Common wheat
Bread wheat is an allohexaploid, instead of the original two sets (diploid). There are six sets of chromosomes, two sets from each of three different species. Free-threshing wheat is closely related to spelt wheat. As with spelt, genes from goatgrass (Aegilops tauschii) give bread wheat greater cold hardiness than most wheats. It is cultivated throughout the world's temperate zones.