Snow grass snowbed communities

Sparse communities of the alpine level of northern boreal and arcto-alpine mountains of Scandinavia and of Iceland dominated by the grass [Phippsia algida], with, notably, [Salix herbacea], [Cerastium arcticum], [Cerastium cerastoides], [Oxyria digyna], [Ranunculus glacialis], [Ranunculus nivalis], [Ranunculus pygmaeus], [Saxifraga cernua], [Saxifraga oppositifolia], [Saxifraga rivularis], [Saxifraga stellaris], [Saxifraga tenuis], [Carex lachenalii], [Juncus biglumis], [Poa alpina f. vivipara], [Deschampsia alpina], [Sagina saginoides], with a fragmentary moss cover and no lichens, located on gravelly, sandy, sometimes totally waterlogged soils, calcareous in Scandinavia, with prolonged snow-cover. Snow grass communities frequently occur as pioneer vegetation on small surfaces, very common in the central part of southern Norway and in Sweden from Jamtland northwards.