British NVC community CG7

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NVC community CG7 ("Festuca ovina - Hieracium pilosella - Thymus praecox/pulegioides" grassland) 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 (community CG2).

It is a comparatively widely distributed community. There are five subcommunities.

Community composition

The following constant species are found in this community:
* Sheep's Fescue ("Festuca ovina")
* Mouse-ear Hawkweed ("Hieracium pilosella")
* Rough Hawkbit ("Leontodon hispidus")
* Wild Thyme ("Thymus praecox") / Large Thyme ("T. pulegioides")
* Cypress-leaved Plait-moss ("Hypnum cupressiforme")

The following rare species are also associated with the community:
* Field Wormwood ("Artemisia campestris")
* Purple Milk-vetch ("Astragalus danicus")
* Rare Spring-sedge ("Carex ericetorum")
* Wall Bedstraw ("Galium parisiense")
* Lizard Orchid ("Himantoglossum hircinum")
* Hutchinsia ("Hornungia petraea")
* Bur Medick ("Medicago minima")
* Sickle Medick ("Medicago falcata")
* Sand Lucerne ("Medicago sativa" ssp. "varia")
* Fine-leaved Sandwort ("Minuartia hybrida")
* Purple-stem Cat's-tail ("Phleum phleoides")
* Spring Cinquefoil ("Potentilla neumanniana")
* Sand Catchfly ("Silene conica")
* Spanish Catchfly ("Silene otites")
* Breckland Thyme ("Thymus serpyllum")
* Spiked Speedwell ("Veronica spicata")
* Spring Speedwell ("Veronica verna")
* 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 (also on chalk), and on Carboniferous limestone in Derbyshire and Mendip Hills.

ubcommunities

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

References

* Rodwell, J. S. (1992) "British Plant Communities Volume 3 - Grasslands and montane communities" ISBN 0-521-39166-0 (hardback), ISBN 0-521-62719-2 (paperback)

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