Floristic diversity is part of the overall biodiversity of the area and is associated with its sustainability. At present, there are several views on the classification of biodiversity due to the rather large number of its forms. The dependence of the species richness of flora on various factors was studied in a number of works. The influence of geographic factors on the species diversity of flora within the Soksky physiographic region of the forest-steppe zone (part of the province of the High Transvolga, Samara Region) is analyzed.