Gardening...what will pop up?

When we moved here in September things were just starting to die. We didn't really know what we had in the backyard except a lot of hostas. We have a lot of different ones. Below are a few I find particularly pretty.

Then we have this tree. It sits in the back corner of our lot. If I remember correctly this past fall the leaves were dark red. It looks like it's tipped over, but really it's not. It grows like that. (Please excuse the lovely patch of burning nettles, I just haven't gotten up the nerve to tackle them yet.) Does anyone know what this is?