Tarim Basin lies between Tianshan mountain and Chuenluen mountain it is situated at latitude 37°～42°N. It is located on warm-temperate zone

its natural environment is very distinctive. Distribution of vegetation is special. It looks closely contract

the elements of the flora are very poor

seeded plants of Tarim Basin. flora consisted of 35 families

ic5 genera

165 species.Among them

8 families belong to tropical elements

but most of them belong to temperate elements. There are some endemic species in the region. In the flora

the most important are hemicryptophytes

and the second place are therophytes

it shows the vegetation having the special character of temperate zone desert in the region. Tarim Basin flora fromed in Tertiary Period

and originated from cathaysian flora

the latter spread to the region

was elected and differentiated. Among the elements of the flora

some of them formed in the desert environment of Tarim Basin

another came from Tethys-Anngla flora

and didn't come from central Asia. Tarim Basin flora not only had Tertiary Period spotes but also Quaternary species. The desert flora formed in Tertiary Period

for climate became dry further

variation of species produced further too.