Communities of the montane and subalpine levels of high and moderately high mountains of the Alpine system and neighbouring ranges, dominated by tall grasses, accompanied by a species cortège similar to that of the subalpine tall-herb communities. They are bound to both siliceous and carbonate substrates. Characteristic species: Calamagrostis arundinacea, Calamagrostis villosa, Deschampsia cespitosa. In the Carpathians they are represented by a very high number of associations included in the alliances Calamagrostion villosae, Trisetion fusci, Festucion carpaticae and Calamagrostion arundinaceae.