The results of a comparative study of the structure of some vegetative organs of A. caspium and A. tschimganicum growing in natural conditions in Uzbekistan are presented for the first time. During the study of the desert representative A. caspium, the following diagnostic, structural features were re

The morpho-anatomical structure of the aboveground and underground organs of the rare endemic species Iris (Juno) magnifica, growing under natural conditions of the Zeravshan ridge, Samarkand mountains, has been studied for the first time. A comparative analysis of the morpho-anatomical structure of the aboveground and underground organs revealed characteristic diagnostic signs of a microscopic structure. The complex of anatomical features of the aboveground and underground organs of the studied species are species-specific and can be used to solve taxonomic problems of this genus of plants, as well as the Red Book endemic species of juno irises, are of particular interest in connection with the potential for their vegetative reproduction.

The article provides a review of studies of the vegetation cover of the Western Tien Shan of the NorthEastern slope of the Kurama ridge of the Parkent district (the left bank of Parkentsai) with the participation of the rare endemic species Juno orchioides. The article presents the main results of work in the field of geobotany and botanical geography carried out in the Tashkent region. A list of plants of 4 communities of the herb-shrub association with the participation of the species Juno orchioides is given. The association contains more than 90 species of plants. Of these, trees – 10, shrubs – 9, perennials – 71, annuals – 8. Anthropogenic factors and grazing are the reason for the decrease in this species of Juno orchioides, and in the future, measures for reintroduction must be applied to preserve and restore this species.

The anatomical structure of the leaf of the Central Asian endemic species of Juno vicaria, growing in two different ecological conditions (Baysun Mountains of Surkhandary region and Tashkent Botanical Garden of Uzbekistan) was analyzed and diagnostic signs were determined. Also identified are adaptive mesomorphic and xeromorphic signs from an environmental point of view. A species that grows in natural habitat is dominated by more xeromorphic signs: a thickened outer wall of the epidermis; numerous epidermal, spongy cells; submerged stomata; small, multi-row sclerenchymal and collenchymal cells, which indicate a more xeromorphic and adaptability, as well as the wide distribution of this species to the natural growing conditions. In a species growing under the conditions of introduction of the Tashkent Botanical Garden, more mesomorphic features predominate: thin-walled, large, few epidermal, spongy cells; not immersed stomata; large non multi-row sclerenchymal and collenchymal cells, which show that the species is adapted to altered habitat conditions.

The ontogenesis of the form Biota orientalis compacta (Cupressaceae) was first studied in the conditions of introduction of the Tashkent Botanical Garden. The passage of periods and stages of ontogenesis, full ripening of the cones, a high rate of growth and development, as well as high seed productivity are the main indicators of the success and prospects of the introduction of the form Biota orientalis compacta. The data obtained will serve as a theoretical basis for the agrotechnical development in landscaping.