This association includes former forest pastures dominated by tall stands of Quercus robur. Their shrub layer is sparse, whereas the herb layer is well developed and species-rich. It contains several species adapted to an intermittent moisture regime. This association is endemic to lowland sandy plains of southern Moravia (Hodonín region) and adjacent western Slovakia. The sand in this area is acidic, but overlays base-rich clays, which enables the occurrence of calcicoles mixed with acidophytes.