Study on the north temperate of the seed plant in Qinling Mt.

The north temperate of the seed plant flora in Qinling Mt. is studied in this paper. The result shows: the north temperate is a dominant element of the composition of the seed plant flora in Qinling Mt., there are 225 genera in this range, the amount of genera about north temperate account for 24.08% of the total genera in Qinling Mt. and 74.50% of the north temperate of China seed plant flora. The north temperate in this Mt. is not only rich in kind, but also the dominant element in the flora of the vegetation .The nature of the flora is temperate characteristics, and the origin of north temperate has the clear tropical nature.