Hierarchical clustering resulting from Modified TWINSPAN analysis. Cluster 1) Fagus sylvatica woodlands; 2) Amelanchier ovalis forest edges; 3) Saxifraga callosa chasmophytic vegetation; 4) Cynosurus cristatus hay meadows; 5) Bromopsis erecta montane grasslands; 6) Iris marsica community; 7) Rumex scutatus screes vegetation; 8) Paronychia kapela rocky outcrops vegetation; 9) upper-montane grasslands, including also the Brachypodium genuense community and the Astragalus sempervirens community; 10) chamaephytes-rich dry grasslands.