For all enthusiasts, the question of plant labeling arises one day. The name makes it possible to find oneself in the myriad of genera and species that make up the large family of cactaceae. In the following article you will learn all about the genus, species, subspecies, variety or cultivar. 

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I would like to thank the editor of Cactus World who allowed me to reproduce here Al Laius's article from CactusWorld Vol. 40 (4) p255-256.