Very open, low formations of annuals and perennials of Mediterranean, thermo-Atlantic and Black Sea gravel and shingle beaches, occupying accumulations of drift material, sandy gravels and gravels rich in nitrogenous organic matter; characteristic are Cakile maritima ssp. aegyptiaca, Cakile maritima ssp. euxina, Enarthrocarpus arcuatus, Matthiola sinuata, Matthiola tricuspidata, Salsola kali, Atriplex spp., Polygonum spp., Euphorbia peplis, Euphorbia paralias, Glaucium flavum, Eryngium maritimum.