Persian limes are also known as Tahiti limes. This variety has unknown origins but is suspected to be a hybrid of the Mexican lime and citron, a huge, yellow-green, lumpy lemon. Botanists believe this variety was introduced to the Mediterranean area via Persia (now known as Iran). It was carried to Brazil by Portuguese traders and eventually made it to North America in the latter half of the 1800s.
The Persian lime tree has no thorns and produces thicker-skinned fruit larger than the Key lime which keeps longer. These good traits make it a preferable commercial crop. The fruit is oval-shaped, about the same size as a lemon, with a vivid green peel which turns yellow when ripe.
Limes have a tart, acidic taste with just a slight hint of sweetness.