The purple flowers of this thistle looked so pretty out there in the field. When I went to pick some -- ouch, ouch, ouch -- every bit of this plant was covered with spines. Since then someone told me it is bull thistle. I found a funny site on line called Eat the Weeds. You can actually eat the stalks after stripping off all the spines. Supposedly, the stalks taste like bitter celery. I am going to take his word for it.