The paper presents modern data on the distribution of Ephedra distachya L. an attempt was made to model the bioclimatic range of the species using the maximum entropy method and compare the obtained data with the range defi ned in the report «Flora of the USSR», taking into account additions from the monographs «Flora of the European Part of the USSR» and «Geography of Trees plants of the USSR». MaxEnt modeling of the potential range of E.
