During the past centuries high level of agricultural production resulted in a significant decrease steppe vegetation. In transformed landscapes South Ukraine cultural monuments such as old settlements can have the potential for biodiversity conservation. During the last decade (2010–2019) the flora of 18 earthworks of the Lower Dnipro ancient settlements with varied area from 1.1 to 18.7 ha was investigated. All settlements located on the steep bank of the Dnipro River on both sides (Kherson and Mykolayiv Regions), mainly between two closely spaced ravines or «balkas». The river terrace and ravines provided a natural protection for the settlements on three sides, and on the another side they were protected by artificial moat and shaft. The Dnipro was acknowledged as playing a key role in specific location of the earthworks as a leading waterway for trade and economic structure formation in the classical and Hellenistic periods. A list of the flora of vascular plants includes 526 species wich belongs to 279 genera, 74 families, 3 classes and 2 divisions. Total species richness ranged from 125 to 290 (178 species per archeological site in average). An appreciable number of native plants indicate a hight level of preservation of the objects. The contribution of native species in old settlements varied much from 62.1% (Liubymivske) to 81.1% (Velyke Tiagynske). The contribution of native species to the alien species is 3:1. Beside this, in the study area, we identified 30 species of protected vascular plants, of which 10 plant species are included in the Red Data Book of Ukraine (Astragalus borysthenicus, A. dasyanthus, Elytrigia stipifolia, Gymnospermium odessanum, Stipa capillata, S. lessingiana, S. pulcherrima, S. ucrainica, Tulipa biebersteiniana, T. gesneriana) and 20 plant species are included in the Red List of Kherson Province: Amygdalus nana, Bellevalia sarmatica, Bromopsis heterophylla, Dianthus andrzejowskianus, Ephedra distachya, Ferula capsica, Fraxinus excelsior, Hyacinthella leucophaea, Jurinea salicifolia, J. stochadifolia, Limonium platyphyllum, Linaria macroura, Linum czernjajevii, Prangos odontalgica, Quercus robur, Silene supina, Valeriana stolonifera, Veronica capsellicarpa, Vinca herbacea, Vitis sylvestris.

Plant communities of windbreak forest strips in the Middle Dnieper region are studied. Their diversity requires a new syntaxonomic solutions due to significant difference from natural plant communities. The syntaxonomy based on the identified coenotic influence of planted tree species within windbreak strips. It was developed after descriptions of the entire species in communities including typical ruderal species that optimally exist in this environment, species of natural forests and shrubs that have acquired the ability to survive in these conditions. The alliance Sambuco nigrae-Quercion robori and three association Alliario petiolatae-Ptelietum trifoliatae, Elytrigio repentis-Quercetum robori, Sambuco nigrae-Quercetum robori belong to the basic order Chelidonio-Robinietalia pseudoacaciae with synanthropic shrub vegetation were described as new for science. Moreover, three association Poo nemoralis-Tilietum cordatae, Geo urbano-Fraxinetum and Balloto nigrae-Ulmetum within Geo-Acerion platanoides were provided as ass. nova prov. Phytocenoses that marked a new rank syntaxons, are the result of the spontaneous formation of ecosystem populations of allochthonous and autochthonous species of the regional flora of the Forest-Steppe of Ukraine under the conditions of the edificatory effects of artificially created trees stands. The peculiarities for all identified and newly described syntaxa are presented.

This article presents the results of cenotype and ecotype analyzes of genus Epilobium L. s.l. (Onagraceae Juss.) in the biotopes of Ukraine. Scientists count about 20 species of genus Epilobium (including Chamerion) of Ukraine. Species of genus Epilobium are characterized by such biological features as a fairly uniform appearance and high hybridization capability of almost all species. Species of genus Epilobium belong to two types of ecological groups – mesophytes and hygrophytes. Representatives of genus Epilobium grow mainly along the banks of rivers, in ditches, on floodplains, in wet forests, on swamps, in clearings and on burnt sites after forest fires. Many species occur in the mountains from the upper forest to the alpine zone. A number of species of genus Epilobium are actively involved in the formation of different types of biotopes (according to EUNIS classification adapted for Ukraine). Epilobium hirsutum L is a constant and characteristic species of the UkrBiotop E:1.13 – Wet meadows tall-grass plant aggregation or according to the classification of habitats of Ukraine В4.1.6 – Herbaceous nitrophilous fringes of lowland rivers and Т3.3.2 – Moist tall-forbs grasslands. Epilobium montanum L. is a constant and characteristic species of UkrBiotop G:1.123 – Birch forest in fresh and droughty conditions and К2.2.1 – Subalpine to alpine calcareous screes and is actively involved in the formation of another Phanerophyte UkrBiotope G:2.111 – Forests Picea abies Polissya. Characteristic species of habitat К1.2 – Siliceous screes of Carpathians are E. collinum C.C. Gmel. and E. angustifolium L. (= Chamerion angustifolium (L.) Holub). Epilobium alsinifolium Vill. is characteristic of the marsh mountain subtype of habiata B1.21а – Mountain hard-water springs on tuffs and travertine. Еpilobium alpestre (Jacq.) Krock is a characteristic species of habitat Т4.4.1 – Subalpiane broad-leaved tall-herb habitat on silicate substrates and is one of the characteristic species for the biotope Т4.4.2 – Subalpine calcicolous tall-herb communities. Epilobium dodonaei Vill.(= Chamerion dodonaei (Vill.) Holub)one of the dominant herbs of habitat В4.2.2 – Sparsely vegetated gravel banks with herbaceous vegetation and is one of the characteristic species of communities habitat Ch7.2 – Willow scrub of river gravel banks.

The article summarizes the results of population analysis that were proved on the test platform of the biological laboratory of the Institute of Ecology named by K.A. Malinowski in Carpathians Mountains. Since 1974, the authors conducted stationary observations and field experiments in populations of Homogyne alpina (L.) Cass, at an altitude of 920–2050 m above the sea level. Preconditions causing the emergency of the multivariate phenomenon of plant population development in different ecological-coenotic situations are discussed. There are convincing arguments that multivariate is the result of adaptive transformations. There are operative changes of partial strategies of populations under the influence of natural and anthropogenic factors on these principles. To our opinion, there isn`t multivariance at the level of vitality groups. Accordingly, in each of the three vitality groups are implemented its specific and qualitatively unchanged basic variant in the whole range of H. alpina. The population of H. alpina contain one, two or all three vitality synthogenesis schemes depending on the presence of types of vitality groups. The priority can be given to any of these vital groups, depending on their numerical composition. Authors propose to label each of these groups with an appropriate color based on the RGB color separation principle. It allows creating color markers for prosperous, equilibrium or depressed population that are easy to expert assessments of their viability and perspective for self-healing. The possibility of using computer models for H. alpina synthogenesis algorithms in the vital groups are discussed. The results of experiments with the computer model are presented. Authors concluded, that an incomplete set of vitality schemes occurring in suboptimal conditions limits the range and plasticity of changes in self-support strategies of H. alpina population and increases the risk of their systemic degradation. The interpretation of the vitality structure opens up new opportunities for managing them, through a purposeful correction of their vitality structure. 

 80 species of lichens and 12 species of lichenicolous fungi were found on Khortytsia Island. The lichen Verrucaria fusconigrescens is for the first time reported for the continental part of Ukraine. Lichens Acarospora insolata, Bacidia fuscoviridis, Caloplaca chlorina, C. soralifera, C. xerica, Dermatocarpon miniatum, Lecanora argopholis, L. orosthea, L. swartzii, Lobothallia alphoplaca, Monerolechia badia, Rhizocarpon lecanorinum, Xanthocarpia crenulatella, Xanthoparmelia loxodes and lichenicolous fungi Abrothallus caerulescens, Lichenostigma elongatum, Marchandiomyces corallinus, Polycoccum pulvinatum, Stigmidium xanthoparmeliarum, Zwackhiomyces lithoiceae are reported for first time for Zaporizhzhia Region. Melanelixia fuliginosa,Protoparmelia badia and Evernia mesomorpha were erroneously reported for Khortytsia Island and therefore should be excluded from the list of species. Of the recorded lichens, two species, Lassalia pustulata and Xanthoparmelia camtschadalis, are included into the Red Data Book of Ukraine. Verrucaria fusconigrescens is a new host for Zwackhiomyces lithoiceae.