Discussion of the basic characteristic of the flora of Henan province

Henan province locates in the eastern-central part of China, transitional zone from temperate to subtropic, from humid to semihumid and semarid, ranging from longitude 110°21′to 116°39′E , latitude 31°23′to 36°22 ′N. The Central China, North China and East China plant Regions connect in here, so its floristic elements are complex .This paper summarizes and discuses the characteristic of the flora of Henan province based on the latest floristic data. The result is as follows: (1)it is rich in flora; (2)there are many families and genera being age-old in origin in it; (3)its geographical elements are complex, but temperate type is the dominant and the character of transition conspicuous in the flora; (4)it is rich in species endemic to chine, ranking the first place in the northern areas in China; (5)the difference between areas is obvious.