British NVC community OV18

British NVC community OV18 (Polygonum aviculare - Chamomilla suavolens community) is one of the open habitat communities in the British National Vegetation Classification system. It is one of six communities characteristic of gateways, tracksides and courtyards.

This community is found throughout the lowlands and upland fringes of Britain on loamy and sandy soils that are disturbed or moderately trampled.

There are two subcommunities.

Community composition

The following constant species are found in this community:

Shepherd's-purse (Capsella bursa-pastoris)
Scented mayweed (Matricaria chamomilla) (syn. Chamomilla suavolens)
Perennial rye-grass (Lolium perenne)
Annual meadow-grass (Poa annua)
Knotgrass (Polygonum aviculare)

There are no rare species associated with the community.

Distribution

This ephemeral community is widely distributed throughout the lowlands and upland fringes of Britain. It occurs on loamy and sandy soils that are subjected to disturbance and moderate trampling, such as around tracks and gateways on agricultural land, on wasteland, and in recreational areas. Where trampling is heavier, it is replaced by the Poa annua - Plantago major community, OV21.

Subcommunities

There are two subcommunities:

the Sisymbrium officinale - Polygonum arenastrum subcommunity
the Plantago major subcommunity

References

Rodwell, John S (ed) (March 2000). Maritime communities and vegetation of open habitats. British Plant Communities. vol 5. Cambridge University Press. ISBN 978-0-521-39167-2. doi:10.2277/0521391679.

The British National Vegetation Classification: Vegetation of open habitats
OV1 OV2 OV3 OV4 OV5 OV6 OV7 OV8 OV9 OV10 OV11 OV12 OV13 OV14 OV15 OV16 OV17 OV18 OV19 OV20 OV21 OV22 OV23 OV24 OV25 OV26 OV27 OV28 OV29 OV30 OV31 OV32 OV33 OV34 OV35 OV36 OV37 OV38 OV39 OV40 OV41 OV42

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