Perennial poppies

These are poppies that grew like a hedge at a place where we used to live. We loved them but it seemed to be impossible to transplant them when we moved elsewhere. Someone just sent these pictures of that patch.

Can anyone please identify them for me?

 

Based on the flowers, looks like Romneya coulteri (matilla poppy). I can't see the rest of the plant in the photo very well. R. coulteri will grow to a tall hedge-like clumps. Common farther south.

 

Yes, running roots hard to move. Would be easiest to just buy a new one in a pot.

 

Thank you both very much. When I look it up on the Internet it certainly appears to be it.