Echinacea purpurea. It comes in many other flavors, too (white, yellow, pink, orange, even double-petalled varieties).
Rudbeckia hirta (Black-eyed Susan, Gloriosa Daisy, Yellow Ox-eye Daisy) comes in a lot of different flavors, too. Some cultivars to searh for are: 'Prairie Sun', 'Chim Chiminee', 'Cherokee Sunset', to name only a couple.
What colors are you actually looking for. And, by 'similar to', are you wanting "daisy" shaped flowers? Flowers stalks that terminate in a single blossom? Do you mean, specifically, wildflowers? Is there a reason that Rudbeckia or Echinacea won't suit your needs?
Actually, I meant I like the way Susans stay in their clusters. I have a couple runners, but for the most part they stay together. I don't want something that scatters all over.
Well, my friend has some reclaimed prairie with lots of Echinacea, and it's already spent...just brown seed heads.
A lot of wildflowers fit that bill. Check the different species of Liatris. My Liatris aspera is still blooming, and the L. pycnostachya has just finished.
I'm just a bit south of you (near StL). My coneflowers (Echinacea and Ratbida) are still going strong. Deadheading helps their performance, as well as keeps the spreading down. I leave a few heads for the birds, at the end of the season. =)
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