North American floristic region covers almost all area of North America, except southern and northern part of continent. Sometimes is classified into other sub areas (North Atlantic, South Atlantic, North Pacific and South Pacific). Flora is really rich here, these area has 6 endemic families altogether. Share of endemic species is high – is approaching to the 50 %. Northern vegetation is influenced by Subarctic and slightly by Arctic. Southern parts of this area are then species-richer, with higher amount of endemic species. Development is influenced by Asian tropics and partially by the Neotropis area.

North American