Melocactus curvispinus subsp. caesius (H.L.Wendl.) N.P.Taylor in Bradleya 9: 75. 1991
Melocactus curvispinus subsp. caesius in Bradleya 9: 75. 1991
is new combination for Melocactus caesius, Monogr. Melocacti: 104. 1840
Melocactus curvispinus subsp. caesius in Bradleya 9: 75. 1991