The Thornless Mexican lime, also known as the Thornless Key lime or Citrus aurantifolia 'Pettigrew,' is a variety of lime tree known for its absence of thorns and its flavorful fruit. It is a cultivar derived from the traditional Mexican lime tree (Citrus aurantifolia).
 
The Thornless Mexican lime tree shares many characteristics with other lime trees. It typically grows to a height of about 6 to 13 feet with dense, glossy green leaves and a compact, bushy habit. The fruit of the Thornless Mexican lime is small and round, similar to other lime varieties.
 
When sliced open, the fruit reveals juicy, pale green flesh with a tangy and acidic flavor, characteristic of limes. The absence of thorns makes harvesting the fruit and handling the tree easier and safer compared to lime trees with thorns.
 
Thornless Mexican limes are highly versatile and commonly used in culinary applications. They are prized for their strong, acidic flavor, which adds a distinct zesty and refreshing taste to a wide range of dishes, beverages, and desserts. The juice of Thornless Mexican limes is frequently used in marinades, dressings, cocktails, and the popular Key lime pie.
 
The Thornless Mexican lime tree is valued for its productivity and the quality of its fruit. It is a preferred choice for home gardens and commercial plantations, providing a bountiful harvest of thornless limes. This variety is particularly desirable for those who prefer to avoid the potential prickly encounters associated with thorny lime trees.
 
Thornless Mexican lime trees typically thrive in warm climates, requiring well-drained soil and ample sunlight. Their attractive foliage, lack of thorns, and the tart fruit they produce make Thornless Mexican lime trees a sought-after option for citrus enthusiasts.