Perennials: Blooming Right Now - What Is It?, 3 by Cibarius

Cibarius wrote:
This appears to be a cultivated, perennial flower as it blooms in the same lawn every year and its clump gets bigger and bigger. It is an impressive plant because the flower stalks are 3 to 4 feet tall and, after about five years, there are 20 to 30 stalks in the clump. It blooms for about a month in mid-summer. I have attached some pictures showing the blossom, the leaf, and the branching. Can someone help me identify this beautiful plant or suggest another forum where it might be recognized?