Orig. (Koch 1954): Lemneto-Spirodeletum polyrrhizae (Lemna minor, L. paucicostata)

Syn.: Lemno-Spirodeletum Slavnić 1956 (fantom), Spirodeletum polyrhizae Kehlhofer ex Tüxen et Schwabe in Tüxen 1974

Formal definition: (Spirodela polyrhiza cover > 50 % OR (Lemna minor cover > 50 % AND Spirodela polyrhiza cover > 5 %) OR (Lemna minor cover > 25 % AND Spirodela polyrhiza cover > 25 %)) NOT Acorus calamus cover > 25 % NOT Alisma plantago-aquatica cover > 25 % NOT Bidens cernua cover > 25 % NOT Bolboschoenus maritimus s. l. cover > 25 % NOT Carex pseudocyperus cover > 25 % NOT Ceratophyllum demersum cover > 25 % NOT Cicuta virosa cover > 25 % NOT Elodea canadensis cover > 25 % NOT Equisetum fluviatile cover > 25 % NOT Glyceria fluitans cover > 25 % NOT Glyceria maxima cover > 25 % NOT Hydrocharis morsus-ranae cover > 25 % NOT Juncus effusus cover > 25 % NOT Leersia oryzoides cover > 25 % NOT Lemna trisulca cover > 50 % NOT Myriophyllum verticillatum cover > 25 % NOT Nuphar lutea cover > 25 % NOT Oenanthe aquatica cover > 25 % NOT Persicaria amphibia cover > 25 % NOT Potamogeton pusillus agg. cover > 25 % NOT Potamogeton natans cover > 25 % NOT Potamogeton pectinatus cover > 25 % NOT Potamogeton trichoides cover > 25 % NOT Rumex maritimus cover > 25 % NOT Sagittaria sagittifolia cover > 25 % NOT Salvinia natans cover > 5 % NOT Schoenoplectus lacustris cover > 25 % NOT Sparganium emersum cover > 25 % NOT Sparganium erectum cover > 25 % NOT Stratiotes aloides cover > 5 % NOT Typha angustifolia cover > 25 % NOT Typha latifolia cover > 25 % NOT Utricularia australis cover > 25 % NOT Wolffia arrhiza cover > 25 %