The limes most commonly available commercially are the smaller, yellower Key lime (Citrus aurantifolia) and the larger, greener Persian lime (Citrus × latifolia). "Key lime" is an American retronym, as the original fruit known in English as a "lime" was Citrus aurantifolia, derived from the Persian name ????, limu (the fruit was introduced to Europe during the Crusades). Other limes include the Mandarin lime (Citrus limonia), Kaffir lime (Citrus hystrix), the various Australian limes, Spanish lime (Melicoccus bijugatus), wild lime (Adelia ricinella), sweet lime (Citrus limetta), Palestine sweet lime (Citrus limettioides), and musk lime (X Citrofortunella mitis). The limequat is a lime-kumquat hybrid.

example Text from: Wikipedia - Lime fruit