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The term originates from the value of a Roman pound (Latin: libra, about 329g, 10.58 troy ounces) of high purity silver. The libra was the basis of the monetary system of the Roman Empire. When Europe resumed a monetary system, during the Carolingian Empire, the Roman system was adopted.
In North America, mandarins are commonly purchased in 5- or 10-pound boxes, [5] individually wrapped in soft green paper, and given in Christmas stockings. This custom goes back to the 1880s when Japanese immigrants in Canada and the United States began receiving Japanese mandarin oranges from their families back home as gifts for the New Year.
The tangerine is a type of citrus fruit that is orange in color, that is considered either a variety of Citrus reticulata, the mandarin orange, or a closely related species, under the name Citrus tangerina, [1] [2] [3] or yet as a hybrid (Citrus × tangerina) of mandarin orange varieties, with some pomelo contribution.