A total of 78 species of alien neophytes from 71 genera and 61 families have been registered in the flora of «Pleshcheyevo Lake» National Park, that is 9.5 % of the total flora composition. The group of invasive species includes 34 species, 2 species are potentially invasive. The invasive activity of most species is low (index is 1–2) and is reduced to colonization of anthropogenically transformed, semi-natural and natural habitats. The analysis of the main directions of alien and invasive species spread in a specially protected natural area in Yaroslavl region, presented in this work, can be a background for providing monitoring research.

M.A. Borisova, O.A. Marakaev