The coenopopulations of Hedysarum grandiflorum Pall. in the southern Volga Upland within the administrative boundaries of the Saratov region were studied for the first time. The relief, parent rocks and soils in their habitats were characterized. Main environmental scales were supplemented by new data. Tolerance amplitudes by vital environmental factors were revealed. Adaptation features of this species to its environment are presented. H. grandiflorum is shown to be a quite stenobiontic species.