The sunflower family includes so many flowers, from giant heads to very tiny. From short to very, very tall. This particular example is a perennial with showy blooms just a few inches across. Deer find them tasty, so they grow in flower jails (cages) on my property. Some insect also finds the blossoms delicious, as the petals are very uneven and often disappear before the bloom is finished.
I purchased starters for this plant from a mail-order catalog, a rarity for me. Years later in my flower gardening path, I found the catalog and can see how the company makes money on this and many others they offer for sale. They multiply easily. I have shared this plant with as many people as I can get to take it. Though it is pretty, it can definitely take over an area.