Anyone any good at identifying plants?

I'm cutting away a bunch of undergrowth on the hillside behind our house (making room for a garden, getting more sun on the pool, getting the back deck to feel less cramped...), and the easiest way to deal with what I cut down seems to be a burn pile. Thing is, some of these plants I can't identify, and I'm wary of burning them without knowing that, because I'm well aware that some plants can produce toxic smoke.

There are some hanging vines and oak branches that I know are safe, but these two are the ones I'm concerned about:

And I'm pretty sure these are safe, but just on the grounds that they're by far the most common thing I'm cutting down, I kinda want to know what, exactly, they are:

Any help is appreciated.

Comments

[Lord Despair]

I'm pretty sure that the second pic is poison ivy but could be wrong

[Andy Soshal]

Yep; those are plants.

[PresentPerfect]

It's hard to tell from a distance, but the top looks like ailanthus. They're the weeds of the tree kingdom. If they smell like peanut butter when cut, that's them. :B Get rid of 'em.

[Rinnaul]

4011450
Nah, poison ivy is a small, low-lying vine. These are inch-thick stalks about 6 feet long. They're hollow like bamboo or reeds, but fleshy like broccoli stalks. Some kind of weed, I'm sure, but no idea beyond that.

4011605
I got the same answer on another site I asked on, and I'll try mashing some to test the smell once I'm over my current allergic episode. Might get a more close-up picture, too, or ask a friend of mine who's a biology major and works with plants if I see him sometime soon.

I have a cluster of the things at the corner of the pool, which I was going to leave in for shade, but if they're that aggressive and invasive, I might wipe out the whole bunch so they don't regrow into the flower beds we want to put in.

[BeneathAMask]

These plants seem to be part of the green variety... with leaves too!