Melocactus violaceus
Melocactus violaceus in Allg. Gartenzeitung 3: 313. 1835 sec. Zappi & Taylor 20201 wfo-0000375270
- ≡Melocactus melocactoides var. violaceus, Melocactus Bras.: 81, 83. 1982 syn. sec. ??? wfo-0001289720
- =Cactus melocactus var. depressus, Hort. Kew. 2: 150. 1789 syn. sec. Kew 20192 wfo-0001430275
- =Cactus melocactoides in Verz. Pfl.-Kult. Nachtr. 3: 24. 1826 syn. sec. Taylor & Zappi 20043 wfo-0000577990
- ≡Melocactus melocactoides, Prodr. 3: 461. 1828 syn. sec. Taylor & Zappi 20043 wfo-0001289714
- =Echinocactus meonacanthus in Verh. Vereins Beförd. Gartenbaues Königl. Preuss. Staaten 3: 428. 1827 syn. sec. Kew 20194 wfo-0000660675
- =Melocactus depressus in Bot. Mag. 65: t. 3691. 1838 syn. sec. Taylor & Zappi 20045 wfo-0001288763
- ≡Cactus depressus, Cacti, ed. 1: 279. 1937 syn. sec. TROPICOS 1988+6 wfo-0000577783
- ≡Melocactus melocactoides var. depressus, Melocactus Bras.: 82. 1982 syn. sec. Taylor & Zappi 20045 wfo-0001289717
- ≡Melocactus melocactoides f. depressus, Melocactus Bras.: 82, 84. 1982 syn. sec. Taylor & Zappi 20045 wfo-0001289718
- =Melocactus goniodacanthus, Cact. Aliq. Nov.: 11. 1838 syn. sec. Kew 20197 wfo-0000375391
- =Cactus meonacanthus, Nomencl. Bot., ed. 2, 1: 246. 1840 syn. sec. Kew 20198 wfo-0000577994
- =Cereus meonacanthus, Nomencl. Bot., ed. 2, 1: 334. 1840 syn. sec. Kew 20199 wfo-0000597355
- =Melocactus parthonii in Nova Acta Phys.-Med. Acad. Caes. Leop.-Carol. Nat. Cur. 18(Suppl. 1): 190. 1841 syn. sec. Taylor & Zappi 200410 wfo-0000375430
- =Melocactus gardenerianus, Handb. Cacteenk.: 277. 1846 syn. sec. Kew 201911 wfo-0000375414
- =Melocactus melocactoides f. civitatis, Melocactus Bras.: 81–83. 1982 syn. sec. WFO 201912 wfo-0001289715
- =Melocactus melocactoides f. exsanguis, Melocactus Bras.: 83–84, f. 52, 54. 1982 syn. sec. WFO 201913 wfo-0001289716
- =Melocactus melocactoides var. itaipuassuensis, Melocactus Bras.: 82, 84. 1982 syn. sec. WFO 201914 wfo-0001289719
- =Melocactus violaceus subsp. natalensis in Cact. Succ. J. (Los Angeles) 69(2): 71. 1997 syn. sec. Taylor & Zappi 200415 wfo-0001432535
- –Melocactus melocactoides f. capensis, Melocactus Bras.: 83. 1982, nom. inval. syn. sec. Kew 201916 wfo-0001432491
- –Melocactus melocactoides f. perspinosus, Melocactus Bras.: 82. 1982, nom. inval. syn. sec. Kew 201917 wfo-0001432492
- –Melocactus melocactoides f. sanctaritae, Melocactus Bras.: 83. 1982, nom. inval. syn. sec. Kew 201918 wfo-0001432493
- –Melocactus melocactoides var. natalensis, Melocactus Bras.: 82, 84. 1982, nom. inval. syn. sec. Taylor & Zappi 200419 wfo-0001432494