高山白花杜鹃 gao shan bai hua du juan

Shrubs ca. 0.1 m tall; bark brown, usually falling off in flakes; branches 3–4 mm in diam. below inflorescence, setose; bud scales persistent. Petiole with decurrent wing, 4–10 mm, glabrescent; leaf blade obovate or widely oblanceolate, 4–8.5 × 1.5–3 cm; base cuneate; margin revolute; apex obtuse, apiculate; abaxial surface indumentum discontinuous, rufous; adaxial surface dark green, clearly rugose, glabrescent; midrib grooved adaxially; lateral veins 7–9-paired, impressed adaxially. Inflorescence lax, umbellate, 4–6-flowered, rachis ca. 4 mm, tomentose. Pedicel 1.5–1.8 cm, glandular-setose; calyx lobes 5, 2–3 (–8) mm, elliptic, ciliate; corolla tubular-campanulate, white, 3–3.5 cm, lobes 5, suborbicular, ca. 1.2 × 1.5 cm, emarginate; stamens 10, unequal, 1.5–2 cm, filaments glabrous; ovary ovoid, with truncate apex, ca. 5 mm, rufous-tomentose; style ca. 2 cm, glabrous; stigma capitate, small. Capsule not known. Fl. Jul.

Grasslands, rocky slopes, alpine regions; 3900–4400 m. W Yunnan [NE Myanmar].