Malus pumila
The word "apple" has been used as a a generic term for all fruit other than berries but including nuts. In Old English fingeræppla "dates" are litterally "finger-apples". Potato in French Pomme de terre: "earth-apple". In many of the germanic languages the word for "orange" is refering to the fruit as a "Chinese apples" in various forms derived from the dutch appelsien.