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Objective – to study the current distribution of Sedum pallidum in Ukraine, to analyze its state in the alien flora of Ukraine. Material and methods. The studies were conducted in 2008–2019 in the plain part of Ukraine and in the Mountain Crimea. Literature information, several national herbarium collections and other sources were analyzed. Special attention was paid to the delimitation of synantropic locations of S. pallidum from cultural ones. Results. S. pallidum is a sub-euxine species, which range occupies the Mountain Crimea. It is widely cultivated throughout Ukraine and is prone to naturalization, thanks to its vegetative and generative reproduction. In general, about 30 synantropic locations of S. pallidum have been recorded, mainly in the Middle Prydniprovia and Western Ukraine. Urban lawns and roadsides on light substrates are favorable ecological niches for S. pallidum. Соnclusions. S. pallidum is the alien species in the flora of the plain part of Ukraine and ergasiophyte in its origin. A potential secondary synanthropic range of this species occupies the whole country except the Carpathian highlands. It has been established that S. pallidum in the culture of the Forest-Steppe is a perennial herb. Two races identified in its composition (var. pallidum and var. bithynicum) are probably ecads, and have no systematic importance. In the culture, S. pallidum is characterized by successful vegetative and generative reproduction, which contributes to its naturalization. S. pallidum is often confused with other species of the genus, what does not contribute to its study in adventive floras. A key for S. pallidum determination has been proposed.

For the first time, a complete inventory and analysis of the taxonomic composition of the flora of the phytogeographic plot “Central Asia” in the M.M. Gryshko National Botanical Garden of the NAS of Ukraine were conducted. The plot “Central Asia” was established in 1953 for the directed introduction and naturalization of plants from Central Asia. Over 1,000 plant species have been tested here during all this time, which indicates a large amount of experimental work. The structure of the flora on the study plot has certain features of the flora of Central Asia. According to the inventory results, 308 valid taxa (species and subspecies) of higher vascular plants from 168 genera and 66 families have been recorded on the plot. Of these, 183 taxa belong to the natural flora of Central Asia. The structure of the flora of plants on the study plot has certain features of the flora of Central Asia. However, in the conditions of Kyiv, the plants of Central Asian flora requiring more temperate habitats (e.g., plants originated from northern steppes, valley and lowland forests) have taken root best. The geographical structure of the flora of the plot is dominated by ergasiophytes with Central Asian (25.0 %), Eurasian and Paleoarctic (together 34.2 %), and sub-Mediterranean (10.9 %) types of ranges. From this number, 42 species of ergasiophytes are endemic to Central Asia. The biomorphological structure of the flora of the plot is dominated by perennials (47.3 %), and the share of woody plants is 26.4 %. According to Raunkiaer’s classification of life forms, hemicryptophytes (28.4 %), phanerophytes and cryptophytes (25.1 % each) predominate on the plot. In the conditions of Kyiv, phanerophytes from mountainous regions appeared to be the most resistant plants. While among ergasiophytes of Central Asian origin, plants growing in forests, steppes, shrubs, and edges appeared the most represented. Among the ergasiophytes growing on the plot “Central Asia”, 24 species are listed in the red books of Central Asian countries. Currently, there are some problems related to the state of phytocoenoses on the phytogeographical plot “Central Asia” and its flora in general (e.g., death of many ergasiophytes of Central Asian origin due to inconsistency of climatic conditions, expansion of invasive organisms, growing anthropogenic load, etc.) However, thanks to the large-scale introductory work, the collection of plants on the plot has a unique composition and remains one of the most attractive decorations of the M.M. Gryshko National Botanical Garden.

Results of the conducted botanical surveys in the Forest-Steppe part of Zhytomyr Region are provided. Nine alien taxa (mainly xenophytes) new for the flora of the Right Bank Forest-Steppe have been identified: Allium altissimum, Amaranthus deflexus, Aphanes arvensis, Artemisia umbrosa, Crataegus sanguinea, Epilobium pseudorubescens, Erigeron strigosus, Polygonum calcatum, and Silene coronaria. Localities of these species are described and botanical-geographical comments are provided for most of taxa. There are also 64 taxa newly reported for the Forest-Steppe part of Zhytomyr Region, of which 31 are native plants, 32 – alien plants, and 1 species of unidentified origin. Twelve taxa are rare and protected at different levels. Invasive plants in need of monitoring are identified among newly reported species. According to the new data, flora of the Forest-Steppe part of Zhytomyr Region includes more than 1320 taxa of vascular plants. An important result was the discovery at the border of Zhytomyr Polissya and the Right Bank Forest-Steppe of localities of five expanding species of the genus Rubus with predominantly Central European ranges: R. bertramii, R. gracilis, R. hirtus, R. montanus, and R. plicatus. Expansion of these species of blackberries in the eastern direction within the territory of Northern Ukraine is associated with natural migration and is probably caused by the gradual climate warming.

The article provides an annotated list of new floristic finds in the flora of the Middle Dnieper (on territory of Cherkasy region, as well as adjacent districts of Kyiv and Poltava regions), both aboriginal rare and alien species, including “runaways from culture”. In some cases, notes are given on the taxonomic status, features of the natural range, ancient indications of the localities of certain species in the region. For the first time, 31 new taxa were introduced for the regional flora of Cherkasy region, including 8 native and 23 alien. The most valuable is the information about rare aboriginal plants, in particular Asparagus tenuifolius, Euphorbia salicifolia, Polygonum patulum, Rosa andegavensis, etc. In the Uman district of Cherkasy region, the location of three species of flora that were considered disappeared in the region: Pentanema oculus-christi, Salvia dumetorum and Staphylea pinnata. For once, 3 new alien species have been introduced for the flora of Poltava region: Anthriscus caucalis, Lonicera × notha and L. ruprechtiana. The research revealed new locations of invasively active foreign plants, including ergasiophygophytes: Phytolacca acinosa, Silphium perfoliatum, Vitis riparia, Zizania latifolia etc., and quarantine xenophytes: Cenchrus longispinus and Eriochloa villosa. Progressive distribution of xenophytes with primary sub-Mediterranean and Central Asian habitats has been noted. Population growing of foreign plants emphasizes the existing negative trend of adventitia of the flora.The issues of naturalization of ergasiophytes are discussed, in particular the presence of mass selfseeding in the centers of their primary introduction, which is the impetus for their further spread. Provided information on spontaneous seed reproduction of species such as: Castanea sativa, Catalpa ovata, C. speciosa, Pilosella aurantiaca, Verbesina encelioides, Viola sororia and other cultivated plants. The above and similar information is an considerable element of comprehensive floral research.

The results of the inventory of wild plants in the territory of O.V. Fomin Botanical Garden in 2021 are given. For the needs of the research, an online project "Biota of the O.V. Fomin Botanical Garden (Kyiv)" has been launched. Historic milestones and latest achievements in the study of spontaneous flora of the Botanical garden are characterized. The tendency towards the increase in number of vascular plant species is noted. Specifically, in the middle of the 20th century there were reported 220 species of vascular plants for the Botanical garden territory, in the early 21st century there were 245 species (2005) and 314 species from 215 genera and 65 families (2008). In 2015, 347 species from 223 genera, 67 families, 4 classes and 3 divisions were noted. According to the results of the study in 2021, 115 new plants were found by the authors of the article in spontaneous flora of the Botanical garden. The list of new taxa, their habitat and date of discovery, as well as the authorship of the findings are given. For the first time, 4 taxa of alien plants were found for the flora of Ukraine: Arabis procurrens, Lactuca sibirica, Polanisia dodecandra subsp. trachysperma and Talinum paniculatum. Their main morphological, taxonomic and geographical characteristics are briefly described, information on the naturalization of these taxa in other countries is given. For the first time for the flora of the Right-Bank Forest-Steppe and the urban flora of Kyiv the following are given: Cymbalaria muralis, Cyperus glomeratus, Phedimus stoloniferus, Ranunculus acris subsp. friesianus, Tradescantia × andersoniana. Additionally, during the research there were identified 29 introduced plants with high naturalization rates that need further monitoring. Their list and features of naturalization are given. According to the results of the study, a complete list of the spontaneous flora of the O.V. Fomin Botanical Garden includes 524 taxa from 291 genera and 71 families.

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For the first time, information on the flora of the Siverskyi Donets basin in the vicinity of Balakliya town (Kharkiv region of Ukraine) was summarized based on the comprehensive analysis of published data, herbarium material, and own field examinations. Field surveys were conducted during September 2015 and March-July 2016. The surveyed areas were located mainly in the valleys of the Sіverskyi Donets river and some of its tributaries within the former Balakliуa district. The conspectus of flora comprising 933 taxa of vascular plants (including 798 recorded during field surveys) has been prepared. In particular, 739 taxa of native and 194 taxa of alien plants were recorded. The habitats of 14 species from the Red Book of Ukraine were found. The locations of other protected, uncommon and new for the flora of the region plant species were also identified. Several taxa (i.e., some of the calciphytes like Astragalus albicaulis, Linum czernjajevii, Odontarrhena tortuosa subsp. cretacea, Scutellaria supina, and Silene supina) were found out of their previously known ranges. Newly established locations of some other species (e.g., Ephedra distachya, Onosma simplicissima, and Ornithogalum boucheanum) significantly complement previously known chorological data. Finally, information about new findings of such alien taxa actively expanding new areas as Cornus sanguinea subsp. australis, Fraxinus pennsylvanica, Sedum sexangulare, Ulmus pumila, and Vitis vulpina is provided.It has been established that the flora of the Siverskyi Donets basin in the vicinity of Balakliya town is a rich natural center of phytodiversity being under active adventisation. Forest reclamation plantations play a significant role in spreading the alien plants. Railway and the pine terrace of the Siverskyi Donets also serve the migration corridors for many of such alien plants.