The article is devoted to the study of the current state of populations of the species Hylotelephium ewersii (Ledeb.) H. Ohba (formerly Sedum ewersii Ledeb.) and Phedimus hybridus (L.) 't Hart (also known as Sedum hybridum L. and Aizopsis hybrida (L.) Grulich) in the floristic composition of the coenopopulations of these species in the Ile Alatau. The article presents a study and analysis of the biology of the populations of H. ewersii and P. hybridus in the Kastek Gorge of the Ile Alatau, the diversity of their life forms, and ecological reactions in specific ecological-cenotic conditions. Seasonal rhythms of development of H. ewersii and P. hybridus showed their stability and high adaptability to the conditions of the landscape mountain zone of the Ile Alatau. The studies made it possible to identify the adaptations of natural cenopopulations of H. ewersii and P. hybridus to long-term, sustainable existence in conditions of a sharply continental climate and to assess their current state. The article presents a taxonomic, ecological, and geographical analysis of the flora of the populations of H. ewersii and P. hybridus. The studied species H. ewersii and P. hybridus have a life form of herbaceous succulent-leafy terrestrial-creeping polycarpics with a rosette-less sympodial model of shoot formation, where, according to the position of the renewal buds, the studied species belong to the chamaephyte biomorph Key words: Hylotelephium ewersii, Phedimus hybridus, population, coenopopulation, Kastek Gorge, Ile Alatau

Calligonum leucocladum (Polygonaceae) is a characteristic shrub of arid and semi-arid regions of Central Asia, where plant survival is limited by scarce water and extreme temperature fluctuations. This study investigated the phytochemical profiles of three spatially separated populations of C. leucocladum collected from natural habitats in Kazakhstan. The results demonstrated the presence of various phenolic compounds, organic acids, and amino acids. Among them, artepillin C and caffeic acid phenethyl ester (CAPE) were detected in this species for the first time. Distinct differences in metabolite accumulation between populations were recorded. In particular, individuals from population P3, located in semi-arid mountainous terrain at an altitude of about 800 m above sea level, were characterised by increased concentrations of phenolic compounds, soluble carbohydrates and the osmoprotective amino acid proline. These population - specific metabolic features probably reflect biochemical adaptations to contrasting environmental influences. These results indicate that C. leucocladum is a valuable source of biologically active compounds, and variations in the composition of its metabolites are closely related to habitat conditions. Keywords: Calligonum leucocladum, phenolic compounds, artepillin C, proline, pharmacological potential, metabolic adaptation.

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