Brachypodium pinnatum ssp. pinnatum or Brachypodium pinnatum ssp. rupestre facies of unit E1.262. Geographical subdivisions are given by level 6 units E1.2621 - E1.262L . Brachypodium-dominated facies may form in all the regional types of grasslands inventoried in unit E1.262 as a result of nitrification or of dominance of grazing over mowing. Such processes are accompanied by a drastic reduction in species diversity. South western grasslands of sub units H to K of E1.262 and of E1.263 are, however, generally rich in Brachypodium even in the apparent absence of degradation processes.