Old-fashioned Avens, or Geum as it’s often called now, is a lovely spring and early summer perennial that’s airy and well-behaved. For consistency I’ll call it Geum.
This flower is uncommon in the States but better known in Europe. It favors cooler summer conditions than is typical in much of the US. Fortunately in recent years Geums are becoming more available on this side of the pond.