Are Limes Unripe Lemons?

Limes tend to have a higher citric acid and sugar content than lemons. Limes are a good source of vitamin C and are commonly used to enhance the flavor of food and beverages. Limes typically are between 2 and 3 inches in diameter and contain an acidic pulp. The two primary types of limes are Mexican limes and Persian limes. Mexican limes are the ones referred to as Key limes.