Looks like Lantana.

It looks like an Indian Rosewood tree to me. They are very invasive via root shoots, so if one was within 30 feet of it, it could be a root shoot of that.

I probably need to get a better picture, but it doesn't look like either of these to me.

Boy Tom, that's a tough one. I even took your pic and enlarged and sharpened before searching the web and can't find a match. The silvery, fuzzy stems and very loose form is very similar to buddleia "Honeycomb" but obviously isn't it..flowers aren't right. I'm looking forward to finding out what this is :)