The element of Tethys is very important in the flora of Tsaidam Basin. Since the regression of Tethys and the rising of elevation

the Climate of environment had become dry and cold

it has formed in this locality. identically

the element of Central Asia is a part of Tethys flora too. The element of temperate in this flora was formed by Cathayslan flora

and connected with Angola flora. The element of Himalaya was formed in this locality

It is the J bungest nelnber in this flora

indubltatlvely. it is the descendants of cathaysian flora. The being of the element of Endemic to China special properties of this flora.Although the flora in Tsaidam Basin

had undergone from aridity to moisture and from moisture to aridity

exchanging repeatedly

there are many evidences of pollen

which fully prove: the xerophytic flora from modern Tsaidarn Basin had formed in Quaternary

and was controled straight by the dry and cold climate.