Formations, predominantly of annuals, occupying accumulations of drift material and gravels rich in nitrogenous organic matter on nemoral and boreonemoral beaches of the Atlantic, the North Sea and the Baltic; characteristic are Cakile maritima ssp. maritima, Cakile maritima ssp. baltica, Salsola kali, Atriplex spp. (particularly Atriplex glabriuscula), Polygonum spp., Euphorbia peplis, Mertensia maritima, Glaucium flavum.