Mammillaria boolii G.E. Linds. Mammillaria boolii G.E. Linds. in Cact. Succ. J. (Los Angeles) 25: 48. 1953 sec. Hunt 2016=Bartschella boolii (G.E. Linds.) Doweld in Sukkulenty 3: 37. 2000 syn. sec. Guzmán & al. 2003