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Objective – to identify the plant species of the Red Book of Ukraine and the official list of rare plants of the Chernigiv Region in the flora of dendropark Trostjanets, the autphytosozologyсal characteristic and clarification of the nature of distribution on the territory of the dendropark. Material and methods. The object of investigation were species of the Red Book of Ukraine and official list of rare plants of the Chernigiv Region. The list of rare species is based on inventory date of 2005–2012. Results. There are 23 species of rare plants (10 tree and 13 herbaceous species), 10 species of which are listed in the Red Book of Ukraine, 10 – in the list of rare plants of the Chernihiv Region, 3 – in the Red Book of Ukraine and the list of regionally rare plants. Species of flora of the dendropark, listed in the Red Book of Ukraine, have such nature protection categories: endangered species – 3 (Hedysarum ucraіnіcum Kaschm., Spiraea polonica Blocki, Tіlіa dasystyla Steven), vulnerable – 5 (Euonymus nana Beeb., Festuca heterophylla Lam., Juniperus excelsa M.Bied., Pinus cembra L., Taxus baccata L.), rare – Betula obscura A. Kotula, unvalued – 4 species (Adonis vernalis L., Carex umbrosa Host, Galanthus nіvalіs L., Glycyrrhіza glabra L.). Conclusion. On the territory of the dendropark 14 species have unique locality (Adonis vernalis, Juniperus excelsa, Galanthus nivalis, Glycyrrhiza glabra, Hypericum montanum L., Hedysarum ucrainicum, Potentilla alba L., Centaurium erythraea Rafn, Scilla bіfolia L ., Carex lіmosa L., Tіlіa dasystyla, Spіraea polonіca, Cerasus frutіcosa Pall. and Euonymus nana). Rare species are Alnus іncana (L.) Moench, Anemone sylvestrіs L., Betula obscura, Carex umbrosa, Fragarіa moschata Duch., Pinus cembra, Taxus baccata, often – Junipers communis L., everywhere – Festuca heterophylla.

The correct choice of criteria of objective estimation of success of introduction – the one of relevant questions in introduction investigations. The results of estimations with the use of existing, at present, methodologies in which a preference gives to the criteria of stability, are indicative of very high degree of success of introduction for most species. However comparison of vital factors of introducents in natural habitats and in the areas of introduction, not always confirms these estimations. The height of plants as well as maximum age within the areal, often are bigger than in the area of introduction, although introducent tolerates well the climatic terms of these area. This fact put in a question reasonability of choice as a criterion of estimation of success of introduction of stability of introducents and it is required, undoubtedly, the deeper analysis of expediency of the use for this purpose one or another figures. In the article, from position of systemic approach and theory of adaptive strategy of plants it is founded, that the objective final estimation of success of introduction it is possible only by using as criteria of output parameters of the system plant–environment (figures of the vegetative and seminal productivity, maximum age and other endpoint of vital functions of plant). The main argument of pointlessness, using of any form of stability as a criterion of final estimation is ambiguousness and unforeseeable of its display as a consequence of direct dependence on duration and intensity of influence by negative factors of environments that constantly and not always change by forecasting. To obtain the comparable estimations for the plants of different systematic belonging or plants within same species in different regions the evaluation parameters received from introduction area must be expressed in relative figures, and correlated with parameters in a natural habitat.

The long-term experience of artificial renewal of wood plants in the Dendropark Trostyanets is generalized. The analysis of survival rate of plantings in terms of an areal of taxon distribution and landscape area of park has been done. It is shown that the artificial renewal, conducted during last decades, does not provide a stable level of number of wood plants in the park.