Dwarf oligo-mesotrophic annual communities of recently emerged muds and sands of the nemoral, boreonemoral and boreal regions. Terrestrial forms of amphibious species and annual species are frequent. A dynamic habitat, and several aspects can occur during the vegetation cycle. If the substrate is sufficiently wet, and also in advanced successional stages, the moss layer is abundant. Typical species are Juncus bufonius, Cyperus fuscus, Cyperus flavescens and other species from vegetation of class Isoeto-Nanojuncetea.
Associations, often very limited in extent, appearing in the drying phase of temporary pools, flooded ruts of forest paths, wet heath paths, humid forest cuts, seeping mowed lawns and other sufficiently lit temporarily inundated, most often acidic, soils of nemoral, boreonemoral, boreal, and, locally, steppic, Palaearctic Eurasia, characterised by Juncus bufonius, Scirpus setaceus, Cyperus flavescens, Centunculus minimus, Spergularia segetalis, Centaurium pulchellum, Blackstonia perfoliata, Samolus valerandi, Cicendia filiformis, Radiola linoides and Illecebrum verticillatum.