The orange is a hybrid of ancient cultivated origin, possibly between pomelo (Citrus maxima) and mandarin (Citrus
reticulata). It is an evergreen flowering tree generally growing to 9–10 m in height (although very old specimens have
reached 15 m). The leaves are arranged alternately, are ovate in shape with crenulate margins and are 4–10 cm long.
The orange fruit is a hesperidium, a type of berry.