Orig. (Miyawaki & J. Tüxen 1960): Lemnetum gibbae (W. Koch 1954) ass. nova

Syn.: Wolffio-Lemnetum gibbae Bennema 1943 ms. p. p. (§ 1), Lemno-Spirodeletum polyrhizae Koch 1954 lemnetosum gibbae Koch 1954 (§ 2b, nomen nudum)

Formal definition: Lemna gibba cover > 50 % NOT Acorus calamus cover > 25 % NOT Berula erecta cover > 25 % NOT Butomus umbellatus cover > 25 % NOT Carex riparia cover > 25 % NOT Ceratophyllum demersum cover > 25 % NOT Eleocharis palustris agg. cover > 25 % NOT Elodea canadensis cover > 25 % NOT Equisetum fluviatile NOT cover > 25 % NOT Glyceria maxima cover > 25 % NOT Lemna trisulca cover > 50 % NOT Oenanthe.aquatica cover > 25 % NOT Phragmites australis cover > 25 % NOT Potamogeton natans cover > 25 % NOT Potamogeton nodosus cover > 25 % NOT Potamogeton pectinatus cover > 25 % NOT Rumex maritimus cover > 25 % NOT Schoenoplectus lacustris cover > 25 % NOT Sparganium erectum cover > 25 % NOT Typha latifolia cover > 25 % NOT Zannichellia palustris cover > 25 %