Phytocoenotic Connections of the Invasive Species Festuca trachyphylla (Hack.) Krajina (Poaceae) in the Secondary Range in Tula Oblast

This article characterizes phytocoenotic connections and discusses the geographical features of plant communities formed by Festuca trachyphylla (Hack.) Krajina within the secondary range in Tula oblast. Compared with their Central European counterparts, these communities of the secondary range have a geographical peculiarity, which made it possible to unite them into the new association Achilleo nobilis–Festucetum trachyphyllae ass. nov. Its coenoflora is characterized by the greatest continental character among all the compared syntaxa, which is associated with the loss of some suboceanic species common to Central European communities and enrichment in subcontinental ones when moving to the southeast in Europe.