An orangespecifically, the sweet orangeis the citrus Citrus ‹sinensis (syn. Citrus aurantium L. var. dulcis L., or Citrus aurantium Risso) and its fruit. The orange is a hybrid of ancient cultivated origin, possibly between pomelo (Citrus maxima) and tangerine (Citrus reticulata). It is a small flowering tree growing to about 10 m tall with evergreen leaves, which are arranged alternately, of ovate shape with crenulate margins and 410 cm long. The orange fruit is a hesperidium, a type of berry. Oranges originated in Southeast Asia. The fruit of Citrus sinensis is called sweet orange. The orange peels are rich in fiber, vitamin C, folate, vitamin B6, calcium and other essential nutrients. The skin of the oranges contains a good amount of polyphenols that protect against several diseases. Peels have anti-cancerous properties, due to the presence of limonene, a naturally occurring chemical.