On Tue, 08 Jan 2013 08:44:32 -0800, TimR wrote:

How sure are you of the identification?

Oh yes. Very very very sure!

I have cut human-sized tunnels through poison oak, where the urushiol
literally drips like a faucet overhead from the wrist-sized hangers.

The leaves-of-three are distinctive, and are not wild raspberries (whose
leaves look similar but are furry & spiny). The white berries are also
distinctive, as are the tendrils all over the place.

Of course, the fact that the rash is starting to show up at my wrists,
ankles and neck from my weekend work is yet another clue - but - yes,
there is absolutely no doubt what it is.

The problem isn't identifying it - the problem is getting rid of it
without actually getting it!