Orange Oil, most commonly referred to as Sweet Orange Essential Oil, is derived from the fruits of the Citrus sinensis botanical. Conversely, Bitter Orange Essential Oil is derived from the fruits of the Citrus aurantium botanical.
The exact origin of Citrus sinensis is unknown, as it does not grow wild anywhere in the world; however, botanists believe that it is a natural hybrid of the Pummelo (C. maxima) and the Mandarin (C. reticulata) botanicals and that it originated between the South-West of China and the Himalayas.