Vegetation meadows basin of the river Southern Bug is cereal-legume forbs grouping, which has high biological productivity, especially in areas where growing Trifolium pratense and Festuca pratense. In the meadow phytocenoses there are many valuable medicinal herbs which are provide significant gathering of phytomass. Established dominant species of meadow grouping and superspecies taxons (order, families), studied their morphogenesis. Class of Monocotyledones, that are belonging to phylum Mahloliofita represented by only three families Poaceae, Cyperaceae, Typhaceae and class Dycotiledones consist of 12 families. Basically, the families, that are belonging to the class Dycotiledones represented by a small number of genuses (1-2) and only family Asteraceae consist of 14 genuses. Species composition of this family it is a wild poisonous and medicinal plants.

Keywords: meadow vegetation, grouping, phytocenoses, biological productivity, systematical structure, taxon.