铜色杜鹃 tong se du juan

Shrubs, 1–2 m tall; older branches pale gray-brown; bark exfoliating into thin and small irregular flakes; young shoots slender, smooth, glabrous. Petiole 12–20 mm, glandular, later smooth; leaf blade leathery, obovate or suborbicular, 4–7 × 3–5 cm; base cordate or suborbicular; apex obtuse, apiculate; abaxial surface glaucous, with scattered viscid glands; adaxial surface deep green, glabrous; midrib prominently raised abaxially, grooved adaxially; lateral veins 12–16-paired, flat on both surfaces, obscure. Inflorescence racemose-umbellate, 1- or 2-flowered; rachis 1–3 mm, puberulent or glabrous. Pedicel ca. 1 cm, glandular-hairy; calyx pale green to pink, cupular; lobes 5, 5–7 mm, ovate or rounded, glabrous, fringed with stalked glands; corolla tubular-campanulate, fleshy, coppery-red or pink, with dark flecks, 3.5–4 cm, nectar pouches present; lobes 5, ca. 1.5 × 2.5 cm, emarginate; stamens 10, unequal, 1.5–3 cm, filaments glabrous; ovary cylindric, ca. 6 × 3 mm, densely tomentose and shortly glandular-hairy; style 2.5–3 cm, glabrous; stigma slightly swollen. Capsule cylindric, ca. 20 × 9 mm, tomentose, base enclosed by persistent calyx. Fl. May.

Valleys, stream banks; 2700–3300 m. SE Xizang.