[4] This is one of the three types of corn cultivated by Native Americans, both in New England and across the northern tier, including tribes such as the Pawnee on the Great Plains.They used many generations of selective breeding to transform a wild teosinte grass with small grains into the rich source of food that is modern Zea mays.Like the Linnaeus variant of maize, any kernel may contain the yellow pigment zeaxanthin but at more varying concentrations.[8] Popcorn (Zea mays everta, "corn turned inside out") is considered a variant of this type.In the United States, the flint corn cultivars that have large proportions of kernels with hues outside the yellow range are primarily used ornamentally as part of Thanksgiving decorations.