Potted Fan leaved water crowfoot ( ranunculus circinatus)
Ranunculus circinatus is a native perennial herb of clear, base-rich, standing or very slowly flowing water, most frequently in lakes, flooded gravel-pits, sluggish streams and rivers, canals and ditches. It usually grows at depths of 1-3 m ,it has small white buttercup like flowers from around  may to August.