Zea mays, commonly known as maize or corn, is a grass species indigenous to Mesoamerica. The species has 10 chromosomes, and about 3200 coding genes have been annotated on the genome, while 85% of the entire genome is composed of transposons.

Further reading:

The B73 Maize Genome: Complexity, Diversity, and Dynamics. Science 326, 1112-1115 (2009) [pubmed]