雷山杜鹃 lei shan du juan

Shrubs, ca. 3 m tall; bark gray, dehiscent on drying; branchlets terete, 3–4 mm in diam., setose when young, gradually glabrescent; bud scales membranous, long-ovate, 1–1.5 × 0.5–0.7 cm, apex rounded or with short cusp, with yellowish hairs on outer surface, inner surface glabrous. Petiole rounded abaxially, furrowed adaxially, 5–12 mm, densely setose; leaf blade thickly leathery, elliptic or obovate, 4–6 × 2.5–3 cm; base rounded or subcordate; apex rounded; abaxial surface deep green, with small projections, glabrous or sometimes sparsely hairy on midrib; adaxial surface flat, sparsely glandular; midrib impressed abaxially, lateral veins 11–15-paired, inconspicuous on both sides. Inflorescence racemose-umbellate, 3–5-flowered; rachis 5–7 mm, tomentose. Pedicel ca. 1 cm, densely setose-tomentose; calyx discoid; lobes 5, ca. 2 mm; corolla campanulate, purple-red, with deep purple-red spots, 3–3.5 cm, lobes 5, suborbicular, ca. 1.5 cm; apex emarginate; stamens 10, unequal, 1–2 cm, filaments broader and glabrous at base; ovary cone-shaped, ca. 5 mm, densely setose and tomentose; style 2.5–3 cm, glabrous, stigma slightly expanded. Capsule not known. Fl. Apr.

Mixed forests, mountain slopes; 1800–1900 m. E Guizhou.