While peaches and nectarines are very similar and of the same species, a gene variant between the two means that peaches are covered in fuzz, while nectarines are not.
Original photo by and © 2007 NaJina McEnany. Photo prepared by User:Ram-Man. Used by permission. GFDL 1.2 or CC BY-SA 2.5, via Wikimedia Commons
While peaches and nectarines are very similar and of the same species, a gene variant between the two means that peaches are covered in fuzz, while nectarines are not.