Marsh Pennywort (Hydrocotyle vulgaris)
This is a  Native species, not the invasive floating pennywort ( Hydrocotyle ranunculoides )
 low-growing, creeping aquatic plant native to the UK. Found along the edges of ponds, wetlands, and damp grasslands, it is easily recognized by its round, shiny leaves that resemble small coins, giving rise to its common name. Marsh Pennywort spreads through rooting stems, forming dense mats that help stabilize wet soils and provide valuable habitat for pondlife. It thrives in shallow water and moist conditions, making it a popular choice for naturalistic pond margins. This native plant also supports biodiversity by offering shelter for aquatic insects and contributing to healthy wetland ecosystems