British NVC community SD17
# 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
