Is this a dieffenbachia plant? It looks a bit different from the other pictures on your site? I bought it at Longwood Gardens in Pennsylvania (former home of one of the DuPont families)
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Yes, this is a Dieffenbachia. There is great variation in foliage coloration as this google image search demonstrates. Yours may be Dieffenbachia maculata v. 'Starbright.'
Replied January 3, 2016, 10:35 PM EST