What is it called?

Bees love this plant in my garden. I have never seen it anywhere else, except in a friend’s garden. She gave me a piece and it has done well. She didn’t know its name, and she has since moved away from that garden, twice. So I wonder if any blippers are acquainted with this flower.
The friend in question is Pauline and it is her birthday today. I hope she has had a good day.