The Key Lime or acid Lime is a citrus hybrid native to tropical Southeast Asia. Its fruit is spherical and usually picked while it is still green, but it becomes yellow when ripe. The trunk rarely grows strait and has many branches, which often originate quite far down the trunk. The leaves are ovate, resembling orange fruit tree leaves.

The Key lime has a thinner rind and is smaller, seedier, more acidic, and more aromatic than the Persian lime. It is valued for its characteristic flavor. The name comes from its association with the Florida Keys, where it is best known as the flavoring ingredient in Key lime pie.

Source: Wikipedia.
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