The article provides information on the flora of Male Opillya, the southwesternmost part of the Opillya area, Western Ukraine. The ecological and geographical peculiarities of the area determine its rich plant diversity. The flora of Male Opillya comprises 1325 species of vascular plants belonging to 511 genera, 95 families and five divisions. A characteristic feature of the flora of this area is a small number of vascular cryptogamic plants and gymnosperms – 27 species, or 2.04% of the total number of species of vascular plants. The division Magnoliophyta consists of 1298 species (97.96%), of them Liliopsida accounts for 21.21% and Magnoliopsida – 76.75%. Taxonomic diversity of the flora is characterized by the following proportions: mean number of species per family is 13.95, mean number of genera per family – 5.38, mean number of species per genus – 2.59. The ten leading families by number of taxa contain together 757 species (57% of the total number) and 134 genera. Among them, the best represented families are Asteraceae (193, or 25.5%), Poaceae (105, or 13.87%), and Rosaceae (71, or 9.38%). The ten largest genera by number of species (from 51 to 14 species in each), comprise 204 species, or 15.4% of the total species diversity. Of them, the following genera contain the highest number of species: Carex (51 species), Hieracium (25), and Veronica (23). The genera represented by a single species make up more than half of all genera of the flora (277, or 54.21%).

Keywords: flora, species diversity, taxonomic structure, Male Opillya

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