It was growing in colonies, head and shoulders above the other prairie plants there.
It had the most intricate little flowers, and I could not help photographing it.
This is a native species, so we can rejoice in its beauty and feel no guilt!
It took some time, but thanks to our Tallgrass Prairie Wildflowers field guide, I was at last able to identify this plant. This book has been a trusted companion of ours for more than fifteen years, and I would recommend it to anyone. It was written by Doug Ladd, and the photos were taken mostly by Frank Oberle. They are rock stars in their fields. Excellent book!