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 overlapping to 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.