The orangeââ¬âspecifically, the sweet orangeââ¬âis 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, 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 4ââ¬â10 cm long. The orange fruit is a hesperidium, a type of berry. Oranges originated in southeast Asia, in either India, Vietnam or southern China. The fruit of Citrus sinensis is called sweet orange to distinguish it from Citrus aurantium, the bitter orange. In a number of languages, it is known as a Chinese apple (e. g. Dutch Sinaasappel, China's apple).
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