This association includes communities of succulents, mainly Sedum album and S. acre, and vernal therophytes on limestone and other calcareous rocks. It occurs both on natural rock outcrops as well as in quarries. In contrast to the association Cerastietum, its stands contain more succulents and less therophytes. The association is most common in colline landscapes of northern and central Bohemia and southern Moravia, but isolated occurrences are also found in other areas with warm, dry climate.