Hope you're looking in, Ann, as this is another one I don't recognise.
This will be the last one for this year. It's about 15 to 18 inches tall, a perennial and it appears to be forming a good clump at the bottom. The flowers are quite flat and the buds are like discs.
Although I set the seed about two years ago, this is the first time it has flowered, and I haven't the vaguest idea what it is.