Culms (0.5)1-3 m tall, (0.5)1-2(3) cm thick, unbranched when growing in
corn fields to branched and with staminate inflorescences terminating the many
branches when growing in the open. Blades 30-85 cm long, 3-8 cm wide. Pistillate
inflorescences 5-8(10) cm long, 0.6-0.8 cm thick, distichous, with 2 rows
of spikelets embedded in the rachis; rachises disarticulating at maturity;
fruitcases (6)9-12(15), 6-10 mm long, 4-6 mm wide, triangular in side view,
with pointed apices. Caryopses concealed in the fruitcases. Staminate
panicles with 1-35+ ascending to divergent, somewhat stiff, disarticulating
branches; central axes of staminate panicles as slender as the lateral
branches. Staminate spikelets (6.6)7.5-10.5 mm. 2n = 20.
Zea mays subsp. mexicana is
a weedy taxon, native to upland Mexico. It is most abundant in the Meseta
Central of the Mexican neo-volcanic plateau, at elevations of 1700-2500
m. It grows almost entirely in and around cornfields, and readily hybridizes
with subsp.
mays. The long-day tolerant 'Northern Teosinte' is the result
of a series of backcrosses between such hybrids and the northernmost
population of subsp. mexicana, 'Nobogame Teosinte'.
