Rather local species of wet places, river banks and lakesides; mostly found around Lough Erne, Lough Neagh and the Upper and Lower River Bann, and the Quoile Basin. Scattered in a few other localities as well.
It is a perennial species about 6 - 18 ins (15 - 45 cm) tall with creeping stems, pinnate leaves and with very toothed leaflets. Flowers are rather small and yellow.
All names: Rorippa sylvestris (L.) Besser; Nasturtium sylvestre (L.) R.Br.; Radicula sylvestris (L.) Druce
NBN Atlas mapping: Species account : NBN Atlas UK Species Observations database
iNaturalist: Species account : iNaturalist World Species Observations database