Description: This is a tiny submerged or lakeside aquatic plant, local in occurrence although where found it can be abundant in quantity. Its main area in Northern Ireland is south-east County Down, County Armagh and the Lough Neagh shores.

All names: Elatine hydropiper L.

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

iNaturalist: Elatine hydropiper at iNaturalist World Species Observations database.