Fringed Water-lily is an aquatic perennial that roots on the bottom of ponds and slow-moving waterways up to 2m deep. It bears bright yellow, 5-petalled flowers about 3-4cm in diameter, the petals being finely fringed – giving the species its common name. Each flower has 5 stamens and one style and the stigma is 2-lobed. The flowers are long-stemmed, growing in smallish clusters from leaf axils and each of them only lasts for a day. These flowers can be either ‘thrum-eyed’ or ‘pin-eyed’. (See text on Primrose webpage for explanation of those terms). The flowers bloom from June to September. The leaves are 3-11cm across, are round to kidney-shaped, deeply heart-shaped at base and floating in dense masses. This is an introduced species which is now classified as a ‘High Impact Invasive’ and is scattered across Ireland with the greatest number of records occurring in the north-east. While it resembles the Yellow Water-lily, it is not a member of the Water-lily family, instead belonging to the Bogbean or Menyanthaceae family.
I first saw this species in 2014 at Ballycroy in County Mayo where I photographed it. The flowers were at the far side of a large pond so the images are not brilliant – maybe another time I might get a better picture.
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre