British NVC community SD17

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