Sparsely vegetated weathered rock and outcrop habitats

Rocks and outcrops colonised by pioneer communities, especially of Crassulaceae. Vegetation of the alliance Sedo-Scleranthion biennis. Substrates are mostly siliceous, occurring in the upland and montane levels of the nemoral zone. The communities are dominated by succulent [Sempervivum], [Jovibarba] and [Sedum] species accompanied by Silene rupestris, Erophila verna, Scleranthus polycarpos, Veronica fruticans, Thymus praecox ssp. polytrichus, Viola tricolor ssp. saxatilis, by small crucifers, lichens and mosses Polytrichum piliferum and Racomitrium canescens.

Código Eunis 2021: R122