I dig so much of this out and don't know what to call it. We sometimes call it "devil vine" or "devil weed" but there are (of course) other plants with that common name, and IMO none as devilish as this stuff.
Got a good chunk out today.
It has wicked thorns and very tightly coiled tendrils which it uses to attach to any and everything including other plants:
Deep rooted, the roots branch off from these nodules which are usually at least six inches below soil surface and often deeper:
Those are respectable size nodules but I've seen them two and three times as large (like maybe an inch and a half in diameter.)
I'm sure someone knows this one! It's pretty common in the Southeast.
Thanks in advance.