Formations of small helophytes, Glyceria fluitans, Glyceria plicata, Glyceria nemoralis, Glyceria declinata, Leersia oryzoides, Catabrosa aquatica, Sparganium neglectum, Sparganium microcarpum, Nasturtium officinale, Nasturtium microphyllum, Veronica beccabunga, Veronica anagallis-aquatica, Apium nodiflorum, Sium erectum and Apium repens, occupying the banks of small rivers, brooks, brooklets or springs on alluvial or peaty soils from the Euro-Siberian region, through the Mediterranean basin, to desert oases. Vegetation is typically from alliance Glycerio-Sparganion.