Abstract
The wheat genus Triticum L. belongs to the subtribe Triticinae of the tribe Triticeae of the family Gramineae. Other genera of the Triticinae are Agropyron (the wheat grasses), Secale (rye), and Haynaldia. Until recently, another genus, Aegilops, was recognized, but after the discovery that at least one of the three genomes (basic sets of seven pairs of chromosomes) of hexaploid or common wheat had come from Aegilops, there was no way to maintain Aegilops as a separate genus and still continue to put all the wheat species in the genus Triticum. Tetraploid wheat, if it is an amphiploid of diploid Triticum and a diploid Aegilops species, could not be designated Triticum; nor could hexaploid wheat, an amphiploid of tetraploid Triticum and another diploid Aegilops, be included in the same genus as only one of its parents.
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