Additions to the classification of steppe vegetation of the North Caucasus

Based on the approach of J. Braun-Blanquet a new subassociation Euphorbio glareosae-Botriochloetum ischaemi helianthemetosum ciscaucasicae subass. nov. and a new variant Euphorbio glareosae-Botriochloetum ischaemi caraganetosum grandiflorae var. Berberis vulgaris was established. They characterize the steppe vegetation of the North Caucasus and are assigned to the Euphorbio glareosae-Botriochloetum ischaemi association, Stipo caucasicae-Salvion canescentis alliance, Galio biebersteinii-Bilacunarietalia microcarpae order of the Festuco-Brometea class.