By Tim Johnson | McClatchy Newspapers

GUELATAO, Mexico — Yank the husks off ears of corn grown in the mountains of southern Mexico, and you may find kernels that are red, yellow, white, blue, black or even variegated.

It’s only one measure of the diversity of the 60 or so native varieties of corn in Mexico. Another is the unusual adaptation of some varieties to drought, high heat, altitude or strong winds.

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