Boreal herb-rich calcicline snowbed communities

Herb-rich and often mosaic patterned snow-patch or near snow-patch communities of alpine levels of boreal and arctic Scandinavia, of the lower alpine belt of Iceland, of the Scottish Highlands and of the English Lake District, with many moss species and few lichens, occurring on calcareous, nutrient-rich, humid substrates. Characteristic species include [Ranunculus acris], [Poa alpina], [Poa arctica], [Saxifraga oppositifolia], [Silene acaulis], [Oxyria digyna], [Potentilla crantzii], [Cerastium alpinum], [Polygonum viviparum] ([Bistorta vivipara]), [Saussurea alpina], [Primula stricta], [Viola biflora], [Carex norvegica], [Minuartia biflora], [Thalictrum alpinum].