Flint corn (Zea mays var. indurata; also known as Indian corn or sometimes calico corn) is a variant of maize, the same species as common corn. With less soft starch than dent corn (Zea mays indentata), flint corn does not have the dents in each kernel from which dent corn gets its name. To protect the soft endosperm, each kernel has a hard outer layer which is likened to being hard as flint, whence the name. It is one of six major types of corn, the others being dent corn, pod corn, popcorn, flour corn, and sweet corn.