I have found an interesting vine-like pariste (for no better word).It doesn't come out of the ground with a root system, but it wraps around the plant tightly. It likes snapdragons and petunias mainly. It has little color, almost a sickly cream. Pulling it off the plant does more harm than good . Can anyone identify it and tell me how to kill it, without hurting the surrounding plants? thank you for your knowledge.