to puberulous or glabrescent, at base cuneate to acute, at apex rounded to obtuse or shortly acute; secondary veins 7-10 pairs, with domatia in the form of small pits or these sometimes reduced; petioles 0.5-3 cm long, puberulous to hirtellous or often glabrescent; stipules obovate to ligulate, 1.0-2.1 cm long, variously pubescent or rarely glabrescent, at apex subacute to usually broadly rounded. Inflorescences 5-20 x 5-20 cm. Flowers with hypanthium 1.8-3.3 mm long, puberulous to glabrescent; calyx limb 0.8-3 mm long, lobed for up to 1/3 of its length, the lobes triangular, acute to rounded; corolla salverform, white or usually pink to purple, outside pilosulous or strigillose or glabrescent, inside glabrous or pubescent in throat and on lobes, tube 8-13 mm long, lobes triangular, 3.5-6.3 mm long, acute; anthers 2.5-5.3 mm long; stigmas 1.7-4 mm long. Fruits capsular, narrowly ellipsoid to nearly cylindrical or sometimes lanceoloid (i.e., widest below the middle), 5-31 x 3-8 mm, stiffly papery, dehiscent from the base (or sometimes immature capsules opening prematurely also from the apex); seeds 3.3-10 x 1.5-3.5 mm, flattened, small, irregularly elliptic to oblong, marginally winged and often irregularly incised or erose.