The apple is the pomaceous fruit of the apple tree, Malus domestica of the rose family (Rosaceae). It is one of the most widely cultivated tree fruits, and the most widely known of the many members of genus Malus that are used by humans. Apples grow on deciduous trees which are large if grown from seed, but small if grafted onto roots (rootstock). The tree originated in Central Asia, where its wild ancestor, Malus sieversii, is still found today. Apples have been grown for thousands of years in Asia and Europe, and were brought to North America by European colonists. Apples have been present in the mythology and religions of many cultures, including Norse, Greek and Christian traditions
The proverb "An apple a day keeps the doctor away", addressing the health effects of the fruit, dates from 19th century Wales. According to the United States Department of Agriculture, a typical apple serving weighs 242 grams and contains 126 calories with significant dietary fiber and modest vitamin C content, with otherwise a generally low content of essential nutrients (table, right). Apple peels are a source of various photochemical with unknown nutritional value .