Well, I was vindicated today. For years I have maintained that there is a 5-leaf version of poison ivy and no-one believed me.
Today I pulled up a poison ivy vine, and found both the standard
3-leaflet sets *and* the 5-leaflet sets one it!
Silly me, though, I didn't think to take a photo of it until just now
- when it's already met it's fate. Oh well, I'll just have to wait - I'm sure I'll find the (#&%&^% stuff again.
Just in case you're curious, the 5-leaflet set looks like the
3-leaflet set, except there are 2 more small leaves on the outside forming a neat circle of leaves. The notches are the same and everything. This version looks verrry like another vine that is called wandering jenny, as I recall. Makes me wonder if they are related.