Siliceous cliff and rock communities of the northwestern, northern, eastern and central Alps, the Pyrenees, the western Carpathians, the middle European Hercynian ranges, the Jura. Vegetation of alliances Androsacion vandelii, Asplenion septentrionalis and Hypno-Polypodion vulgaris, with the most typical species Acetosella vulgaris, Aurinia saxatilis, Polypodium vulgare, Woodsia ilvensis, Primula minima, Ranunculus alpestris, Saxifraga bryoides, Silene acaulis.