Amphibious bistort?

Amphibious bistort?

Observation - Amphibious bistort? - UK and Ireland. Description: I can't think what else this could be - given that it's growing in and beside the water but the leaves don't look right. According to the illustration in my book the tips of the leaves should be more rounded

I can't think what else this could be - given that it's growing in and beside the water but the leaves don't look right. According to the illustration in my book the tips of the leaves should be more rounded