Pinus rotundata (P. uncinata s.l., "P. mugo") woods (var. arborea) or scrubs (var. pseudopumilio) of bogs in the Alps and peri-Alpine areas, the Jura and the higher Hercynian ranges, with Eriophorum vaginatum, Vaccinium oxycoccos, V. uliginosum, V. myrtillus, Sphagnum spp. and sometimes Betula nana.