A floristic analysis of the seed plants in the middle area of south slope of Qinling Mountains

There are 2 184 species seed plants belong to 815 genera in 152 families in the middle area of south slope of Qinling Mountain.Based on the statistics and analysis the results were as follows:(1) It is richer in number of seed plants which include 5 families,15 genera and 30 species of gymnosperms;23 families,169 genera and 390 species of monocotyledon;124 families,631 genera and 1 764 species of dicotyledon.(2) There are 15 areal type of genera of seed plants and 19 subtype in this region.It has 64.17% of various temperate areal type and 30.34% of tropical elements.So that,it is chiefly temperate in nature and certain transional nature with tropical and subtropical in this flora.(3) There are large proportion of archaic,relic and primitive plants in this area.This result shows clearly the ancient nature of this flora.(4) There are 41 genera Chinese endemic genera of seed plants and 32 species rare endangered plant.These analysis results showed that this region is an important composition of Qinling Mountain plant flora.