Melocactus violaceus Pfeiff. [ Melocactus meonacanthus Link & Otto]
      

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6 656210 Melocactus violaceus Pfeiff. Cactaceae
H.F. Link, C.F. Otto, Die Gattungen Melocactus und Echinocactus: p. 429, t. 15 (1827) [C.W. Röthig]