Here is another shot of the vine invading my Boston Ivy. On the other side of the chimney, there are also similar leaves but with that distinctive asymmetric lobe that I've seen in the Poison Ivy pictures on this fine web site. These leaves have been subjected to the intense Texas summer heat and I wonder if that is what is making them a bit difficult to categorize. Again what I am very curious about is whether it is possible for Poison Ivy to somehow take over Boston Ivy. The Boston Ivy is about 16 years old and has a thick mat of vines at the base. Thanks, tom