Communities of more calcareous, drier soils and warmer exposure characteristic of the Quercion pubescenti-petraeae and of xeric, calciphilous forms of the Carpinion, with, among others, Prunus spinosa, Ligustrum vulgare, Viburnum lantana, Cornus mas, Rhamnus catharticus.
Communities with Prunus mahaleb, Acer monspessulanum and other xero-thermophile species, occupying the southern part of the west European range of the unit as well as a few highly xero-thermic central European sites.