Fixed dunes of the western and central Mediterranean and of the thermo-Atlantic coasts of Portugal, southwestern Spain and North Africa, colonised by communities mostly composed of fruticose species, with Crucianella maritima, Artemisia crithmifolia, Armeria pungens, Armeria welwitschi, Helichrysum decumbens, Helichrysum italicum, Teucrium spp., Ephedra distachya, Pancratium maritimum and Ononis natrix ssp. ramosissima. Communities of Crucianellion maritimae and Ononidion ramosissimae.