The article discusses the current level of species diversity, structural features and dynamics of the alien fraction of the Bryansk flora. 370 adventive plants have been registered. The analysis of the alien fraction of flora is carried out and conclusions about its dynamics are drawn. There is a significant increase in the share of ergasiophytes, and in terms of the degree of naturalization – that of colonophytes and agriophytes. Over the past 20 years, the phytocenotic amplitude and the rate of spread of many alien plants have expanded.

А.D. Krapivin, N.N. Panasenko