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

238. Rhododendron sidereum I. B. Balfour, Notes Roy. Bot. Gard. Edinburgh. 12: 162. 1920.

银灰杜鹃 yin hui du juan

Shrubs or small trees, 3–10 m tall; branchlets and petioles with gray-white agglutinated indumentum when young, glabrescent. Petiole 15–25 mm; leaf blade leathery, narrowly oblong to oblong-lanceolate, 9–21 × 3.5–6.5 cm; base broadly cuneate or rounded; margin slightly revolute; apex obtuse or acute and apiculate; abaxial surface indumentum silvery-gray, thin, agglutinated, glabrous on midrib; adaxial surface dark-punctate, glabrous but with vestiges of juvenile hairs in midrib; midrib prominent abaxially, grooved adaxially. Inflorescence racemose-umbellate, 14–20-flowered; rachis 50–60 mm. Pedicel 1.5–3 cm, densely pale brown-tomentose; calyx oblique; teeth 8, ca. 1 mm, triangular, tomentose; corolla ventricose-campanulate, creamy-white to pale yellow, 3.5–4 cm, with crimson nectar pouches at base inside, lobes 8; stamens 16, unequal, filaments pubescent at base; ovary ca. 8 mm, densely fawn-tomentose, eglandular; style glabrous and slightly shorter than corolla but longer than stamens; stigma large and discoid. Capsule cylindric, oblique at base, 25–30 × 8–10 mm, ± fawn-tomentose. Fl. Apr–May, fr. Jul–Sep.

Mixed forests on mountain slopes; 2400–3400 m. W Yunnan [NW Myanmar].


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