(2000)  
 
Another Japanese variety R. multiflora var. adenochaeta was separated from its mother species (R. multiflora). R. multiflora var. adenochaeta has a limited distribution in Kyushu regions of Japan and it has many pink-white flowers clustered in a panicle. In particular, its pedicels and calyx tube are prominently covered with red stipitate glands which is quite different from its mother species. We suppose that R. multiflora var. adenochaeta should be treated as one separate species and be restored to the original name as R. adenochaeta Koidz. Analysis with ITS+matK sequence data also supports our results.

(2000)  
 
R. luciae and its 4 varieties (R. luciae var. fujisanensis, R. luciae var. onoei, R. luciae var. hakonensis and R. luciae var. paniculigera) formed one clade that is consistent with their similar morphological characters. In this clade, R. luciae and its 2 varieties (R. luciae var. fujisanensis and R. luciae var. onoei) showed a closer relationship, while R. luciae var. hakonensis and R. luciae var. paniculigera are reluctantly separated from them.

(2000)  
 
R. luciae and its 4 varieties (R. luciae var. fujisanensis, R. luicae var. onoei, R. luciae var. hakonensis and R. luciae var. paniculigera) formed one clade that is consistent with their similar morphological characters. In this clade, R. luciae and its 2 varieties (R. luciae var. fujisanensis and R. luciae var. onoei) showed a closer relationship, while R. luciae var. hakonensis and R. luciae var. paniculigera are reluctantly separated from them.

(2000)  
 
R. luciae and its 4 varieties (R. luciae var. fujisanensis, R. luicae var. onoei, R. luciae var. hakonensis and R. luciae var. paniculigera) formed one clade that is consistent with their similar morphological characters. In this clade, R. luciae and its 2 varieties (R. luciae var. fujisanensis and R. luciae var. onoei) showed a closer relationship, while R. luciae var. hakonensis and R. luciae var. paniculigera are reluctantly separated from them.

(2000)  
 
R. luciae and its 4 varieties (R. luciae var. fujisanensis, R. luicae var. onoei, R. luciae var. hakonensis and R. luciae var. paniculigera) formed one clade that is consistent with their similar morphological characters. In this clade, R. luciae and its 2 varieties (R. luciae var. fujisanensis and R. luciae var. onoei) showed a closer relationship, while R. luciae var. hakonensis and R. luciae var. paniculigera are reluctantly separated from them.

(2000)  
 
R. luciae and its 4 varieties (R. luciae var. fujisanensis, R. luicae var. onoei, R. luciae var. hakonensis and R. luciae var. paniculigera) formed one clade that is consistent with their similar morphological characters. In this clade, R. luciae and its 2 varieties (R. luciae var. fujisanensis and R. luciae var. onoei) showed a closer relationship, while R. luciae var. hakonensis and R. luciae var. paniculigera are reluctantly separated from them.