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.
The following constant species are found in this community: No rare species are associated with the community.
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.