Abstract: There are 2540 species in 1026 genera and 207 families of seed plants in Mt.Wuliangshan which is located in the south-central part of Yunnan province, southwest China. We have obtained a complete composition of this flora by ranking of the families and genera accord- ing to the absolute numbers of species comprised in them. It is a traditional approach by which it is difficult to reflect the relative importance of such families and genera in its floristic composition. VFP (Value of Floristic Presence), that is, the ratio of the number of the secondary taxa occurring in this place to that in all the world, has been put forward. Then based on VFP arranging them, we can get a rather different rank, in which few large families of absolutely large numbers of species can be found. On the contrary, some small families endemic to East Asia or distributed mainly in it and adjacent regions have higher VFP because of having relatively many genera in this place and can represent the characteristics of this concrete flora.

Key words: Ranking, Value of floristic presence, Flora of seedplants, Mt.Wulianshan