Perhaps a type of Sonchus?

esh ga, looked at some google pictures of Sonchus,the ones that I looked at didn't seem to be a match.I also looked at prickly lettuce,the plant was similar in height and similar in leaves but no prickly stuff anywhere to be found,plus, I think the leaves of the lettuce seemed to be more cut and lighter in color and skinnier with whitish looking vein down thru the middle of the leaf.Hope it flowers before it dies, maybee that will help in its identification..thanks ...Tom

Wild Lettuce, Lactuca canadensis? Related to Prickly Lettuce, but native and without the prickles. Not the most desirable native plant, perhaps, but otherwise harmless.

Here is a link that might be useful: Wild Lettuce on www.illinoiswildflowers.info

dbs illinois 4 ,looked up Lactuca canadensis, and found other Lactuca's , one being Lactuca floridana which is supposed to have blue flowers,that one is more similar to what the picture is, hope when it floweres I can that I will know for sure..For all I know its a completely different plant...Tom in NWPA