I'm adding this to my plant list because I battle it often and don't want to forget the name. If you live in Austin, you probably know this vine, the one that seems to grow unasked in the shade and tangling up your trees; one day you decide to pull it out and in response it attacks you with a sharp cut from one of its very rose-like sharp thorns. These thorns make it hard to pull this vine out and even if you do, it will still respond by sending up more green vines from some big tuberous root...…