Study on Wetland Spermatophyte Constituent and Floristic in Xunbielahe Drainage Basin

There are 461 species of seed plants in Xunbielahe drainage basin,belonging to 218 genera and 71 families;the largest family is Compositae,next family are Ranunculaceae,Gramineae,Cyperaceae.At family level,besides cosmopolitan family,the temperate type is the main elements.At genus level,the geographical component is mainly the north temperate type(containing variety),containing 102 genera,and occupying 62.04% of the total number of genera.At species level,the geographical component is mainly temperate floristic elements(74.15%) in this flora.The basic characteristics of the flora are follows: Dominant family is prominent in this flora;The genera with single species and few species occupied high percentage of the total number;The flora is various in floristic elements.