This association is dominated by Digitalis purpurea, a western European herb which is probably alien to the Czech Republic. D. purpurea has spread especially in north-western Bohemia since the 19th century. This vegetation occurs on deforested acidophilous beech forest or spruce plantation sites. Soils are wet to mesic with low pH. It is distributed mainly in the submontane to montane belts of the climatically oceanic areas of Bohemia.