British NVC community CG7
NVC community CG7 is one of the calcicolous grassland communities in the British National Vegetation Classification system. It is one of three short-sward communities associated with heavy grazing, within the lowland calcicolous grassland group, and is regarded as the eastern counterpart of "typical" chalk grassland.
It is a comparatively widely distributed community. There are five subcommunities.
Community composition
The following constant species are found in this community:The following rare species are also associated with the community:
- Field Wormwood
- Purple Milk-vetch
- Rare Spring-sedge
- Wall Bedstraw
- Lizard Orchid
- Hutchinsia
- Bur Medick
- Sickle Medick
- Sand Lucerne
- Fine-leaved Sandwort
- Purple-stem Cat's-tail
- Spring Cinquefoil
- Sand Catchfly
- Spanish Catchfly
- Breckland Thyme
- Spiked Speedwell
- Spring Speedwell
- Side-fruited Crisp-moss Pleurochaeta squarrosa
- the lichen Bacidia muscorum
- the lichen Buellia epigaea
- the lichen Diploschistes scrupsos var. bryophilus
- the lichen Fulgensia fulgens
- the lichen Lecidea decipiens
- the lichen Squamaria lentigera
- the lichen Toximia caerulea var. nigricans
- the lichen ''Toximia lobulata''
Distribution
This community is found scattered throughout chalk grassland sites in southern England, particularly in The Brecks on the Norfolk/Suffolk border, with outlying clusters in the Yorkshire Wolds, and on Carboniferous limestone in Derbyshire and Mendip Hills.Subcommunities
There are five subcommunities:- the Koeleria macrantha subcommunity
- the Cladonia spp. subcommunity
- the Ditrichum flexicaule - Diploschistes scruposus var. bryophilus subcommunity
- the Fragaria vesca - Erigeron acer subcommunity
- the 'Medicago lupulina - Rumex acetosa'' subcommunity'''