The aim of our research was to study geograph-ical elements, xerophytes flora of the Russian Cau-casus in connection with the questions of the gene-sis of knowledge. The study was based on field research expeditions, on the territory of the Russian Caucasus. The collection of herbarium material was carried out by a traditional route in combination with the detailed study of the most interesting floris-tic complexes. The main method of floristic data was fixing herbarium collections. In the course of the study the recording environmental observa-tions, height and features phytocenotic species was done. Geographical analysis of the Russian Cau-casus xerophytes flora, numbering 1 018 species of vascular plants was performed. Within the study the area of 6 groups of geoelements was marked as belonging to the highest hierarchical botanical-geographical zoning units. The analysis shows that among geographic elements in the studied flora the vast majority of the flora xerophytes makes boreal geoelement, i.e. 488 species (47.9 %), among them most of the Caucasian geoelements (326 species, 32 % of the total number of species and 66.8 % of boreal geoelements). In the second place are Old Mediterranean geoelements (290 species, 28.5 %), among them the largest number of species is rep-resented by Turan (48 species, 4.7 % of all species of flora xerophytes and 16.6 % of the ancient Medi-terranean geoelements). In the third place are tie geoelements (165 species, 16.2 %), where the largest number of species is represented by subcaucasian geoelements (68 species, 6.8 % of the entire flora and 41.8 % of binder geoelements). Common holarctic geoelements account for 70 species (6.9 %), Palaearctic dominates (57 spe-cies, 5.6 % of the entire flora and 81.4 from com-mon holarctic geoelements). Pluriregional geoelements and adventitious species represented a small amount (2 and 3 respectively). Consequent-ly, according to the predominant groups of studied geoelements the flora can be characterized as bo-real-Old Mediterranean binding.
geographical analysis, xerophytes flora, groups of habitats, habitat types, geograph-ical elements, the Russian Caucasus
1. Yurcev B.A., Kamelin R.V. Osnovnye ponya-tiya i terminy floristiki. - Perm', 1991. - 80 s.
2. Tahtadzhyan A.L. Floristicheskoe delenie sushi // Zhizn' rasteniy. - M.: Prosvesche-nie, 1974. - T. 1. - S. 117-153.
3. Tahtadzhyan A.L. Floristicheskie oblasti Zemli. - L.: Nauka, 1978. - 248 s.
4. Takhtajan A.L. Floristic regions of the world. - Barkeley; London, 1986. - 522 p.
5. Braun-Blanquet J. Essai sur les notions «d’element» et de «territore» phytogeographiques // Archives des scieces physiques et naturalles. - Geneve, 1919. - Ser. 5, Vol. 1. - P. 479-512.
6. Braun-Blanquet J. L’origine et le developpement des flores dans le massif central de France. - Paris; Zurich, 1923. - 282 p.
7. Braun-Blanquet J. Pflanzensoziologie. Grund-zuge der Vegetationskunde. - Berlin, 1928. - X. - 330 s.
8. Eig A. Les elements et les groupes phytogeographiques auxiliares dans la flore palestinienne, 1. Texte // Feddes Repert.(Beih.). - 1931. - Bd. 63. - S. 1-201.
9. Popov M.G. O primenenii botaniko-geograficheskogo metoda v sistematike rasteniy // Problemy botaniki. - M.; L.: Izd-vo AN SSSR, 1950. - T. 1. - S. 70-108.
10. Popov M.G. Osoki Sahalina i Kuril'skih ostrovov. - M.: Nauka, 1970. -138 s.
11. Davis P.H. Introduction // Flora of Turkey and the East Aegean Islands. - Edinburg, 1965. - Vol. 1. - P. 1-26.
12. Guest E.R. The vegetation of Iraq and adja-cent regions // Flora of Iraq. - Baghdad, 1966. - Vol. 1. - P. 55-108.
13. Portenier N.N. Geograficheskiy analiz flory basseyna reki Cherek Bezengiyskiy (Central'nyy Kavkaz). I. Prirodnye uslo-viya rayona i obschaya harakteristika ego flory i rastitel'nosti // Botanicheskiy zhurnal. - 1993. - T. 78. - № 10. - S. 16-22.
14. Portenier N.N. Metodicheskie voprosy vydeleniya geograficheskih elementov flory Kavkaza // Botanicheskiy zhurnal. - 2000. - T. 85, № 6. - S. 76-84.
15. Portenier N.N. Flora i botanicheskaya geo-grafiya Severnogo Kavkaza. - M.: T-vo nauch. izd. KMK, 2012. - 294 s.
16. Tahtadzhyan A.L. Proishozhdenie i rasse-lenie cvetkovyh rasteniy. - L.: Nauka, 1970. -146 s.
17. Lavrenko E.M. Osnovnye cherty botaniko-geograficheskogo razdeleniya SSSR i so-predel'nyh stran // Problemy botaniki. - M.; L.: Izd-vo AN SSSR, 1950. - Vyp. 1. - S. 530-548.
18. Lavrenko E.M. Provincial'noe razdele-nie Prichernomorsko-Kazahstanskoy podob-lasti stepnoy oblasti Evrazii // Botani-cheskiy zhurnal. - 1970. - T. 55, № 5. - S. 609-625.
