The systematic structure of alien fraction of the flora of Starobilsk Grass-Meadow Steppe (Ukraine), which includes 377 species from 237 genera and 61 families, was analyzed. We observed a higher family rank for the Chenopodiaceae and lower ones for the families Fabaceae (5) and Rosaceae (11), comparatively with the natural flora; the floral proportion is 1 : 3.9 : 6.2; while generic coefficient is rather low, 1: 1.59. A strictly identified spectrum of leading families was not found, a leading genus is Amaranthus. Comparison with other studied similar alien factions of the floras in various parts of Ukraine demonstarted some resemblance to the alien fraction of the flora of Romny-Poltava geobotanical district.

Keywords: alien fraction, systematic structure, floral proportions, grass-meadow steppe, Ukraine

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