335. Rhododendron hunnewellianum Rehder & E. H. Wilson in Sargent, Pl. Wilson. 1: 535. 1913.
岷江杜鹃 min jiang du juan
Shrubs, 2–5 m tall; branchlets stout, 4–5 mm in diam. below inflorescence, at first grayish tomentose, glabrescent. Petiole grooved adaxially, 10–15 mm, puberulent at first, glabrescent; leaf blade leathery, narrowly lanceolate, or narrowly oblanceolate, 7–13 × 1.5–2.8 cm; base cuneate; margin slightly reflexed; apex acuminate; abaxial surface with indumentum 2-layered, initially white, sometimes becoming tawny or grayish with age, upper layer forming a loose woolly surface; lower layer compacted and whitish; adaxial surface green, glabrescent, midrib conspicuous, prominent abaxially, deeply grooved adaxially; lateral veins 15–20-paired, inconspicuous. Inflorescence 3–7-flowered; rachis 5–10 mm, pubescent. Pedicel 1–2 cm, sparsely tomentose and shortly glandular-hairy; calyx discoid, small, glandular-ciliate; corolla widely campanulate, white, pale rose or purple, deeper in bud, pink-spotted within, 3–5 cm, densely puberulent below within; lobes 5, orbicular; stamens 10, unequal, 2–3.5 cm, filaments pubescent at base; ovary conoid, ca. 7 mm, densely whitish tomentose; style 4–4.2 cm, with a little tomentum and sometimes with a few glands at base, otherwise glabrous. Capsule oblong cylindric, 20–25 × ca. 6 mm, brown tomentose. Fl. Apr–May, fr. Jul–Sep.
Woodlands, thickets, valleys along the Min Jiang, mountain slopes; 1200–2400 m. S Gansu, C and N Sichuan.