Orig. (Nowiński 1930): Equisetetum heleocharis (Equisetum heleocharis = E. fluviatile)
Syn.: Equisetetum limosae Steffen 1931
Formal definition: Equisetum fluviatile cover > 25 % NOT group Caltha palustris NOT group Cirsium oleraceum NOT Carex acuta cover > 50 % NOT Carex diandra cover > 25 % NOT Carex lasiocarpa cover > 25 % NOT Cicuta virosa cover > 25 % NOT Cirsium rivulare cover > 25 % NOT Filipendula ulmaria cover > 25 % NOT Glyceria maxima cover > 25 % NOT Lysimachia vulgaris cover > 25 % NOT Phragmites australis cover > 25 % NOT Schoenoplectus lacustris cover > 25 % NOT Sparganium erectum cover > 25 % NOT Typha angustifolia cover > 25 % NOT Typha latifolia cover > 25 %