The ancestry of modern maize has long been a puzzle. Unlike other domesticated grasses, there didn’t seem to be any wild species that looked like the modern cereal and from which farmers could have selected better versions. For a long time, botanists weren’t even sure which continent maize was from. That seemed to be settled with the discovery in lowland Mexico of teosinte, a wild and weedy relative of maize, and a lot of work to understand the genetic changes from teosinte to maize. The big problem was that the genetic work also seemed to contradict the story, by finding remnants of different types of teosinte. A new research paper sorts out the story, which is now more complicated, better understood, and offers some hope for future maize breeding.

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