Corn is known only as a domesticated plant.
There exists no wild form except, apparently, a close relative called teosinte . At the time of Columbus's expeditions to the New World, corn was being grown by Indian tribes from Canada to Chile. Corn probably originated in several places in both Mexico and South America. Corn, even today, is an extremely variable species, from the colour of the grains, to the size and shape of the grains and ears. Corn mutates easily, forming new types.