Annotated synopsis of decorative small-annual plants of the Flora of the Middle Dnieper region

Aims. To conduct a systematic (taxonomic), bio-morphological, geographical structural analysis of ornamental small-annual plants cultivated in the Middle Dnieper region and to find out their naturalization rate. Methods. To carry out structural analysis, generally accepted approaches of comparative floristics were used. In the composition of analyzed flora, autochthonous and allochthonous components are distinguished. The analyzed flora species are divided into groups of ergasiophytes and ergasiophygophytes. Results. An annotated synopsis of ornamental annuals (annuals and biennials, as well as those perennials that undergo accelerated entry into the generative phase of development under conditions of introduction, after which they mostly die off) has been compiled. The systematic, bio-morphological (by life expectancy), and also geographical (by primary habitats of introduced and general habitats of autochthonous species) of ornamental annuals cultivated in the region of the study structure were analyzed. The naturalization rate of introduced species is analyzed. Conclusions. There are 167 species-level taxa (species and hybrids) belonging to 110 genera and 34 families of angiosperms as part of the cultivated ornamental flora of small annual plants of the Middle Dnieper region. Annuals (124 species) predominate in terms of life expectancy. There are 27 species of biennials, and 16 of those perennials that, under the conditions of introduction, acquire the status of small annual plants (mostly species of the genera Coreopsis L., and Rudbeckia L.).