Dendrogram of the associations: TpAg (cluster 1) – Thelypterido palustris-Alnetum glutinosae; CaAg (clusters 2–3) – Carici acutiformis-Alnetum glutinosae; CeAg (cluster 4) – Carici elongatae-Alnetum glutinosae; SpBp (cluster 5) – Salici pentandrae-Betuletum pubescentis; EvBp (cluster 6) – Eriophoro vaginati-Betuletum pubescentis; TpBp (cluster 7) – Thelypterido palustris-Betuletum pubescentis.