Pinus uncinata forests of calcareous Pyrenean on sunny slopes (adrets) with Arctostaphylos uva-ursi, Juniperus nana, Juniperus hemisphaerica, Cotoneaster integerrimus, Rhamnus alpinus, Amelanchier vulgaris, Dryas octopetala and a predominantly calciphilous herb layer comprising Festuca gautieri, Valeriana montana, Teucrium pyrenaicum, Hepatica nobilis, Hippocrepis comosa, Polygala calcarea, Sesleria caerulea, Helectotrichon sedenense (Avena montana), Primula suaveolens.