Lime

A lime is a citrus fruit, which is typically round, green in color, 3–6 centimetres in diameter, and contains acidic juice vesicles. There are several species of citrus trees whose fruits are called limes, including the Key lime (Citrus aurantiifolia), Persian lime, Makrut lime, finger limes, blood limes, and desert lime. Limes are a rich source of vitamin C, are sour, and are often used to accent the flavours of foods and beverages. They are grown year-round. Plants with fruit called "limes" have diverse genetic origins; limes do not form a monophyletic group. The term lime originated in other languages (from French lime, from Arabic līma, from Persian līmū, "lemon"). The difficulty in identifying exactly which species of fruit are called lime in different parts of the English-speaking world (and the same problem applies to synonyms in other European languages) is increased by the botanical complexity of the Citrus genus itself, to which the majority of limes belong. Species of this genus hybridise readily; only recently have genetic studies started to shed light on the structure of the genus. The majority of cultivated species are in reality hybrids, produced from the citron (Citrus medica), the mandarin orange (Citrus reticulata), the pomelo (Citrus maxima) and in particular with many lime varieties, the micrantha (Citrus hystrix var. micrantha).

Source: Wikipedia