Montane siliceous cliff and rock communities of the Cévennes, the eastern and central Pyrenees and the Catalonian hills, with Asarina procumbens (Antirrhinum asarina), Sedum hirsutum, Centaurea pectinata, Sempervivum arvernense, Dianthus graniticus, Saxifraga clusii, Saxifraga hypnoides.