A term that has never been satisfactorily defined. Its most usual definition is a group of individuals that are sexually compatible with each other, but not with other members of the same genus or family. A crop species is usually made up of different commercial varieties, agro-ecotypes, or pathodemes which are all sexually compatible with each other, but not with other crop species in the same genus of family. However, both interspecific and inter-generic hybridisation are often possible. For example, wheat and rye are different genera, but they have been hybridised to produce and inter-specific hybrid called Triticale.
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