These are ouchy flowers as our 5 year old great grand calls them. Tar weed is also a noxious weed in the hay fields around here.
the south field, full of tarweed. The south field was disced, dragged but not plowed. At this point, mid May it was so full of tarweed the hay will be unsalable.
This last shot is of the plowed field, the space around the power pole that was unplowed, solid tarweed.