I included Ents because they came to mind as one of the five races of the free peoples. I kind of wondered how anyone might identify with them, since they feel so "other" to me, but I had not considered the "green" aspect. Heck, I'm a tree hugger too...
I didn't even think of Dúnedain as separate race. Well, because they're not. All half-Elven, half-Human born people in Middle Earth had to choose between the two races. That does not, of course, mean that the Elvish blood disappeared from their veins, but there's that rather critical element that distinguishes the one from the other: Humans are mortal. Thus Dúnedain are Human.
Legate, I have a mind to create another poll thread some time soon, having to do with the Ainur - after all, the Wizards are originally counted amongst them.