Abstract
Abstract Essentially confined to the New World, the family Cactaceae comprises about 100 genera and 1500 species (Barthlott and Hunt 1993). It is one of the most typical floristic elements of Mexico, which harbors 50 genera and about 550 species—the richest assemblage of cacti in the world. Most Mexican Cactaceae species occur in the arid and semiarid ecosystems and regions of the country, most notably the Chihuahuan Desert Region, the Sonoran Desert, and the Tehuacán Valley. Both nationwide and worldwide, the Chihuahuan Desert Region in particular stands out as having the highest diversity of Cactaceae (Hernández and Godínez 1994; Hernández and Bárcenas 1995).
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