We revealed 40 facultative dominants which are main coenosis originators for natural vegetation of slope ecotopes in the Black Sea part of the Ingulets River catchment area. We provide results of cluster analysis for similarity-dissimilarity of vegetation formations and coenostructures with uncertain syntaxonomic status. The coenostructures with dominance of Galatella villosa, Linum czernjajevii, Marrubium praecox, Pimpinella titanophila, Potentilla incana, Tanacetum millefolium, Ulmus minor are proposed to be considered as such communities where quantity and biomass of ‘secondary’ species (subdominants and assectators) exceed those of ‘canonized’ dominants due to fluctuations. The taxonomic richness of natural vegetation on slopes in this region is presented in prodromus; it consists of 114 associations related to 33 formations, 8 formation classes, 3 vegetation types.

Keywords: plant communities, dominance index, cladogram, formation, prodromus, Black Sea area

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