Taxonomic biodiversity of flora of North of Truong Son

In this paper some preliminary resaults on diversity of of flora of North of Truong Son are report with 4133 species, 1211 genera and 224 families of 6 dicvisions of vascular plant. The index of families is 18.45; index of genera is 3.41 and the main genera for each family is 5.41. There are 28 families, what is most diverse with total of 57.39% of species and 51.1% of genera. 22 rich-species genera of this flora has of total 635 species.