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

303. Rhododendron araiophyllum I. B. Balfour & W. W. Smith, Trans. Bot. Soc. Edinburgh. 27: 184. 1917.

窄叶杜鹃 zhai ye du juan

Shrubs, 2–7 m tall, older branches glabrous; branchlets slender; young shoots glabrescent. Petiole cylindric, ca. 10 mm, glabrescent; leaf blade subleathery, elliptic-lanceolate or narrowly lanceolate, broadest above middle of blade, 5–11 × 1.3–3 cm; base cuneate; margin undulate; apex acuminate or cuspidate; abaxial surface glabrous except sometimes for densely woolly midrib; adaxial surface glabrous, midrib conspicuously raised abaxially, grooved adaxially; lateral nerves 15–16-paired, obscure. Inflorescence racemose-umbellate, 5–10-flowered; rachis slender, 10–15 mm, woolly. Pedicel 1–1.5 cm, sparsely woolly; calyx lobes 5, 1–2 mm, rounded, glabrous to sparsely ciliate; corolla open-campanulate, fleshy, milky white to rose, with basal blotch, sometimes with purple flecks, 2.5–3.5 cm; lobes 5(or 6), suborbicular, ca. 1.3 × 1.5 cm, emarginate; stamens 10–12, 1.4–2.8 cm, filaments slender, pubescent at base; ovary conoid-cylindric, 5–6 × ca. 2.5 mm, 5- or 6-locular, pubescent at base; style glabrous, stigma slightly swollen. Capsule oblong-cylindric, 10–15 × ca. 4 mm, glabrous. Fl. Apr–May, fr. Oct–Nov.

Pinus forest margins, thickets; 1900–3400 m. NE and W Yunnan [NE Myanmar].


1 Leaf blade elliptic-lanceolate, 5–11 × 2–3 cm; abaxial surface with woolly-tomentose midrib.   303a subsp. araiophyllum
+ Leaf blade narrowly lanceolate, 5.5–7.5 × 1.3–1.7 cm; abaxial surface entirely glabrous.   303b subsp. lapidosum

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