Re: Is this poison ivy?

Because your photos show spines
on the stems~~

* Blackberry vines bear a passing resemblance to poison ivy, with whose climate they overlap. The chief difference with blackberry vines is that they have spines on them, whereas poison ivy is smooth. Also, the three-leaf pattern of the leaves changes as the plant grows: the two bottom leaves both split into two leaves, for a total of five in a cluster.

* The thick vines of grape, with no rootlets visible, differ from the vines of poison ivy, which have so many rootlets that the stem going up a tree looks furry.

source plus more info~~
http://en.wikivisual.com/index.php/Poison_ivy


best wishes,
Zoe

-_-