Article

Botanical-geographic diversity of the northeastern part of the Caucasian high mountains was studied. High mountain flora of Pirikiti Khevsureti and Tusheti comprises 595 species, 246 genera and 67 families. 212 species are endemic. They compose 35.3% of the flora on the studied area. Different numbers of endemic species are present in different floristic complexes. Caucasian and Eucaucasian (occurring on the Greater Caucasus) species predominate in the chorological spectrum, which is an indication of the autochthonous nature of the high mountain flora. Besides the endemic species, the presence of elements of the Palearctic (11.4%), Holarctic (10,4%), European (6.4%), Mediterranean (4.0%), Pancontinental (2.4%), Minor Asian (1.2 %), West Asian (0.3%) floras is important.