Communities with Orostachys thyrsiflora (Crassulaceae DC.) in syntaxa system of steppe vegetation of South Ural

The results of geobotanic investigation of communities with South Ural rare species - Orostachys thyrsiflora Fisch are presented. Two new points of species growth were found in the region. Community features and their location in floristic classification of steppe vegetation were identified according with syntaxonomical and ordination analysis. It was demonstrated, that O. thyrsiflora including communities differ very petrophytic floristic composition and apply to the most dry steppes in the region.