A comparative analysis was made of eight elementary floras situated along the boundary of the Central and Eastern European floristic provinces in the Volyno-Podolian elevation. Based on a comparative analysis of the special species’ complexes and on peculiarities of the abiotic lanscape components, geomorphological factors were found to be significant in determining the present diversity level of the marginal floras of this type. The relative continuance of the phytochorias leads to a gradual modification of the species’ composition and the structure of the floras. The high sensitivity of these floras makes it especially important to reserve territories for the conservation of large regions of landscape diversity.
Keywords: Marginal flora, Western Ukraine, comparative analysis.