R. Pallasii. W. Asia. 
R. rupestris. S.C. Eu. 
R. saxatilis. Rock B.; C. and S. Eu. 
RHODODENDRON, Ericaceae. Evergreen or deciduous 
shrubs, many of which are especially valued for garden deco¬ 
ration. They vary from a little more than one foot to twenty 
feet in height. With a few notable exceptions the hybrids and 
varieties are more popular than the species, partly because 
many of the latter are not entirely suited to this climate and 
also because too few growers have been willing to experiment 
with their cultivation. They require acid soil. Many flower 
satisfactorily when grown in full sun but the foliage is more 
attractive in light shade. The lace bug is one of the worst pests 
of rhododendrons and must be promptly controlled. This large 
genus includes Azalea, many forms of which are deciduous. 
The following species, varieties, and clones are evergreen [8E, 
5C, 4B, nursery]. 
R. altaicum. Altai Mts. 
R. arbutifolium (R. ferrugineum x minus). 
R. Augustini. C. and W. China. 
R. brachycarpum. Japan, Korea (Jn.). 
R. calophytum. W. China. 
R. campanulatum. Sikkim, Nepal. 
R. carolinianum. N. C. (My.-Jn.). 
R. c. album. N. C. 
R. catawbiense. Mountain Rose-bay; Va. to Ga. (My.-Jn.). 
R. c. album. 
R. c. “Boursault.” 
R. c. grandiflorum. 
R. caucasicum. Cauc. (My.). 
R. c. ochroleucum. 
R. charianthum. W. China. 
R. cinnabarinum. Himal. 
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