The article presents results of the study of ruderal vegetation of the class Stellarietea mediae in Kryvyi Rih. The research on syntaxonomy of the class in Ukraine is briefly reviewed. Plant communities of highly competitive annual species of the open temperate humid and dry ecotopes are characterized. The studied vegetation of the class S. mediae is represented by 13 associations, 7 alliances, and 3 orders (15% of the total number of associations of the class in Ukraine). The characteristics of the identified syntaxa are provided. Their features comparing with the communities common for others regions in Ukraine, Russia, and Central Europe were established. It has been found that the alliance Amarantho blitoidis-Echinochloion crusgalli is coenotically specific and includes four associations described in Ukraine. Within the examined area, one of these associations, Amarantho retroflexi-Echinochloetum crusgalli, was recorded. The results of ordination analysis indicate that ecological differentiation of syntaxa of the studied class in Kryvyi Rih is defined by a set of edaphic factors (soil humidity regime, soil aeration, and nitrogen content). Among the climatic factors, the leading one is the continentality of climate. It has been established that parameters of thermo- and cryoregime do not significantly vary and are not determinant in differentiation of syntaxa of the class. An observed characteristic feature of the class S. mediae is expanding of monodominant communities of Ambrosia artemisiifolia, Atriplex tatarica, Iva xanthiifolia, and Kochia scoparia. It has been found that communities of the class represent initial stages of the overgrowing of ruderal ecotopes in the city. Further research and critical revision of syntaxonomy of the class are needed.

Keywords: Stellarietea mediae, syntaxonomy, classification, synphytoindication, associations

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