Two small populations of Euonymus nanus were identified in the Russian Far East, near the city of Svobodny, Amur Region. The geographic coordinates are provided, and the total number of plants was estimated. Measurements of leaf blade dimensions and shoot height from these wild Russian populations (Amur Region and the Republic of Crimea) are presented and compared with published data for populations from China. Vegetative shoots were counted within randomly selected one-square-meter plots, and the total population size was extrapolated based on the overall occupied area. The average leaf size and shoot height of the Amur plants were compared with quantitative data from literature sources for wild populations in the Republic of Crimea and China.

We present a revised classification system for the class Ranunculo japonici–Betuletea er manii based on the analysis of 442 phytosociological relevés from Japanese Archipelago, Sakhalin, the Kuril Islands, and Kamchatka Peninsula. The resulting system recognizes 17 associations and two community types, arranged within two orders and three alliances. We clarify the nomenclatural status of previously published syntaxa, describe several new units, and designate types for previously published names in accordance with the International Code of Phytosociological Nomenclature. This revised classification provides a coherent and regionally consistent framework for Betula ermanii forests and shrub thickets of Alnus alnobetula s. l. in the insular sector of Northeast Asia and offers a foundation for future comparative, biogeographical, and conservation-oriented studies.

This study aimed to evaluate the possibility of introgression between the StYgenomic species Elymus gmelinii and E. pendulinus in mixed populations using hybridization and molecular markers. Analysis of ISSR markers from individuals grown from seeds collected in natural populations revealed the presence of cross-specific markers in some plants. To test for introgression potential, we generated a series of interspecific hybrids between Primorye Territory biotypes of the two species. Seed fertility stabilization was demonstrated in these hybrids. Variability and specificity in sequences of the nuclear gene GBSS1 (waxy) were examined in the hybrid E. gmelinii BKA-2059 × E. pendulinus HAS-2075, compared to parental biotypes and reference samples. The data suggest that intragenic recombination occurred in an intron of the maternal genotype between the relatively closely related St1 and Y subgenomes. Overall, our findings support the delineation of E. gmelinii and E. pendulinus as distinct species. However, under the monsoon climate with higher humidity in southern Primorye Territory, E. gmelinii exhibits a shift from xerophytic Siberian habitats to the more mesophytic ecotopes characteristic of E. pendulinus, leading occasionally to shared habitats. This ecological convergence increases the likelihood of interspecific introgression and mutual enrichment of the species' gene pools.

In the East European tundra, 3 new associations of meadow communities on warm valley and hill slopes were described in the class Mulgedio–Aconitetea. Meadow communities dominated by tall mesophytic herbs of the ass. Veratro lobeliani–Geranietum albiflori ass. nov. are attributed to the alliance Polemonio acutiflori–Veratrion lobeliani. The range of the alliance first described on the Yamal Peninsula has been extended to the East European tundra and the Polar Urals. The character species of the alliance have been clarified. Meadow-like communities dominated by short herbs, with the participation of tall herbs, dwarf shrubs, and mosses, are classified into two associations – Salici herbaceae–Alchemilletum glomerulantis Lavrinenko et Lavrinenko ass. nov. and Astragalo arctici–Trollietum europaei ass. nov. in the new alliance Tephroserido integrifoliae–Pachypleurion alpini all. nov. Both alliances are included in the northeuropean order Epilobio lactiflori–Geranietalia sylvatici. Zanokha validated the three associations previously established in the Taymyr Peninsula. The meadow syntaxa of central and eastern part of Siberian Arctic differ significantly in their species composition from East European and West Siberian syntaxa, the boundary coincides with the border between the East Siberian and European–West Siberian provinces of the Arctic floristic region. New higher syntaxa need to be described for associations in Taymyr and Arctic Yakutia.

The existing monitoring strategy of Mts. Iglit-Baco National Park (MIBNP) employ extensive use of fires. These practices are hypothesized to hinder the natural succession from grassland to forest. To address these concerns, a biodiversity assessment utilized incidence-based sampling with nineteen repetitions from 2020–2021 across five sites within the Core Zone of Monitoring. A total of 77 species belonging to 27 families were documented. Spatiotemporal post-burning biodiversity trends exhibit the pattern of dominance of certain introduced and native plant species such as Themeda gigantea for site 1, Chromolaena odorata for site 2, Themeda triandra for site 3, and Imperata cylindrica for sites 4 and 5. These results facilitated a deeper understanding of the progression of changes in species composition as an impact of burning practices through space and time.

As a result of studying the lichenological herbarium collections of LE, HERZ, LECB it was revealed that Usnea samjatnini Tomin is a new synonym of Usnea barbata (L.) F.H. Wigg. A lectotype of U. samjatnini Tomin is designated from specimens deposited in LE. The article provides information on the morphological, anatomical and chemotaxonomic features of polymorphic species U. barbata.

We aimed to study the effect of elevation gradient on the cytogenetic characteristics of Plantago major L. We determined the mitotic index, the frequency of chromosomal aberrations, micronuclei and chromosome numbers in the cells of the apical root meristem of the seed progeny of plants inhabit altitudes of 200, 600, 2000 and 2700 m above sea level. The frequency of chromosomal aberrations increased at altitudes more than 2000 m above sea level, which indicates the presence of a genetic effect. There was no similar increase in the frequency of micronuclei in interphase cells. There were no trends in cell proliferation (mitotic index) and the ratio of mitosis phases in accordance with the elevation gradient. Plants from populations inhabit different altitudes are diploids. No changes in chromosome numbers along the altitude gradient were detected.

The early Paleogene floristic background and taxonomical inventory of palaeobotanical data of East Asia are studied for the first time using quantitative techniques. The record comprises 110 micro- and macrofloras from 73 localities of Eastern Siberia, Far East of Russia, China, and Japan. The analysis of the floral record reveals a taxonomical diversity of 1119 species of 578 genera from 132 families. Angiosperms represent the most diverse division accounting for over two-thirds of family diversity. The application of multivariate statistics provides insight into the floristic similarities of the single palaeofloras and the relation between taxonomic entities, and allows to trace the spatio-temporal distribution of six floristic groups characterised by taxonomic associations. The floristic composition in the study area did not undergo any significant changes throughout the early Paleocene, while the early Eocene saw a distinct increase mainly referable to a diversification of angiosperms. This diversification can possibly be related to the coeval warming trend. Our analysis of the Paleocene floras supports their continuity with Late Cretaceous floras, relative floristic homogeneity and the existence of only two floristic provinces. For the early Eocene we suggest at least three floristic provinces. Our results support a diffuse origin of the early Paleogene floras of East Asia and a lower to mid-latitudinal appearance of angiosperm taxa and a pole-ward migration thereafter, which generally supports the Boreotropical hypothesis. The early Paleogene floras of East Asia show minor spatial and temporal variations in taxonomic composition, with new taxa appearing in the fossil record at different times and having different ecologies.

The floristic research in Uzbekistan was intensified in the 21st century, being raised on new methodological level. As plants of aquatic habitats are often missed in routine floristic studies, we aimed to test the completeness of aquatic flora representation in the checklists, published recently for particular administrative regions. We studied all types of waterbodies in Dzhizak, Navoi, Samarkand and Tashkent regions. We revealed three taxa new for Uzbekistan (Bolbochoenus laticarpus, Potamogeton × angustifolius, Limosella aquatica). All the 12 species that we found for the first time in some regions of the country are not rare in Uzbekistan and in Central Asia in general. Thus, in spite of significant progress of floristic studies in Uzbekistan, more attention still should be paid to aquatic plants. Lowland artificial freshwater reservoirs and montane lakes are the most promising for future aquatic plant surveys.

The paper presents data on the methods of stimulation of Iris mandshurica seed germination and the effect of different 6-BAP concentration regimes on the multiplication and quality of microplants. The proposed scarification using H2SO4 made it possible to accelerate the germination of mature seeds many times, which occurred without the use of growth regulator. It was found that the formation of adventitious buds at the base of microshoots occurs at all concentrations of 6-BAP studied, however, the concentration of this phytohormone affects the quality of the resulting plant material. Addition of 1 mg/l 6-BAP to Murashige and Skoog basic medium increased the number of microplants as well as shoot height. Cultivation on Murashige and Skooga medium without regulators is sufficient to obtain a well-developed root system and does not require the use of additional growth stimulants. Adaptation of microclones to ex vitro conditions using commercial soil does not cause difficulties, and the plant survival rate is high and amounts to 76%.