Central European species in the flora of Tver region at the turn of XIX-XX centuries

In connection with the interest in the study of polemochores discusses the problem of distribution of Central European species in flora of Tver region at the turn of the XIX and XX centuries is under the discussion. Manor parks have played an important role in enriching the regional alien flora by Central European plants what is confirmed by the results of our studies. The emergence as a result of accidental drifts of some species is documented.