Formations of Fraxinus excelsior and Alnus glutinosa of sub-Atlantic and subcontinental middle Europe, distributed in western Europe, in northern, Central and Eastern Europe, extending south in Central Europe to the confines of the Fagion sylvaticum, Fagion illyricum and Carpinion illyricum zones, with an abundance of Carex remota, Carex strigosa, Carex pendula, Carex sylvatica.