I thought I knew all the plants that would attack me in southern Illinois…then I headed off trail to find a good spot for a cathole and started to push through a shoulder-high thicket of these guys:
This proved to be a mistake, due to the hitherto-unnoticed-by-me spiky thorns all over their stems. I found another spot, so now I’m just left with small punctures & curiosity.
I’d say you’re correct - and that map at the USDA has to be old, because I’m in MN and we absolutely have it here