This article highlights the taxonomic diversity and systematic structure of the flora of NNP «Pyriatynsky». It has been determined that its flora includes 1174 species of higher vascular plants belonging to 509 genera, 122 families and 6 divisions. The flora is sufficiently representative for species diversity of the Left-Bank Dnipro area. The flora belongs to a transitional type between Boreo-temporal floras and mediterranean ones. This claim was supported by distribution of higher-rank taxa, by analysis of the spectra of families and genera as well as the results of cluster analysis of floras parsimony by Sørensen—Czekanowsky index, and by factor analysis for the parameters of the systematic structure.  The spectra of families and genera of the spontaneous flora and its native fraction are similar, except minor differences in ranks of some taxa. The systematic structure of the alien fraction has a termo-xerophilous character caused by dominant Mediterranean, North American, and East Asian elements. The specta of genera have a boreal character. This is a result of the flora development under floodplain conditions in the north of the Left-Bank Dnipro area. The differentiation of taxa within ecocenophytons and cenofloras bears a complex character. The maintenance of the high-level species diversity should be based on conservation and restoration of all natural floristic complexes, limitation of biological invasions and development of the Uday River ecological corridor.

Keywords: flora, systematic structure, NNP «Pyriatynsky», taxonomic diversity, structural-comparative analysis, Ukraine

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