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Crambe tаtaria Sebe´ok is one from four species of genus Crambe, which grow on the territory of Kazakhstan. This species is listed in Red Data Book of Kazakhstan as rare endangered species, and its natural habitats are chalk areas of west part of the country. The structure of seven populations of Crambe tаtaria was studied in the Aktobe Region. The optimum habitat conditions for this species are northern and northeast slopes of chalk uplands, chestnut and light-chestnut soils. In unfavorable conditions of summits and southern slopes of lime uplands, C. tаtaria can form invasive-regressive populations with the prevalence of virgin plants. The variation of the structure of the populations does not lead to a decrease in their resistance, which highlights high plasticity of the species within chalk uplands.

The article presents the results of a study of the anatomy of the vegetative organs (roots, leaves and petioles) of rare and endangered plant species Crambe tatarica Sebeok, growing in the Aktobe region of Kazakhstan. The studied plants were collected from two populations: the first population was found in the chalk mountains of Akshatau, in the vicinity of the village of Koktogay, the Wilsky district, and the second population was found in the chalk mountains of Ishkargantau, the village of Karabulak, the Khobdinsky district. This species belongs to mesoxerophytes and calcephytes. According to the available literature, in Kazakhstan C. tatarica has the status of 3b (R)-rare, relict species. Some representatives of the genus Crambe L. are important economic species because they are oilseed, melliferous, fodder and medicinal plants. Study of the roots of C. tatarica revealed the presence of the phloem parenchyma, radial rays, xylem parenchyma and cells of a mechanical tissue, brachisclereids. In the internal structure of leaf numerous starch grains were noted in the parenchyma; brachisclereides were often found on periphery of the leaf, and sclerenchyma cells were apparent in the center of vascular bundles. Large number of vascular bundles was noted in the petioles; the outer wall of the epidermis cells was thickened. In the studied organs, no large cells with a liquid content were found. The obtained information on features of the anatomical structure of roots, leaves and petioles of C. tatarica will be used in the future for diagnostics of the raw plant material, and in the studies of its phytochemical composition.

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The presence of non-native plants on dumps in Kuzbass was studied. 26 plants included in the Black Book of Flora of Siberia were identified: Acer negundo, Amoria hybrida, Atriplex sagittata, Conium maculatum, Conyza canadensis, Echinochloa crusgalli, Echinocystis lobata, Echium vulgare, Elaeagnus angustifolia, Epilobium adenocaulon, Hordeum jubatum, Impatiens glandulifera, Lactuca serriola, Lepidium densiflorum, Lepidotheca suaveolens, Lupinus polyphyllus, Malus baccata, Medicago sativa, Melilotus officinalis, Oenothera villosa, Pastinaca sativa, Plantago lanceolata, Senecio vulgaris, Solidago сanadensis, Tripleurospermum inodorum, Ulmus pumila. Non-native plants occur at all stages of syngenesis and are of great importance in the formation of the vegetation on dumps. Colonophytes-agriophytes and epecophytes have a high degree of naturalization: Amoria hybrida (mountain taiga subbelt), Epilobium adenocaulon, Medicago sativa, Melilotus officinalis, Oenothera villosa (mountain taiga subbelt), Pastinaca sativa, Tripleurospermum inodorum, Ulmus pumila (southern forest-steppe subzone).