Formations of heavy metal soils of the alpine and subalpine levels of the Alps and the Pyrenees, with, among others, Dianthus sylvestris, Galium anisophyllon, Poa alpina, Armeria arenaria, Thlaspi caerulescens, and the very restricted southern Alpine endemic Viola dubyana; they descend to the montane level and occur in some dealpine stations.