It is difficult to identify the fruits that can be called lime .
Plants with fruit called `` limes '' have diverse genetic origins ; limes do not form a monophyletic group. 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 homonyms in other European languages ) is increased by the botanical complexity of the citrus genus itself , to which the majority of limes belong .
Lime -LRB-fruit-RRB-