Description: This is the largest of the docks (dockens). It is found in swamps, fens or lake margins in a few areas.

Lecale and the Erne basin are two areas where the species is very frequent.

All names: Rumex hydrolapathum Hudson

Distribution Map from NBN: Rumex hydrolapathum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Rumex hydrolapathum at iNaturalist World Species Observations database.