Intertaxon relationships
species
Nematus septentrionalis (Linnaeus, 1758)
Alnus glutinosa (L.) Gaertn. - Black Alder 
Alnus incana (L.) Moench - Grey Alder
Betula pendula Roth - Silver Birch
Carpinus betulus L. - European Hornbeam
Corylus avellana L. - Hazel