Perennial communities of the shingle beaches and bars of Brittany, the Cotentin peninsula and Anglesey, dominated by Crambe maritima, with Crithmum maritimum and a sparse representation of other nitrophiles, in particular, Beta vulgaris ssp. maritima, Matricaria maritima, Rumex crispus, Glaucium flavum, Solanum dulcamara var. maritima, Sonchus oleraceus, Galium aparine.