The alliance Aceri tatarici-Quercion includes thermophilous oak forests on base-rich soils in continental areas of east-central and eastern Europe. In the forest-steppe zone of the Ukraine and Russia, these forests are dominated by Quercus robur, but in central Europe also Q. cerris, Q. petraea agg. and Q. pubescens agg. are common constituents of the tree layer. Their herb layer includes a higher number of continental species than in other oak forests, while Submediterranean species are less common. In the Czech Republic this alliance only occurs on gentle slopes or flatland in the dry area of southern Moravia.