CITRUS

a genus of plants which produce a great number of useful fruits. Citrus Aurantium is the family name for the trees which give us sweet oranges; Citrus Bigaradia is the bitter or Seville orange; Citrus Limonum, the lemon; Citrus Limetta, the lime; Citrus Medica, the citron; Citrus Paradisi, the grape fruit; and Citrus Japonica, the kumquat.