Description from Flora of China
Shrubs or small trees, 1–6 m tall; young shoots greenish, glabrous. Petiole 12–40 mm, glabrous; leaf blade thickly leathery, oblong, oblong-ovate or oblong-elliptic, 5–19(–30) × 3–11 cm; base cordate or cuneate to nearly rounded; apex obtuse, rounded, apiculate; both surfaces glabrous when mature; abaxial surface pale green; adaxial surface deep green, midrib prominent abaxially, grooved adaxially; lateral veins 18-paired. Inflorescence 8–10-flowered; rachis 20–25 mm, sparsely glandular. Pedicel stout, 2.5–4 cm, glandular-hairy; calyx lobes 5, 1.5–2.5 mm, glandular-hairy; corolla funnel-campanulate, fragrant, white to pale pink, 3–10 × 5–9 cm, outer surface sparsely glandular, inner surface puberulent at base; lobes 6–8, suborbicular, ca. 2 × 2.4 cm, emarginate or entire; stamens 13–16, unequal, 2–3 cm, filaments pubescent at base; ovary cylindric, ca. 6 mm, densely glandular-hairy; style 3.4–4 cm, with similar glands to tip; stigma 2–5(–6.5) mm in diam. Capsule oblong, usually slightly curved, 25–40 × 10–15 mm. Fl. Apr–Jun, fr. Sep–Oct.
Forests, thickets; 1000–3300 m. W Guizhou, SW Sichuan, SE Xizang, Yunnan [Myanmar].