I found this pretty patch of asters along the road, near a farm house. It isn't a Black Hills wildflower; I don't know what it is. Birds are good at freeing garden flowers from their cultivated life. :o) Well, ok, could've been the prairie wind, too. Or maybe Mrs. Farmer planted them there on purpose, but gave up on weeding. If you know what this is or might be, please do tell!
Update: Thanks Marnie! The flower is a tickseed, or coreopsis. There are dozens of varieties and after going through over 30 Goggle pages, I still couldn't find the exact same flower. The closest is the red-eyed tickseed.