Melocactus caesius H.L.Wendl., Monogr. Melocacti: 104. 1840
Melocactus caesius, Monogr. Melocacti: 104. 1840
is basionym for Melocactus curvispinus subsp. caesius in Bradleya 9: 75. 1991
is basionym for Melocactus curvispinus f. caesius in Bradleya 9: 75. 1991
is basionym for Cactus caesius in Bull. Dept. Agric. Trinidad & Tobago 19: 86. 1921