British NVC community OV4 (Chrysanthemum segetum - Spergula arvensis community) is one of the open habitat communities in the British National Vegetation Classification system. It is one of six arable weed and track-side communities of light, less-fertile acid soils. It is widely distributed, and there are two subcommunities. Community composition The following constant species are found in this community: Corn marigold (Chrysanthemum segetum) Annual meadow-grass (Poa annua) Knotgrass (Polygonum aviculare) Corn spurrey (Spergula arvensis) No rare species are associated with the community. Distribution This is a widely distributed community, most commonly found in western Britain. Subcommunities The two subcommunities are: the so-called typical subcommunity the Ranunculus repens - Sonchus asper subcommunity References OV04