Terminology used in connection with the British National Vegetation Classification
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The following is a list of terms used in connection with the British National Vegetation Classification, together with their meanings:
A community is the fundamental unit of categorisation for vegetation.
A constant species in a community is a species that is always present in any given stand of vegetation belonging to that community.
A list of the constant species, and the NVC communities in which they are present, is at List of constant species in the British National Vegetation Classification.
A rare species is a species which is associated with a particular community, and is rare nationally. The sources used by the authors of British Plant Communities for assessing rarity were as follows.
a) for vascular plants, two sources were used:
- Perring, F.H. and S. M. Walters (1962) Atlas of the British Flora - a species was regarded as rare is it was given an "A" rating in this work (these were plants which Perring & Walters judged to be sufficiently rare to merit a special search in order to ensure all records were included in the atlas).
- any species included on lists compiled by the Nature Conservancy Council of plants found in less than 100 hectads.
b) for bryophytes, the source used was Corley, M. F. V. & M. O. Hill (1981) Distribution of bryophytes in the British Isles. This lists the species and the vice-counties in which they are recorded; presence in under 20 vice-counties was the criterion used for selection as rare.
c) for lichens, no source was available, and the authors used their own selection of species.
A list of these rare species, and the NVC communities in which they are present, is at List of rare species in the British National Vegetation Classification.
A subcommunity is a distinct recognisable subdivision of a community.
A variant is a further subdivision of a subcommunity.
Woodlands and scrub: W1 * W2 * W3 * W4 * W5 * W6 * W7 * W8 * W9 * W10 * W11 * W12 * W13 * W14 * W15 * W16 * W17 * W18 * W19 * W20 * W21 * W22 * W23 * W24 * W25
Mires: M1 * M2 * M3 * M4 * M5 * M6 * M7 * M8 * M9 * M10 * M11 * M12 * M13 * M14 * M15 * M16 * M17 * M18 * M19 * M20 * M21 * M22 * M23 * M24 * M25 * M26 * M27 * M28 * M29 * M30 * M31 * M32 * M33 * M34 * M35 * M36 * M37 * M38 * Heaths: H1 * H2 * H3 * H4 * H5 * H6 * H7 * H8 * H9 * H10 * H11 * H12 * H13 * H14 * H15 * H16 * H17 * H18 * H19 * H20 H21 * H22
Mesotrophic grasslands: MG1 * MG2 * MG3 * MG4 * MG5 * MG6 * MG7 * MG8 * MG9 * MG10 * MG11 * MG12 * MG13 * Calcicolous grasslands: CG1 * CG2 * CG3 * CG4 * CG5 * CG6 * CG7 * CG8 * CG9 * CG10 * CG11 * CG12 * CG13 * CG14 * Calcifugous grasslands and montane communities: U1 * U2 * U3 * U4 * U5 * U6 * U7 * U8 * U9 * U10 * U11 * U12 * U13 * U14 * U15 * U16 * U17 * U18 * U19 * U20 U21
Aquatic communities: A1 * A2 * A3 * A4 * A5 * A6 * A7 * A8 * A9 * A10 * A11 * A12 * A13 * A14 * A15 * A16 * A17 * A18 * A19 * A20 A21 * A22 * A23 * A24
Swamps and tall-herb fens: S1 * S2 * S3 * S4 * S5 * S6 * S7 * S8 * S9 * S10 * S11 * S12 * S13 * S14 * S15 * S16 * S17 * S18 * S19 * S20 S21 * S22 * S23 * S24 * S25 * S26 * S27 * S28
Saltmarshes: SM1 * SM2 * SM3 * SM4 * SM5 * SM6 * SM7 * SM8 * SM9 * SM10 * SM11 * SM12 * SM13 * SM14 * SM15 * SM16 * SM17 * SM18 * SM19 * SM20 SM21 * SM22 * SM23 * SM24 * SM25 * SM26 * SM27 * SM28
Shingle, strandline and sand-dunes: SD1 * SD2 * SD3 * SD4 * SD5 * SD6 * SD7 * SD8 * SD9 * SD10 * SD11 * SD12 * SD13 * SD14 * SD15 * SD16 * SD17 * SD18 * SD19
Maritime cliff communities: MC1 * MC2 * MC3 * MC4 * MC5 * MC6 * MC7 * MC8 * MC9 * MC10 * MC11 * MC12
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
Full list of communities * Terminology * British Plant Communities * List of constant species * List of rare species
