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Psssst. I moved your photo and the other photo on this entry to Ficus elastica: http://plantsdatabase.com/go/718/, which is the "real" rubber tree.
The hardy rubber plant (Eucommia ulmoides) looks like this: http://www.floraguide.es/arboles/Eucommiaulmoides.htm and is described as having eliptic, toothed leaves in most descriptions (which is borne out by this photo.)