The paper presents the results of the analysis of the yield and component composition of supercritical CO2 extracts obtained from the aboveground parts of species of the genus Matthiola W.T. Aiton, growing in the southern part of the Republic of Dagestan. It was found that the yield of extractive substances obtained by supercritical fluid extraction was higher for M. daghestanica (2.04%) compared to M. caspica (1.20%), calculated on the weight of air-dried raw materials. The dominant compounds in the composition of the studied extracts of the genus Matthiola species are n-triacontanol (14.81–58.15%), α-linolenic (10.65–24.14%), and adipic (9.92–19.54%) acids. The detection of thymol in M. daghestanica and vitamin E in M. caspica determines their valuable biological and organoleptic properties.

In retrospect, the stages of the discovery for science of a rare Caucasian-Near Asian species, the dwarf tulip (Tulipa humilis Herb., Liliaceae), are shown. Literary sources and herbarium collections of species, including those in the digital herbariums of Moscow State University and Botanical Institute of the Russian Academy of Sciences, as well as images of living plants from open sources, are analyzed. In the forthcoming fourth edition of the Red Data Book of Krasnodar Territory, the dwarf tulip and the Lipsky tulip (T. lipskyi Grossh.) are recognized as conspecific, with priority given to T. humilis in the name of the taxon. In 2025, the species was confirmed to grow on the southern slopes of Mount Yatyrgvarta (Western Caucasus). This article provides updated data on plant morphology, development time, abundance and habitat of this isolated population. The habitat conditions of the dwarf tulip in the Caucasian State Nature Biosphere Reserve are stable, but the number is subject to fluctuations.

11 varieties of Prunus avium L. selection of the Institute of Fruit Growing (Belarus) and the Dagestan breeding experimental station of fruit crops branch of the Dagestan Agriculture Science Center (Russia), were evaluated for yield and adaptability to environmental conditions. The studies were carried out in 2022–2025. in the agrometeorological conditions of the Minsk region of the Republic of Belarus and the foothill province of Dagestan in accordance with the generally accepted program and methodology for variety study of fruit crops. According to the research results, the heterogeneity of sweet cherry varieties was established in terms of the level of realization of productive potential and the degree of adaptability to growth conditions. The variability range of the average yield for the sweet cherry variety sample was 7.5 (Antares) -12.0 t/ha (Lyuba). High yields (11.1–11.6 t/ha), along with the Lyuba variety, distinguished the varieties Dagestanka, Zhemchuzhnaya, Ehlitnaya forma 129/1, Minchanka and Regula. Different adaptability and environmental stability of experimental varieties of sweet cherries to the conditions of the cultivation environment is indicated by a wide range of variations in the values of adaptive properties: coefficients of variation (Cv) 12.2–38.8%, plasticity (bi) 0.82-1.19, stability (ϭd²) 0.02–0.48 and adaptability (KA) 73.6-117.8%, as well as stability factor (SF) 1.35–3.81. As a result of a rank assessment on the parameters of stress resistance and adaptability on the basis of "yield," varieties of sweet cherries of Dagestan selection were distinguished Dagestanka, Zhemchuzhnaya, Maral and Ehlitnaya forma 129/1, which received the smallest sum of ranks (23–33). Among the varieties of Belarusian selection, Regula and Minchanka showed the greatest adaptability to environmental conditions, with the lowest sum of ranks 42 and 43, respectively. These sweet cherry varieties, characterized by regularly high productivity and significant adaptive potential to the conditions of the place of growth, are of interest both for further use in breeding programs as a valuable starting material and for optimizing the industrial assortment.

The object of the study is a new protected area of regional significance, the "Teshebs Coastal Natural Complex," located on the border of the Gelendzhik Municipal District and the Tuapse District. The aim of the study was to inventory the rare and endangered gene pool of flora and to establish the sozological significance of the plant component of the Teshebs natural complex, which was created with the aim of preserving the biological and landscape diversity of the unique sub-Mediterranean natural complexes of the Black Sea coast of the Krasnodar Territory on the border of the cenoareal, as well as reference areas of Mediterranean vegetation and areas of old-growth forests. Geobotanically, this territory belongs to the Crimean-Novorossiysk province of the Mediterranean region (Tahtadzjan, 1978). The area between the Teshebs River valley and Inal Bay is the last eastern outpost of Russia's sub-Mediterranean ecosystems, located at the edge of the ecosystem's range. Here, habitats of Pinus nigra subsp. pallasiana (Lamb.) Holmboe and full-fledged populations of Pinus brutia var. pityusa (Steven) Silba are concentrated on a steep rocky coastal cliff. The coastal cliff in this coastal area is almost entirely covered with unique pine stands. The flora of the protected area is characterized by Mediterranean species: Ruscus ponticus Woronow, Jasminum fruticans L., Colutea cilicica Boiss. et Balansa, Rhus coriaria L., Quercus pubescens Willd., Carpinus orientalis L., Сonvolvulus cantabrica L., Salvia ringens Sm. The primary method for obtaining information on protected species was expeditionary route surveys. Office processing was conducted to clarify taxonomic affiliations. Species approved for the 4th edition of the Red Data Book of Krasnodar Krai were noted. Latin names are given in accordance with World Flora Online Plant List (2026). Key flora assemblages (oak, oak-hornbeam communities, glade vegetation, and shiblyak communities) were studied, with an emphasis on the coastal cliff and pebble littoral, where protected plant species thrive. Information on protected species is important in light of the upcoming new edition of the Red Data Book of Krasnodar Krai.The registered gene pool of protected plants in the Teshebs Protected Area under consideration includes 35 species.

The discovery of a new species for the Caucasus – Solanum capsicoides All. (Solanaceae) from the Republic of Abkhazia is reported. Information on the three localities discovered, the species' geographic origin, and detailed descriptions of the species composition of plant communities in its habitats are provided.

As a structure of the Imperial Kazan University, the Botanical Cabinet began its development in the second decade of the 19th century. K.F. Fuchs, E.I. Eichwald, P.Ya. KornukhTrotsky, N.V. Sorokin, and other naturalists played an active role in this process. This article is devoted to the attempts to diversify both the instrumentation and the herbarium collection of the Botanical Cabinet, undertaken by K.S. Merezhkovsky in the early 20th century. The data presented may be of interest to botanists and museologists, as well as anyone interested in the history of natural science.