Pinus uncinata forests of calcareous Pyrenean adrets with Arctostaphylos uva-ursi, Juniperus nana, J. hemisphaerica, Cotoneaster integerrimus, Rhamnus alpina, 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.