In the spontaneous flora of the V.N. Rzhavitin Botanical Garden, 31 wild inroducents from 27 genera and 13 families were identified, which is 7 % of the total number of cultivated tree species. The greatest tendency towards naturalization is shown by immigrants from North America and the Far East (12 and 8 species, respectively). Species of the Rosaceae family predominate (11 species). Some species have already become firmly part of the spontaneous flora (Acer negundo L., Physocarpus opulifolius (L.) Maxim., Parthenocissus inserta (A. Kern.) Fritsch, Lonicera tatarica L., Fraxinus pennsylvanica Marsh., Cornus alba L.), others – while maintaining current trends towards naturalization, will replenish its composition in the future.

I.V. Kiryukhin, T.B. Silaeva, S.V. Aparin, A.D. Glukhova