Preliminary analysis of xerophyte flora geographical elements of the Russian Caucasus semidesert regions

The article gives information on the geographic distribution of species, as well as the data on the geographical and linking xerophytic flora geoelements of the Russian Caucasus semidesert regions. The xerophytic flora of the Russian Caucasus semidesert areas is the boreal-mediterranean according to the geoelement dominant groups. The significant part of boreal species are Pontian and Pontian-South-Siberian species, and among ancient mediterranean these are Turan and general ancient Mediterranean species. The Pontian, Pontian-South-Siberian and Subturan species are represented by the highest number of geoelements.