In slow moving streams, marshes, ponds and ditches, this plant can be seen on flower from June to September. It's a creeping perennial which spreads by rhizomes and it bears deep pink flowers in dense, erect spikes, each having five protruding stamens. The hairless, floating leaves are linear, truncate at their base and borne on long petioles. Commonly found throughout Ireland, this native plant belongs to the Polygonaceae family.
I first recorded this wildflower near Killoughter, Co Wicklow in 1979 and I photographed it growing on Vartry Reservoir, Co Wicklow in 2010
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre