Description: An aquatic plant with leaves of two sorts: submerged leaves are ribbon-shaped; leaves which emerge above water develop the characteristic arrow-head shape. Flowers are pale pink in a spike.

A rather local plant of some lakes, canals and rivers, mainly the River Lagan, the Upper and Lower Bann, Newry canal, Lough Neagh and the Erne basin.

All names: Sagittaria sagittifolia L.

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

iNaturalist: Sagittaria sagittifolia at iNaturalist World Species Observations database.