Orange fruit

An orange—particularly, the sweet orange—is the citrus tree 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, probably among pomelo (Citrus maxima) and tangerine (Citrus reticulata). It is a small flowering tree growing to about 10 m tall with evergreen leaves, which are set alternately, of ovate shape with crenulate margins and 4–10 cm long. The orange fruit is a hesperidium, a kind of berry.