Scientific name Juncus acutiflorusHolcus lanatus grassland
Common name Sharp-flowered Rush – Yorkshire-fog grassland
Community code GL1A

 

GL1A: Juncus acutiflorus – Holcus lanatus grassland   GL1A: Juncus acutiflorus – Holcus lanatus grassland   GL1A map: Juncus acutiflorus – Holcus lanatus grassland

Download full pdf synopsis: GL1A

 

Vegetation

Juncus acutiflorus is the main component of this rather rank community, usually forming a tall sward with the other constants, Holcus lanatus, Anthoxanthum odoratum and Agrostis stolonifera. Frequent forbs include Rumex acetosa, Ranunculus repens, Ranunculus acris, Galium palustre, Filipendula ulmaria and Lotus pedunculatus, and these also display robust growth; the latter two species in particular can be abundant. The chief bryophyte is Calliergonella cuspidata, which grows alongside Kindbergia praelonga, Rhytidiadelphus squarrosus and Brachythecium rutabulum.

 

Ecology

This is a wet grassland community of marginal farmland that occurs on mildly acidic, organic gley soils and peats. It is typically found on gently sloping ground in the lowlands. There are usually few signs of agricultural improvement and the soils are relatively infertile.

 

Sub-communities

No sub-communities have been described for this community.

 

Similar communities

The most similar community is the GL1E Juncus acutiflorus Rhytidiadelphus squarrosus grassland but in that community the sward is typically less rank and more diverse. There are also similarities with GL4D Agrostis canina/vinealis Rhytidiadelphus squarrosus grassland but that community contains indicators of dry-humid, upland swards such as Potentilla erecta, Hylocomium splendens and Luzula multiflora. Juncus effusus is frequent in community GL1A but is typically not as abundant as it is in the more mesotrophic wet grasslands of the GL2 Agrostis stoloniferaRanunculus repens group.

 

Conservation value

This is on average a fairly species-poor grassland community, but more diverse examples may qualify as EU HD Annex I habitat 6410 Molinia meadows.

 

Management

These swards are managed as rough grazing land (typically for cattle). The main threats to these grasslands include improvement, abandonment and afforestation.