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"These two species are interfertile, meaning that they can interbreed and produce viable offspring," the Center stated on its website.

Multiple interfertile tetraploid species have arisen from the ancestral tetraploid following hybridization, including C. berlandieri and C. hircinum, although the evolutionary relationships among quinoa and its diploid and tetraploid relatives remain unclear25.

The reason may be, in part, a lack of mating compatible isolates — as interfertile isolates have been identified only for Chlamydomonas reinhardtii laboratory strains — or the strong push in most biofuel research towards molecular and transgenic technologies rather than breeding.

It shows that even after several hundred thousand years of separation, the two species were interfertile.