Orig. (Miljan 1933): Bidentetum tripartiti
Syn.: Bidentetum tripartitae Koch 1926 (§ 36, nomen ambiguum), Bidenti tripartitae-Polygonetum lapathifolii Klika 1935, Polygono hydropiperis-Bidentetum (Koch 1926) Lohmeyer in Tüxen 1950 p. p.
Formal definition: (Bidens tripartita cover > 50 % OR Persicaria lapathifolia cover > 50 %) NOT group Bidens frondosa NOT group Calystegia sepium NOT group Chenopodium glaucum NOT group Cirsium arvense NOT group Lolium perenne NOT group Stellaria media NOT Bidens frondosa cover > 25 % NOT Bidens radiata cover > 50 % NOT Chenopodium rubrum cover > 25 % NOT Glyceria maxima cover > 25 % NOT Oenanthe aquatica cover > 50 % NOT Rumex maritimus cover > 25 %