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The genus Mammillaria is one of the largest in the cactus family Cactaceae. the distinctive feature of the genus is the specific development of an areole, that is split into two clearly separated parts, one occurring at the tubercules apex, the other at its base.
Keywordskcactus, Mammillaria, Mamillaria, areole
Asa Gray, Introduction to Structural and Systematic Botany (New York: Ivison, Blakeman, Taylor & Co., 1874421
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