Results of the research of two fractions of the Kryvyi Rih urban flora, native and alien, are given. The data of structural and comparative analyses demonstrate that determining for urban flora formation is the native fraction maintaining original and zoning characteristics. Under influence of the alien fraction, representatives of synanthropic flora take leading positions on the family level in taxonomic spectrum, namely those of Brassicaceae and Chenopodiaceae families. At the same time, there is a decline of the role of typical for regional flora families – Caryophyllaceae, Lamiaceae, and Scrophulariaceae s. l. In addition, the alien fraction introduces to the city flora the instability element caused by a large number of therophytes. Besides, under its influence the tendencies of mesophytization and unification of the urban flora are revealed.

Keywords: urban flora, Kryvyi Rih, native fraction, alien fraction, structural and comparative analyses

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