圆头杜鹃 yuan tou du juan

Small trees or shrubs; branches stout, 8–10 mm in diam. below inflorescence, grayish tomentose. Petiole flattened and winged, 10–15 mm, tomentose; leaf blade leathery, obovate-elliptic or narrowly oblanceolate, broadest above middle, 17–24 × 5–9.5 cm; base cuneate, decurrent; apex rounded, apiculate; abaxial surface with whitish to buff, 2-layered indumentum, upper layer of narrowly cup-shaped hairs, lower layer compacted and thin; adaxial surface green, glabrous; midrib flat or grooved adaxially; lateral veins 13–15-paired. Inflorescence racemose-umbellate, 15–20-flowered; rachis stout, 20–30 mm, tomentose. Pedicel 3–4 cm, brown tomentose; calyx lobes 8, 1–2 mm, triangular; corolla obliquely campanulate, white to pink, with a purple basal blotch, 4.5–5 cm, lobes 8, suborbicular, ca. 1 × 1.5 cm, emarginate; stamens 16, 2–3 cm, filaments puberulous at base; ovary conoid, ca. 10 × 6 mm, densely brownish tomentose; style ca. 2.5 cm, glabrous. Capsule 25–35 × ca. 10 mm, densely tomentose. Fl. May–Jun, fr. Sep–Oct.

Pinus or Rhododendron forests; 3500–3900 m. SE Xizang, NW Yunnan.