NVC community SD17 (Potentilla anserina - Carex nigra dune-slack community) is one of the 16 sand-dune communities in the British National Vegetation Classification system.
It is one of five communities associated with dune slacks.
It is a very localised community. There are four subcommunities.
Community composition
The following constant species are found in this community:
Creeping Bent (Agrostis stolonifera) Common Sedge (Carex nigra) Silverweed (Potentilla anserina) Pointed Spear-moss (Calliergon cuspidatum)
No rare species are associated with the community.
Distribution
This community is found in two areas - on the east coast, from Spurn Point to northwest Norfolk, and on the dunes of Liverpool Bay.And north Wales.
Subcommunities
There are three subcommunities: the Festuca rubra - Ranunculus repens subcommunity the Carex flacca subcommunity the Caltha palustris subcommunity the Hydrocotyle vulgaris - Ranunculus flammula subcommunity
References
Rodwell, J. S. (2000) British Plant Communities Volume 5 - Maritime communities and vegetation of open habitats (hardback), (paperback)