It doesn't happen often, but every now and again TPP runs into a plant in a garden he doesn't know. This particular plant was growing in a semi-formal terrace garden at the George Eastman House in Rochester, NY (one of 1001 gardens you should see before you die). It looks to be a perennial herb with finely divided leaves a bit like yarrow. The flowering scapes were two feet tall, but boy this doesn't ring any bells even to a family level. So here's your chance to impress TPP with your plant prowess.