The paper deals with anatomical parameters of the leaf of two genus representatives Rhododendron L.: R. catawbiense Michx. and R. brachycarpum D. Don, cultivated under conditions of N.V. Tsitsin Main Botanical Garden of the Russian Academy of Sciences. The morpho-anatomical structure of the leaf, used in the diagnosis and taxonomy of species, is also a key indicator of its functional characteristics. It is no less important for studying the mechanisms of their adaptation during introduction into new growing conditions and allows to find ways to optimize the conditions of their life and cultivation. Introduction experience is a prerequisite for studying the adaptive potential of species and for developing methods for managing the growth and development of these plants. The paper provides a detailed ecological and geographical characteristics of natural growth areas of R. catawbiense (eastern part of North America), R. brachycarpum (Far East, Republic of Korea, Japan) and the introduction area of Moscow (North-Eastern Administrative District, N.V. Tsitsin Main Botanical Garden of the Russian Academy of Sciences). In this work, for the first time, a detailed anatomical and morphological analysis of the leaf structure of two genus representatives Rhododendron: R. catawbiense and R. brachycarpum was carried out, and diagnostic signs of changes in the parameters of the structure of leaves, formed in conditions different from the natural habitats of species, were revealed during their introduction into N.V. Tsitsin Main Botanical Garden of the Russian Academy of Sciences.

This paper discusses morphological and anatomical aspects of the first-and-second-year-leaf epidermis of the two winter-green species, genus Rhododendron L.: R. catawbiense Michx. and R. davidsonianum Rehd., grown in the Bugsko-Polessky Region from the seed reproduction of the Central Botanical Garden of the National Academy of Sciences of Belarus. The representatives of the studied genus are promising crops for planting gardens, settlements and interiors. Therefore, the study of leaf anatomy lets to find plants adaptive features to different environmental conditions and identify their adaptation capacity in the new conditions of growth. The paper identified diagnostic features, as well as similarities and differences of morphometric parameters. The research method was a comparative anatomical one. The author made a code of diagnostic features of the leaf anatomical structure, which described the views of cross sections. The character of the natural confinement species lays its mark on the formation of individual elements of the leaves structure, ensuring their successful adaptation to the new conditions of growth. The studies have shown that both species quite successfully acclimatized and are promising for mass reproduction and wider use in the Bugsko-Polessky Region, and this is supported by qualitative and quantitative indicators of the morphology and internal leaf structure.

The following paper considers aspects of systematic and ecological structure of the weed medicinal plants growing in the biosphere reserve Pribuzhskoye Polesye. The studied weed plants of the region are considered to be used in pharmacology and medicine. Therefore, a detailed study of environmental groups and economic importance of commensal medicinal plants can serve as a basis for new trends development in resource studies of medicinal plants. The paper identifies diagnostic signs, as well as similarities and differences of morphometric evidence. The collection of field data was carried out by reconnaissance of the terrain. The study shows that the territory of the biosphere reserve Pribuzhskoye Polesye is characterized by a rich species composition of synanthropic weed medicinal plants of 57 species growing in different habitats that can be used for the treatment of diseases of the gastrointestinal tract, circulatory system and respiratory system. It is necessary to use weed plants for medicinal purposes to increase the base of receiving biologically active materials of plants.