Citrus aurantifolia, the Key or Mexican lime, is a small, round lime with a pale yellowish-green skin. Key limes are more acidic than Persian limes and have a distinctive aroma. The Key lime tree has dense foliage and many very sharp thorns, making them a less popular fruit crop than the Persian variety. Key limes pickled in salt water were a popular treat for children in the 1800s, as readers of Louisa May Alcott's "Little Women" will recall.

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