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Hieracium caespitosum
I should add a link to the database: http://plants.usda.gov/java/nameSearch
This looks like what I've always called a Prairie Dandelion (Krigia). Not sure where I got the common name though. However, the USDA plant database doesn't show any species of Krigia in the area where this spotting was made, so I'm a bit perplexed. Hope you have some time to do some research and be sure to let us know what you find out.