Persian ‘Bearss’ limes, along with key limes, are the most popular commercial limes in the United States. The most obvious physical difference between the two is size. The Persian lime tree’s fruit is significantly larger than the Key lime’s. The tree leaves are also bigger on the Persian lime tree.
Key limes are oftentimes labeled quite plainly ‘lime’ in the grocery store. Shopping for a third type of lime in Minnesota can prove difficult.