黑竹沟杜鹃 hei zhu gou du juan

Shrubs, 3–5 m tall; branchlets glabrous. Petiole 10–15 mm, densely tomentose; leaf blade thickly leathery, broadly elliptic to oblong-elliptic, 10.5–18 × 5.5–8 cm; base auriculate-cordate; apex acute and mucronate; abaxial surface yellow-green to brownish, indumentum thin, 1-layered, hairs radiate; adaxial surface deep green, glabrous. Inflorescence racemose-umbellate, 15–23-flowered; rachis ca. 15 mm, puberulent. Pedicel 2.5–3.5 cm, sparsely puberulent; calyx obsolete; corolla broadly campanulate, pale yellow, purple-flecked on one lobe at base, 4.4–5.2 × ca. 4 cm; lobes 5; stamens 10, unequal, filaments flattened, puberulent at base; ovary conical, ca. 6 mm, densely white-tomentose; style 3–3.5 cm, glabrous, stigma capitate, brown. Fl. Jun.

Abies forests, mountains; ca. 3300 m. W Sichuan.