Analysis on Flora of Seed Plants in Hanniu River of Sichuan Province

There were 357 species of seed plants that belong to 79 families and 240 genera,including two kinds of rare or endangered species in Hanniu River of Sichuan Province.The river's flora could be divided into 15 distribution types and 10 subtypes,dominated by the north temperate.The river's flora was characterized by diversified geographical elements,ancient origin,transitional characters from tropical and sub-tropical to temperate and a certain proportion of cosmopolitan species and species endemic to China.