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

452. Rhododendron hylaeum I. B. Balfour & Farrer, Notes Roy. Bot. Gard. Edinburgh. 13: 265. 1922.

粉果杜鹃 fen guo du juan

Shrubs or small trees, 6–12 m tall; trunk massive, bark slate gray to purplish, smooth when mature; older branches smooth and glabrous; young shoots glandular. Petiole slender, 15–20 mm, glandular-hairy when young, glabrescent; leaf blade leathery, oblong-elliptic to obovate-elliptic, 8–15 × 2.5–3.5 cm; base cuneate to broadly cuneate; apex obtuse, apiculate; abaxial surface glaucous, glabrous; adaxial surface green, glabrous; midrib flat or grooved adaxially; lateral veins 15–18-paired, not conpicuous. Inflorescence racemose-umbellate, 10–12-flowered; rachis 20(–45) mm, glabrous. Pedicel stout, ca. 1 cm, glabrous or glandular; calyx greenish, cupular, fleshy; lobes 5, 3–5 mm, undulate, often deflexed; corolla tubular-campanulate, fleshy, pale rose or pink, with dark flecks, 4–4.5 cm, basal nectar pouches 5; lobes 5, ca. 1.5 × 2.5 cm, emarginate; stamens 10, unequal, 2–3.5 cm, filaments glabrous; ovary cylindric, ca. 6 × 4 mm, glabrous; style glabrous. Capsule 15–20 × 7–8 mm, glaucous, glabrous, calyx usually persistent. Fl. May–Jun, fr. Aug.

Forests, mountain slopes; 2800–3600 m. SE Xizang, NW Yunnan [NE Myanmar].


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