Abstract: In the present paper, numerical taxonomy of eight species of the genera Rehmannia and Triaenophora were carried out using 55 morphological, cytological and pollen characters. The principal components analysis (PCA) and UPGMA clustering analysis of NTSYS-pc (version 2.10e) were performed to analyze the Euclidean distance of the relationship of the species in both of the genera for the first time. Our results indicate that Rehmannia and Triaenophora are two distinct groups. All species in this study were separated easily except for Rehmannia elata and R. piasezkii in the dendrogram. The recently reported species Triaenophora shennongjiaensis in the dendrogram was supported as a distinct entity by the numerical taxonomy.

Key words: Numerical taxonomy, Rehmannia, principal components analysis, Triaenophora, UPGMA