Pinus uncinata forests of the inner Alps, of the western outer Alps and the Jura, and of Pyrenean adrets, accompanied by a shrubby undergrowth in which Rhododendron ferrugineum is absent or rare, while Juniperus nana, J. hemisphaerica, Arctostaphylos uva-ursi, A. alpina, Erica herbacea, Rhododendron hirsutum, Cotoneaster integerrimus, Daphne striata, Dryas octopetala or Polygala chamaebuxus may be prominent.