Home – Home – Jornals – Flora and Vegetation of Asian Russia 2023 number 4

18 basic steppe units have been identified in Tyva, they represent widespread typical steppe communities. Within the framework of floristic classification, they refer to 16 associations and 3 subassociations of classes Cleistogenetea squarrosae and Stipetea glareosae-gobicae. Within the framework of phytocоenotic classification, the main types of steppe communities have been included into 29 formations, 15 groups of formations from 4 classes of formations: meadow, bunchgrass, desert and cryophytic steppes. No full compliance of associations of floristic classification and units of any one hierarchical level of phytocoenotic classification has been found. The phytocoenotic characteristics of basic steppe types provide information about the floristic features, structure, and species richness of following units: meadow steppes, tussock steppes, bunchgrass steppes with Carex pediformis, petrophytic bunchgrass steppes, bunchgrass steppes, desert steppes with Nanophyton grubovii, desert steppes with Stipa glareosa, desert steppes with Stipa orientalis. The prodromus of the steppes of Tyva has been compiled, a brief description of all units of floristic classification and description of 1 new alliance and 7 new associations have been given.