Euhydrophyte communities of Palaearctic streams rich in nutrients, characterized in particular by Ranunculus fluitans, Ranunculus circinatus, Zannichellia palustris f. fluviatilis, Potamogeton nodosus, Potamogeton lucens, Potamogeton pectinatus, Potamogeton crispus, Sparganium emersum, Sagittaria sagittifolia, Callitriche obtusangula, Nuphar lutea and the moss Fontinalis antipyretica.