西藏杜鹃 xi zang du juan

Small trees or shrubs, 2–5 m tall; branchlets stout, glabrous. Petiole cylindric, 20–30 mm, glabrous; leaf blade thickly leathery, elliptic or oblong-elliptic, 13–17 × 4–6 cm; base rounded, asymmetrical; apex obtuse or acuminate; both surfaces glabrous; abaxial surface pale green; adaxial surface deep green; midrib conspicuous, raised abaxially, flat or slightly impressed adaxially; lateral veins 16–20-paired. Inflorescence racemose-umbellate, 2- or 3-flowered; rachis 5–7 mm, glabrous. Pedicel stout, 1.5–2 cm, glabrous; calyx cupular; lobes 5, 5–7 mm, rounded, glabrous; corolla campanulate or funnel-campanulate, deep rose, 5.5–7 cm, base with 5 deep purple nectar pouches; lobes 5, orbicular, 2–2.5 cm in diam., emarginate; stamens 12, unequal, 2.5–3.5 cm, filaments glabrous or puberulent at base; ovary ovoid, 5–7 mm, glandular, densely setose; style 5–6 cm, setose and glandular at base; stigma swollen. Capsule not known. Fl. Mar–Apr.

Mixed forests, valleys, stream banks; 1800–2200 m. SE Xizang.