Melocactus viridescens Guiggi in Cactology 5 (Suppl. 8): 3. 2020

is replaced synonym for Melocactus pachycephalus N.P.Taylor in Phytotaxa 470(3): 256. 2020

non Melocactus viridescens Nutt. ex Teschem. in J. Boston Soc. Nat. Hist. 5: 293. 1845 nec Melocactus viridescens Nutt. ex Teschem. in J. Boston Soc. Nat. Hist. 5: 293. 1845

Taxon for this name