Like all mammals humans are a diploid eukaryotic species.

Based on the reported chromosome counts, Alvordia includes both diploid and polyploid species, but the relationships among these have not yet been studied in detail.

The second group contains diploid species and diverse morphologies.

The third group consists of diploid species and uniform morphologies.

The diploid species was then named P. appalachianum.

Data from molecular studies indicate the three diploid species are themselves paleopolyploids.

The following diploid species have been distinguished:

It is a self-pollinating, diploid species with 14 chromosomes.

It has six sets of chromosomes, two sets from each of three different diploid species that are its distant ancestors.

In Triticum, five genomes, all originally found in diploid species, have been identified: