Abstract
The first inventory of alien species in the Republic of Mordovia was in 2000. The article provides information on changes in the species composition, as well as the taxonomic and typological structures of the region's alien flora that have occurred for 20 years. The enrichment of the flora with new species was revealed. Introduction (cultivation) has become more significant for increasing the number of alien species. The role of the transport routes in the dispersal of alien species has increased. From natural habitats, fragments of meadow steppe, reservoirs and swamps were relatively stable in the colonization of new alien species. The analysis of the lists of species in 2000 and 2020 was carried out for changes in the degrees of naturalization. The corresponding examples of views are given in the article.
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