That's how 28 -
chromosome emmer wheat, for instance, mated with another 14 - chromosome wild grass, goat grass, and yielded the ancestor of all modern wheat, the first Triticum aestivum species.
Not exact matches
Emmer (a tetraploid grass) has four
chromosomes, compared to Einkorn's two, and Spelt (a hexaploid
wheat variant) has six
chromosomes.
If you believe in eating less complex grains, einkorn, barley, and rye are diploid, with two sets of
chromosomes;
emmer and durum including kamut are a little more complex; they're tetraploids with four sets of
chromosomes; spelt and bread
wheat varieties are hexaploid with six sets of
chromosomes.