Expansion of the arctogeic element of flora into the boreal region (on the example of Okhotia)

On the example of arctic and arctoalpine species of the sedge family (Cyperaceae Juss.), willow family (Salicaea Mirb.), saxifrage family (Saxifragaceae Juss.), buttercup family (Ranunculaceae Juss.) and rose family (Rosaceae Juss.) new points of their settlement in the subarctic mountain structures of Priokhotye are shown. The ecological adaptations of arctogenic element species to existence in mountainous conditions of low temperatures and high water content of habitats (nival lawns, the outskirts of ice crust fields, key bogs, etc.) are considered. This made it possible to clarify the main ways of arctic and arctic-alpine species dispersal in the subarctic mountain systems of the Boreal region.