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4. Rhododendron subg. Rhodorastrum (Maximowicz) C. B. Clarke in J. D. Hooker, Fl. Brit. India. 3: 474. 1882.

迎红杜鹃亚属 ying hong du juan ya shu

Fang Ruizheng (方瑞征 Fang Rhui-cheng); David F. Chamberlain

Rhododendron sect. Rhodorastrum Maximowicz, Mém. Acad. Imp. Sci. Saint Pétersbourg, Sér. 7, 16(9): 15, 43. 1870.

Small to medium shrubs, deciduous or semievergreen; new foliage shoots from axils of leaves below inflorescence buds; young shoots scaly. Leaf blade with abaxial surface scaly, scales 4 × their own diameter apart. Inflorescence axillary or subterminal, 1-flowered. Calyx poorly developed, 0.5–1 mm; corolla widely funnelform, light red to purple, seldom white, outer surface generally without scales, only rarely scaly, shortly pilose. Stamens 10; filaments pilose below; ovary 5-locular, densely scaly, otherwise glabrous; style slender, straight, glabrous. Capsule small, oblong. Seed wingless.

Two species: China, Japan, Korea, Mongolia, Russia; two species in China.

Cullen (Notes Roy. Bot. Gard. Edinburgh 39: 111. 1980) treated Rhododendron subg. Rhodorastrum as R. subsect. Rhodorastrum (Maximowicz) Cullen within R. sect. Rhododendron.


1 Semievergreen; leaf apex rounded, adaxial surface with scales overlapping to 1.5 × their own diameter apart; corolla 1.3–2.3 cm.   201 Rhododendron dauricum
+ Deciduous; leaf apex acute, acuminate, rarely obtuse, adaxial surface with scales 2–4 × their own diameter apart; corolla 2.3–2.8 cm.   202 Rhododendron mucronulatum

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