Common Crepe Myrtle

I wasn't actually going to try to identify this one at first. I see it everyday and yet, until a few days ago, I never saw it growing wild. It was always in use as a decorative plant, which its great for as it's very aesthetically pleasing, and I figured it wasn't native.
I was right, it isn't native. The thing is it's gone native. I'm sure everyone reading this knows (or can easily find) about the disaster of Kudzu, but though Crepe Myrtle comes from around the same area it's acclimated well - it flourishes without being a nuisance.

Its long lasting flowers and smooth bark are what make it so easy to identify.
Depending on the variety it's either a small tree or large shrub; full grown it only gets between 15 and 30 feet tall. The trunks (as they're multiple trunked) are thin and smooth, and they look patchy due to the fact that they are constantly shedding bark. They quite honestly feel like someone spent hours sanding the bark smooth.
The flowers are pink, crinkly looking (think "crepe"), and grow in clusters. The flowers bloom throughout the whole Summer and Autumn. The leaves are smooth edged, shiny, about 2-4 inches, and grow oppositely on the stem.

There are lots of little things you can do to properly identify this tree, but I think the best way is to just look at the general idea of smooth mottled light/dark brown bark and pink flowers. It's a very unique plant, you probably won't get it wrong.