Geobotanical classification of desert and semi-desert phytocenoses created by legumes spreading within the Steppe Plateau of Azerbaijan have been given in the paper. More than 170 species of legumes have been revealed in the Steppe plateau, of which 77 are more common, and some play important role in botanical groupings under creating of populations: Glycyrrhiza glabra L., Alhagi pseudoalhagi (Bieb.) Fisch., Medicago minima (L.) Bartalini, M.orbicularis (L.) Bartal., Аstrаgаlus igniаrius Popov, A. caucasicus Pall.and etc. These plants can be considered satellites of associations formed by the predominance of legumes. Groupings created by legumes are classified into 3 formation classes, 6 formations, 6 associations for semi-desert plants, 2 formation classes, 4 formations, 4 associations for desert plants. Legumes are either ecosystem engineers (edificator) or a component in these cenoses