sounds alot like what we call goat heads out here in AZ. if they have leaves that look like a fern, it's the same thing. I have found, though time consuming as all get out, if you pull them up by the roots (easy to find once you get used to it, just look where all the vines come together) you can just drop them, and they will die. also, i have burned them with a large propane burner hooked to a grill propane tank. no recovery from that! I tried slime, but it won't re seal until you pull it out, so kind of pointless. this works too, but don't get it on anything you don't want dead. just took one healthy application, right at the root and in a week it's dead.