In addition to cultivated maize, the genus Corn includes four species - Zea diploperennis, Zea perennis, Zea luxurians, Zea nicaraguensis - and three wild subspecies of Zea mays: ssp. parviglumis, ssp. mexicana and ssp. huehuetenangensis. It is believed that many of these taxa played a role in the selection of cultural maize in ancient Mexico. Corn is believed to be the oldest cereal plant in the world.
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