Распространение краеареальных видов растений в Среднем Поволжье

Abstract

Summary. In the flora of Middle Volga region are revealed 518 species of vascular plants which are on borders of the continuous distribution. The characteristic of their distribution on physiographic provinces is provided. Distribution of vascular plant species in the Middle Volga region allows us to trace of zonal differences of the flora of Predvolzhye and Zavolzhye Forest-steppe from Zavolzhye Steppe, to more fully characterize the native biota of the forest-steppe ecotone and indicates the boundary position of region on the border of Pribalto-Volgo-Dneprovskii (Volgo-Donskoi area) and Vostochnyi (Zavolzhskii area) districts of European Botanical and Geographical province.