National Commission for Knowledge and Use of Biodiversity
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Centers of origin and diversification
Centers of cultivated plants
Mexico as a world center of domestication and origin of cultivated plants
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The species we know today have their origins at different times in the history of the Earth. The origin of most of this diversity goes back to geological times and to events and causes of various kinds, such as continental drift, the dispersion and isolation of flora and fauna, and the genetics of species and their adaptation to different environments. These phenomena gave rise to the particular flora and fauna of the continents today.

Areas where the origin or the differentiation of a particular species or population took place are generally called "Centers of origin".

These species or populations dispersed and became distinguishable from others by different phenomena such as migration, geographical or reproductive isolation, and mutations, successively giving rise to other species and forms.
Centros de origen  
A species, or related group of species, can diversify further in regions other than those of its origin, in which it arrives by the phenomena or processes described. Thus, the present
"centers of diversification" may not be the exact center of origin of a species or a particular biological group. One classic example is the pine with its center of origin in Northwestern China, and its center of diversification in the territory composed of Mexico, Guatemala and Honduras. Of a total of 111 species in the world, 49 species of pines (44%) live in Mexico.