The Thornless (Mexican) Key Lime is one of the most popular North American lime trees. This lime is known by many names such as Key lime, Bartender’s lime, and West Indian lime. The trees are moderately-sized and bushy and the leaves are distinctively aromatic when crushed. Mexican lime trees are sensitive to cold performing best in areas with long summers and frost free winters. The blossoms are pure white and fragrant. The fruits are small with a thin, smooth, greenish-yellow rind at maturity that is especially fragrant. The flesh is greenish-yellow, seedy, and highly acidic, with a fine texture. Once Mexican limes reach full maturity, usually in autumn to early winter, they drop from the tree.