Epithelantha greggii (Engelm.) Orcutt, Cactography 5. 1926 sec. Aquino & al. 2019
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- =Mammillaria greggii (Engelm.) Saff., Annual Rep. U.S. Natl. Mus. 531. 1908 syn. sec. ???
- =Epithelantha micromeris var. greggii (Engelm.) Borg, Cacti (Borg): 529. 1937 syn. sec. ???
- =Epithelantha densispina Bravo in Anales Inst. Biol. Univ. Nac. México 22: 19. 1951 syn. sec. ???
- =Epithelantha rufispina Bravo in Anales Inst. Biol. Univ. Nac. México 22: 22. 1951 syn. sec. ???
- =Epithelantha micromeris var. densispina (Bravo) Backeb. in Cactus (Paris) 39: 31. 1954 syn. sec. ???
- =Epithelantha micromeris var. rufispina (Bravo) Backeb. in Cactus (Paris) 39: 31. 1954 syn. sec. ???
- =Epithelantha micromeris subsp. greggii (Engelm.) N.P. Taylor in Cactaceae Consensus Init. 5: 12. 1998 syn. sec. ???
- =Epithelantha petri Halda & Horácek in Acta Mus. Richnov., Sect. Nat., 7: 72. 2000 syn. sec. ???