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FOC | Family List | FOC Vol. 14 | Ericaceae | Rhododendron

392. Rhododendron pronum Tagg & Forrest, Notes Roy. Bot. Gard. Edinburgh. 15: 318. 1927.

平卧杜鹃 ping wo du juan

Prostrate shrubs, 0.1–0.5 m tall; bud scales persistent. Petiole ca. 5 mm, glabrous; leaf blade thickly leathery, oblong-elliptic to oblanceolate, 3–6.5 × 1–2 cm; base cuneate; margin strongly revolute; apex obtuse to acute with small and downward curved sharp point; abaxial surface with indumentum 2-layered, upper layer dark gray to fawn, thick and loose, woolly, hairs branched, lower layer compacted and gray-white; adaxial surface slightly rugulose, glabrous. Inflorescence racemose-umbellate, 6–12-flowered, surrounded by persistent perulae and bracts; rachis ca. 3 mm. Pedicel 1.5–2.5 cm, sparsely floccose or glabrescent; calyx lobes 5, ca. 2 mm, obtusely triangular, glabrous or sparsely floccose; corolla campanulate, pale yellow to creamy-white, with deep crimson spots on corolla tube on upper lobes, 3–3.5 × ca. 3.5 cm; lobes 5, slightly unequal, subrounded; stamens 10, filaments glabrous; ovary and style glabrous; style shorter than corolla, glabrous; stigma discoid. Capsule cylindric, blackish, ca. 10 × 4–5 mm, glabrous. Fl. Jun, fr. Sep–Oct.

Mountains, moist rocky slopes, stony streamsides; 2600–4400 m. NW Yunnan.


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