Shrubs, 2–3 m tall; older branches grayish, bark falling off in flakes; young shoots usually shortly glandular-hairy. Petiole flat, usually narrowly winged, 5–30 mm; leaf blade leathery, obovate-elliptic to elliptic, sometimes fiddle-shaped, 5–12 × 2–5 cm; base cuneate to rounded; apex obtuse, apiculate to retuse; abaxial surface pale green, glabrous except near midrib; adaxial surface deep green, glabrous; midrib raised abaxially, flat adaxially; lateral veins 9–12-paired, conspicuous abaxially. Inflorescence 5–10-flowered; rachis 5–12 mm, glabrous. Pedicel 1–2 cm, glabrous; calyx cupular; lobes 5, 7–10 mm, unequal in size; corolla tubular-campanulate, white, rose to deep crimson, or rarely yellowish, 3.5–5 cm, lobes 5, suborbicular, ca. 1.5 × 2 cm, emarginate; stamens 10, unequal, 1.8–3 cm, filaments pubescent at base; ovary cylindric-ovoid, ca. 5 mm, densely glandular-hairy; style ca. 3 cm, glabrous. Capsule ca. 12 × 6 mm, glaucous, base enclosed by persistent calyx.
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