Abstract: In order to study the phylogeny and evolution of genus Rhododendron, we detail six problems as follows; 1. The problems of classification and system of Rhododendron are discussed and the recent articles by H. F. Copeland (1943) , H. A. Seithe (1960, 1980) , M. N. Philipson and W. R. Philipson (1986) are also reviewed. We believe that the system proposed by H. Sleumer (1949) is a natural system. 2. The systematic position of Rhododendron is recognized as a representative original genus in phylogenetic process of the family Ericaceae.

Key words: Rhododendron