Pistachios come in numerous varieties. Most have been developed by farmers, including small-scale variations in specific regions like Iran. Every so often, one of these small, regional variations will get picked up on a larger scale and is produced by other farmers. Eventually, some can become commercial varieties. When it comes to Iranian pistachios, there are two primary commercial varieties, categorized by shape: long or round. If the ratio of the length of the pistachio to its diameter at the thickest point is greater than 1.5, then it is called long – otherwise, it’s called round. The original, wild pistachios were of the long type. Eventually, around 70 years ago, the round variety was developed by a farmer from Rafsanjan whose name was Mr. Ohadi. The many commercial varieties tend to come in and out of fashion, with some no longer in production.