Sean
We get these mongrels too, also itchy as hell.
http://cal.vet.upenn.edu/poison/plants/ppphilo.htm
And the ones you said, itchy also, except for a period a lot longer than a few moments. I get welts and crazy itching for a few days.
http://www.ces.ncsu.edu/depts/hort/c...on/Epiprau.htm
And then these ficus creepers, make me itch like crazy too!
http://images.google.com/imgres?imgu...GL:en%26sa%3DG