Pond Plants

Can anybody identify this floating plant with lovely white flowers? I discovered masses of it forming matted rafts in the Shoulder of Mutton lake at Wanstead Park. The way it’s spreading suggests this invasive floating plant could be troublesome and not a t all suitable for a small pond, but I’ve put a small amount of it into my pond anyway. If it gets out of hand I reckon I’ll be able to deal with it. Can’t be any worse than the duckweek or azolla anyway!

floating Plant White Flower

The leaves look a bit like buttercup and the flowers stick out of the water on short stems, white with a small yellow centre. It’s not frogbit.

I’ll be able to post a close up picture of the sample of this plant in my own small pond later.