Don't know about the red leaves but this is a better photo of the white/pink flowers from your other post. It includes leaves

I'm even now more persuaded it's a Callirhoe.

Ah interesting, a white Callirhoe? Most of the ones around here range from pink to purple, though... But, I wonder if there any white ones here?

They look very pale pink to me.

callirhoe involucrata var lineariloba.