Pioneer formations of typically dwarf annuals, often ephemeral and of very limited extent, characteristic in particular of fixed sands, of Atlantic, sub-Atlantic and supra-Mediterranean Europe, with Aira caryophyllea, Aira praecox, Micropyrum tenellum (Nardurus lachenalii), Vulpia bromoides, Vulpia myuros, Trisetum ovatum, Filago arvensis, Filago gallica, Filago lutescens, Filago minima, Filago pyramidata, Filago vulgaris, Spergula morisonii, Hypochoeris glabra, Evax carpetana, Moenchia erecta, Scleranthus polycarpos, Teesdalia nudicaulis, Myosotis discolor, Myosotis stricta, Linaria elegans, Linaria amethystea, Sedum lagascae, Sedum pedicellatum, Ornithopus perpusillus, Trifolium striatum, Trifolium arvense, Trifolium dubium, Trifolium campestre, Trifolium micranthum, Tuberaria guttata; typical former crop-following species also find a refuge in these communities.