A lime (from Arabic and French lim)[1] is a citrus fruit, which is typically round, lime green, 3–6 centimetres (1.2–2.4 in) in diameter, and containing acidic juice vesicles.[2] There are several species of citrus trees whose fruits are called limes, including the Key lime (Citrus aurantifolia), Persian lime, kaffir lime, and desert lime.[2] Limes are an excellent source of vitamin C, and are often used to accent the flavours of foods and beverages. They are grown year-round in tropical climates and are usually smaller and less sour than lemons, although varieties may differ in sugar and acidic content.[3] Plants with fruit called "limes" have diverse genetic origins; limes do not form a monophyletic group.