These plants are located alongside a fence in my backyard. What are they?
My biggest concern is that they might be poison ivy. However, the plant in the first picture closely resembles a vine that is growing in our front yard and has several single-leaf offshoots. That suggests it is not poison ivy, as I've read that poison ivy always has its leaves in groups of 3.
The first picture looks similar to the second, but I can't tell what it is -- perhaps a juvenile plant of the same species as #2, or perhaps poison ivy.
Does anyone have an idea of what it is? I get a severe reaction if I touch poison ivy, so I'd prefer to err on the side of caution. But the previous owner of this house was a botanist, so we have lots of unusual plants.