Plant wrongly labelled.

in Plants
I bought this water plant as Persicaria amphibia (amphibious bistort) which I can now see it is not.
It has a buttercup flower,so what is it please!
“Every day is ordinary, until it isn't.” - Bernard Cornwell-Death of Kings
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Looks to me like Lesser Spearwort ... we bought some for our wildlife pond ... it has a lovely perfume if you get up close ... I really like it.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thanks Dove!
It does look nice and think it will suit my pond,just a bit miffed it wasn't what I thought I bought!