A Numerical Taxonomic Study on Morphological Characters of Populus tomentosa and Its Relative Species

In this paper, 4 similarity coefficients and 9 cluster methods are used to analyse 26 types of Populus tomentosa Carr. and 5 relative species (include variety), besides, 26 characters are presented. According to the dendrogram, varieties of P. tomentosa were grouped into 9 groups. In addition, based on the comparison of 5 relative species, we consider P. davidiana Dode and P. alba L. var. pyramidalis Bge. may take part in the formation of some natural types of P. tomentosa.