马尔康杜鹃 ma er kang du juan

Shrubs, to 4.5 m tall; young shoots 4–5 mm in diam., sparsely tomentose, glabrescent. Leaf blade leathery, ovate to ovate-oblong, 5.5–8 × 3.8–4.8 cm; base cordate; margin slightly revolute; apex acute and apiculate; abaxial surface thinly pale brown velvety tomentose, hairs radiate; adaxial surface deep green, glabrous. Inflorescence umbellate, 7–8-flowered; rachis ca. 10 mm. Pedicel 0.7–1 cm, sparsely tomentose; calyx lobes 5, ca. 1 mm, glabrous; corolla campanulate, pale yellow, with purple-red spots on upper lobe and purple basal flecks inside, 2.5–3.5 cm, lobes 5, emarginate; stamens 10, unequal, filaments glabrous; ovary and style glabrous; style shorter than corolla and slightly longer than stamens, glabrous; stigma discoid. Fl. Jun.

Thickets on high mountains; ca. 3800 m. NW Sichuan.