Montane and lower subalpine Pinus sylvestris or Pinus sylvestris and Pinus uncinata forests of dry sunny slopes (adrets) of the southern flanks of the Pyrenees and of the Val d'Aran, with a shrub layer comprising Juniperus hemisphaerica, Cytisus purgans, Buxus sempervirens and an herb layer dominated by Deschampsia flexuosa, accompanied by, among others, Veronica officinalis.