Low-altitude middle European xerophile, rupicolous or psammophilous, grasslands of slightly calcareous substrates, with Festuca heteropachys, Festuca trachyphylla, Koeleria macrantha (Koeleria gracilis), Phleum phleoides, Luzula campestris, Dianthus deltoides, Jasione montana, Agrostis tenuis, Potentilla erecta, Armeria elongata, Artemisia campestris, Aster linosyris, Lychnis viscaria, Silene otites, Silene nutans, Chamaespartium sagittale, Campanula patula, Potentilla rupestris, Helianthemum nummularium ssp. obscurum, Helianthemum apenninum, Scleranthus perennis, Allium senescens ssp. montanum.
Rupicolous communities, colonizing, in particular, deep cracks and ledges of calcaro-siliceous rocky slopes or cliffs, with, notably, Festuca heteropachys, Artemisia campestris, Aster linosyris, Lychnis viscaria, Potentilla rupestris. The range of these formations is centreed on the Hercynian ranges of middle Germany (notably Rhine, Nahe, Moselle, Mainz valleys and Hartz periphery), extending east to the Bohemian basin, west to Alsace and to extremely rare and isolated outposts in Ardenne valleys of Luxembourg, Belgium and France, where they are represented by Festuca heteropachys or Potentilla rupestris grasslands.