we live in coastal NC, zone 8a. there is a very tough and invasive vine that has killed some of the old shrubs here. (we bought an old, old house with a terribly neglected and overgrown yard.) it has a deep orange flower very like the trumpet vine, extremely nasty thorns and odd-shaped leaves. it puts out underground runners, like the briar in the mountains. anyone know what this is, or better yet, how to get rid of it permanently?