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

212. Rhododendron decorum Franchet, Bull. Soc. Bot. France. 33: 230. 1886.

大白杜鹃 da bai du juan

Shrubs or small trees, 1–6 m tall; young shoots greenish, glabrous. Petiole 12–40 mm, glabrous; leaf blade thickly leathery, oblong, oblong-ovate or oblong-elliptic, 5–19(–30) × 3–11 cm; base cordate or cuneate to nearly rounded; apex obtuse, rounded, apiculate; both surfaces glabrous when mature; abaxial surface pale green; adaxial surface deep green, midrib prominent abaxially, grooved adaxially; lateral veins 18-paired. Inflorescence 8–10-flowered; rachis 20–25 mm, sparsely glandular. Pedicel stout, 2.5–4 cm, glandular-hairy; calyx lobes 5, 1.5–2.5 mm, glandular-hairy; corolla funnel-campanulate, fragrant, white to pale pink, 3–10 × 5–9 cm, outer surface sparsely glandular, inner surface puberulent at base; lobes 6–8, suborbicular, ca. 2 × 2.4 cm, emarginate or entire; stamens 13–16, unequal, 2–3 cm, filaments pubescent at base; ovary cylindric, ca. 6 mm, densely glandular-hairy; style 3.4–4 cm, with similar glands to tip; stigma 2–5(–6.5) mm in diam. Capsule oblong, usually slightly curved, 25–40 × 10–15 mm. Fl. Apr–Jun, fr. Sep–Oct.

Forests, thickets; 1000–3300 m. W Guizhou, SW Sichuan, SE Xizang, Yunnan [Myanmar].


1 Leaf blade base cordate; petiole 1.2–1.4 cm.   212d subsp. cordatum
+ Leaf blade base obtuse or rounded; petiole 1.5–4 cm.   (2)
       
2 (1) Stigma small, ca. 2 mm in diam.; corolla lobes 7, entire.   212c subsp. parvistigmatis
+ Stigma swollen, 3–5(–6.5) mm in diam.; corolla lobes 6–8, emarginate.   (3)
       
3 (2) Petiole 1.7–2.3 cm; leaf blade oblong to oblong-obovate, 5–14.5 × 3–5.7 cm; corolla 3–5 cm.   212a subsp. decorum
+ Petiole 2.4–4 cm; leaf blade oblong-elliptic to oblong-oblanceolate, 12–19(–30) × 4.4–11 cm; corolla (6.5–)8–11 cm.   212b subsp. diaprepes

Lower Taxa


 

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Photos by The Biodiversity of the Hengduan Mountains Project  
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  • Image File (Susan Kelley)
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