The orange (specifically, the sweet orange) is the fruit of the citrus species Citrus Ãâ sinensis in the family Rutaceae. The fruit of the Citrus Ãâ sinensis is considered a sweet orange, whereas the fruit of the Citrus Ãâ aurantium is considered a bitter orange. The sweet orange reproduces asexually (apomixis through nucellar embryony); varieties of sweet orange arise through mutations