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British NVC community MG4 (Alopecurus pratensis - Sanguisorba officinalis 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 community, although widespread in the past, now has a scattered distribution in the Midlands and southern England. One rare species rare species is associated with this community: snake's-head fritillary (Fritillaria meleagris) and six rare micro-species of dandelion, Taraxacum fulgidum, T. haematicum, T. melanthoides, T. sublaeticolor, T. subundulatum and T. tamesense.

There are four subcommunities.

Subcommunities
The Cock’s-foot sub-community is the most species-rich of the four sub-communities and is generally found where the water table remains low throughout the growing season and flooding is rare. Distinguishing species that are constant include cock’s-foot (Dactylis glomerata) and yellow oat-grass (Trisetum flavescens). Meadow foxtail, (Alopecurus pratensis) which is included in the scientific name for the overall community is found only sparsely and patchily in this sub-community.
 * the Dactylis glomerata subcommunity


 * the Typical subcommunity

The Typical sub-community, as its name implies, describes those stands closest in their species composition to the Burnet floodplain meadow community as a whole. However, stands of the Typical sub-community are less species-rich than those of the Cock’s foot sub-community, with on average 22 species per square metre, and there are no strongly preferential species

The Yorkshire fog sub-community has a high cover of grasses such as meadow foxtail (Alopecurus pratensis), rough-stalked meadow-grass (Poa trivialis) and creeping bent (Agrostis stolonifera). It tends to be associated with sites which experience a high water table for longer periods during the growing season than the two preceding sub-communities. It is less species-rich than the Cock’s-foot and Typical sub-communities.
 * the Holcus lanatus subcommunity

The Creeping bent sub-community is the most species-poor. It tends to be associated with areas that experience prolonged inundation (which can also lead to higher soil fertility) and is especially characteristic of the Derwent Ings in Yorkshire.
 * the Agrostis stolonifera subcommunity

Community composition
The following constant species are found in this community:


 * Meadow foxtail (Alopecurus pratensis)
 * Common mouse-ear (Cerastium fontanum)
 * Crested dog's-tail (Cynosurus cristatus)
 * Red fescue (Festuca rubra)
 * Meadowsweet (Filipendula ulmaria)
 * Yorkshire-fog (Holcus lanatus)
 * Meadow vetchling (Lathyrus pratensis)
 * Autumn hawkbit (Leontodon autumnalis)
 * Perennial rye-grass (Lolium perenne)
 * Ribwort plantain (Plantago lanceolata)
 * Meadow buttercup (Ranunculus acris)
 * Common sorrel (Rumex acetosa)
 * Great burnet (Sanguisorba officinalis)
 * Dandelion (Taraxacum officinale agg.)
 * Red clover (Trifolium pratense)
 * White clover (Trifolium repens)