British NVC community OV9 (Matricaria perforata - Stellaria media community) is one of the open habitat

Vegetation of open habitats in the British National Vegetation Classification system

This article gives an overview of the plant communities formed by vegetation of open habitats in the British National Vegetation Classification system.-Introduction:...

 communities in the British National Vegetation Classification

British National Vegetation Classification

The British National Vegetation Classification or NVC is a system of classifying natural habitat types in Great Britain according to the vegetation they contain....

 system. It is one of eight arable weed and wasteland communities of fertile loams and clays.

It is a widely-distributed community. There are four subcommunities.

Community composition

The following constant species are found in this community:

• Scentless mayweed (Matricaria perforata)
• Knotgrass (Polygonum aviculare
  Polygonum aviculare
  Polygonum aviculare or Common Knotgrass is a plant related to buckwheat and dock. It is also called birdweed, pigweed and lowgrass. It is an annual found in fields and wasteland, with white flowers from June to October....
  
  )
• Common chickweed (Stellaria media)

No rare species are associated with the community.

Distribution

This is a widely distributed community, found throughout the British lowlands on disturbed, well-drained ground.

Subcommunities

There are four subcommunities:

• the Anagallis arvensis - Viola arvensis subcommunity
• the Poa annua - Galeopsis tetrahit subcommunity
• the Elymus repens - Potentilla anserina subcommunity
• the Bilderdykia convolvulus - Veronica persica subcommunity