Tallgrass Prairie Wildflower book for help with identification.
This lilac beauty is one I knew - Wild Bergamot, Monarda fistulosa. Wild Bergamot bloomed in profusion along the trail I often walked when we lived in West Des Moines. It's a member of the mint family. Good for making tea.
Sweet Black-eyed susans are also blooming this week. In a photo, you can't tell them from Black-eyed susans. In person, the Sweet variety is much taller - 6 ft. - and the blooms are much smaller - less than 2 in. across.
With all these new blooms, the prairie is well on its way to showing all its color, but there's much more to look forward to. I've identified only 9 of the 37 species I planted last year.