Orig. (Lohmeyer 1950a): Polygoneto Brittingeri-Chenopodietum rubri Lohm. 1950 (Polygonum brittingeri = Persicaria lapathifolia subsp. brittingeri)
Syn.: Xanthio riparii-Chenopodietum rubri Lohmeyer et Walther in Lohmeyer 1950 (§ 25)
Formal definition: Persicaria lapathifolia cover > 5 % AND (Xanthium albinum s. l. cover > 5 % OR group Chenopodium glaucum) AND (group Bidens frondosa OR group Ranunculus sceleratus) NOT Atriplex prostrata subsp. latifolia cover > 25 % NOT Chenopodium ficifolium cover > 25 % NOT Chenopodium glaucum cover > 25 % NOT Chenopodium rubrum cover > 25 % NOT Ranunculus sceleratus cover > 50 % NOT Rumex maritimus cover > 25 %