Interesting, but on the wobbly side of science.<p>Trees are usually defined to be something very different from cycads and palms. Today if these were growing, they wouldn't be called trees, and their cluster not called forests.<p>And second, similarly to how 'there's no such thing as a fish', it's been postulated that there's no such thing as a tree. Many different life-forms that we call trees, have no known common ancestor.<p>Make of that what you will.