Each family of higher vascular plants demonstrates a certain degree of ecological community. In this paper, the ecological characteristics of families were estimated by the ratio of groups of hygromorphs (ecological groups of species in relation to soil moisture conditions). Hygromorphs are part of the general sys- tem of plant ecomorphs, which was developed by A. L. Belgardas. The characteristics of the families of the flora of Samara region are compiled on the basis of data on 8 groups of hygromorphs. Two main hygromorphic groups of families have been identified for Samara region: “xerophytic” (Brassicaceae, Chenopodiaceae, Asteraceae and Caryophyllaceae) and “mesophytic” (Rosaceae, Scrophulariaceae, Poaceae, Lamiaceae, Fabaceae and Boragi- naceae). In geographically remote florae (Chelyabinsk and Kirov regions as well as the Republic of Mordovia) due to changes in species composition and natural conditions, the hygromorphic characteristics of the leading families of the flora are not com- pletely preserved. The number of species in the “mesophytic” group increases as the amount of precipitation increases in the territory under consideration. All regions, whose flora data are involved for comparative analysis, are located in conditions of stronger moistening. The composition of the “xerophytic” group in geographically remote flora was significantly reduced. However, it should be noted that the same families are similar in relation to each other.