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

188. Rhododendron caesium Hutchinson, Gard. Chron., ser. 3. 94: 102. 1933.

蓝灰糙毛杜鹃 lan hui cao mao du juan

Shrubs, semievergreen, 1–1.5 m tall; young growth sparsely scaly, otherwise glabrous; bud scales deciduous. Petiole 2–6 mm, scaly, setose; leaf blade leathery, oblong, oblong-lanceolate, elliptic to oblong-ovate, 2.5–4(–6) × 1.2–2(3.4) cm; base rounded; margin slightly revolute, long-setose; apex rounded, mucronate; abaxial surface glaucous, scales 2–5 × their own diameter apart, unequal, brown, midrib setose; adaxial surface pale bluish green, glabrous. Inflorescence (1–)2–3(–5)-flowered. Pedicel 1–1.5(–2) cm, scaly; calyx lobes 1–2 mm, rounded to ovate, persistent in fruit, scaly, margin sparsely setose; corolla funnelform-campanulate, yellow or yellowish green, with greenish spots, 1.5–2(–2.5) cm; tube 7–10(–12) mm; outer surface scaly, without hairs; stamens 10, filaments pubescent towards base; ovary scaly; style slender, straight, nearly as long as corolla. Capsule cylindric, ca. 10 mm, densely scaly. Fl. May, fr. Jun.

Rocky slopes, valleys; 2400–3100 m. C and W Yunnan.


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