British NVC community MG5 (Cynosurus cristatus - Centaurea nigra grassland) is one of the mesotrophic grassland communities in the British National Vegetation Classification system.
It is one of four such communities associated with well-drained permanent pastures and meadows.
This type of plant community was described in 1952 as Centaureo-Cynosuretum cristati Br.-Bl.
This community is widespread in lowland areas in England, Wales and Scotland, but its abundance varies between regions.
It is uncommon in southern England and East Anglia, for instance, but strong concentrations occur in the Midlands and Yorkshire.