Description: Mainly found about Upper and Lower Lough Erne, Lough Neagh and its tributaries, the Upper and Lower River Bann and the River Lagan, but with some other scattered localities. On riversides, lakesides, in ditches, ponds and marshes.

A native perennial with undivided leaves and small yellow flowers.

All names: Rorippa amphibia (L.) Besser; Radicula amphibia (L.) Druce; Nasturtium amphibium (L.) R.Br.; Armoracia amphibia (L.) G.F.W.Mey.

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

iNaturalist: Rorippa amphibia at iNaturalist World Species Observations database.