Anemone mix.
Looks like three diffrent flowers here, but these are almost siblings,
these yellow and white versions of anemone. The red one is simply a
mature version of the white, which from time to time tend to get red(ish)
in the mature stage of its bloom, especially on the back side of the petals.
The yellow one is more scarce, but on some locations they grow mingled together.
As here, in the bio-sanctuary Rotlia in Hedmark county, SE Norway.