A comparative analysis of Oenothera's hybrid species was carried out. The genus Oenothera L. (subsect. Oenothera, Onagraceae) is one of the most widespread American genera in Europe. These species possess a special breeding system (permanent translocation heterozygosity) which promotes the hybridiza tion (also introgressive one) among any species resulting in formation of a hybrid with a constant complex of morphological characteristics. The analysis of hybrid species distribution in Europe using published and original data proved the existence of groups with different degrees of invasiveness. A positive correlation between the degree of invasiveness of the parental species and the invasiveness of hybrid ones was shown. As a rule, the aggressive hybrids originated from aggressive parents. The most aggressive hybrids were formed after a crossing of North American with European species; perhaps such hybridization leads to the heterosis effect among normally isolated genes. The invasiveness of morphologically similar hybrids correlates both with their genetic features and with the abundance of the parental species. The new evolution branch of ring forming species of Evening primroses is distinguished by high invasiveness in comparison with bivalent species. The invasiveness of the model species depends on plant cytotypes.

Results of application of different approaches to the data visualization during the study of alien plant species have been analyzed and summarized, and the prospects of their use for different purposes have been evaluated. The existing experience in the study of alien plant species shows that traditional methods used to analyze their composition and distribution patterns in different regions are informative only for determining the main tendencies reflecting global processes of a phytobiota synanthropization. At the same time, new state-of-art methods are required to reveal the latent patterns of plant migration and the processes of their naturalization. The most promising approaches to analyzing large volumes of data are multivariate statistical methods. The potential of these methods is determined by their capability to identify relationships between a wide range of floristic and biological data and environmental characteristics, which can be visualized. These methods allow us to present different data in the form of diagrams reflecting interactions between individual species or whole groups of alien plants and climatic or environmental variables. They make it possible to create models of expansion of invasive species. They reflect the current statistical distances and relationships between different objects of study, which makes it possible to identify features of the group strategy of colonization of various natural and/or technogenic habitats by alien species. These strategies depend mainly on the biological characteristics of species, level of anthropogenic transformation of a regional flora, and environmental parameters.

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