Melocactus pachycephalus N.P.Taylor in Phytotaxa 470(3): 256. 2020
Melocactus pachycephalus in Phytotaxa 470(3): 256. 2020
is new name for Melocactus pachyacanthus subsp. viridis in Bradleya 9: 40–41. 1991
is new name for Melocactus viridescens in Cactology 5 (Suppl. 8): 3. 2020