It's some kind of weed. That's in the back 40(inches :^P) of my property. I keep all that fairly rugged. The back neighbors let that part of their property grow up. It's basically like a woods edge for ~30'. Suits me aside from the vines. They use the little stuff as a scaffold off-property, then end up in my stuff.
I hit it once or twice a year with the brushcutter. Get rid of the trash, and see if anything interesting popped up. No stupid grass to shorten, so that's wonderful. All kinds of crap grows back there, including a good assortment of trees. There's a little beech I'd like to have, but it's too close to my redwood. Thinking about transplanting it somewhere else, but they grow so slow, I'm not sure it's worth the effort. I'll probably let it grow til it starts interfering, then cut it down. A bit of free firewood, for choosing to do nothing.