Melocactus violaceus subsp. margaritaceus
Melocactus violaceus subsp. margaritaceus in Bradleya 9: 57. 1991 sec. Zappi & Taylor 20201
- =Melocactus pentacentrus, Cact. Gen. Sp. Nov.: 108. 1839 syn. sec. Taylor & Zappi 20042
- =Melocactus ellemeetii in Ned. Kruidk. Arch. 4: 336. 1958 syn. sec. Taylor & Zappi 20043
- –Melocactus margaritaceus, Melocactus Bras.: 76. 1982, nom. inval., syn. sec. Taylor & Zappi 20044
- –Melocactus margaritaceus var. disciformis, Melocactus Bras.: 78. 1982, nom. inval., syn. sec. Taylor & Zappi 20045
- –Melocactus margaritaceus var. salvadorianus, Melocactus Bras.: 78. 1982, nom. inval., syn. sec. Taylor & Zappi 20046