Sounds like a waste of round up. This has a large perennial root very similar to a carrot. Either spray herbicide on the foliage or dig up the root after a good rain. It is a native plant and the birds enjoy the berries. If you have a wild area where they can grow, I know they would appreciate it. They can be quite beautiful in the fall with bright red stems and graceful branches. Best control is to learn to recognize seedlings when they are young and pull them out then. Controlling one or two in your yard will not stop the birds from bringing more whether they are in your yard or not.

Once they have taken over the entire dining table, you can set up card table(s). Meals on the couch or recliner are so much more comfortable, anyway...

I find the occasional wild pear sapling in the woods behind my property. I'm not sure if they're 'callery' pears though, since I have a big Asian 'sand' pear tree in my backyard... the deer love the fruit and I'm sure they poop the seeds in the woods. That tree was planted in the mid 1970's so I have no idea what rootstock it's even growing on. Mimosa is everywhere down here, there were two big ones in the backyard of a rental property I recently bought. The first thing I did was to cut them down... they look soft wooded, but I must say I was surprised at how tough that wood is to cut. The biggest invaders in my area are Chinese Privet, Chinese Tallow, and Camphor tree. In drier areas with sandy soil it's not so much a problem, but areas with ample moisture are usually totally infested with it.

Lol, why would they need to evolve, when they are already dominating their newfound ecosystems as-is? And "find a niche and become part of the ecology?" By definition, they've already found farrrrrr more than just a niche and are overwhelming the ecology, much less simply just become a part of it!