Beds of small helophytes of fast-flowing waters

Formations of small helophytes [Glyceria plicata], [Catabrosa aquatica], [Sparganium neglectum], [Nasturtium officinale], [Veronica anagallis-aquatica], [Apium nodiflorum], and [Apium graveolens], occupying the banks of small rivers, brooks, brooklets or springs on alluvial or peaty soils .