Melocactus placentiformis (Lehm.) DC., Prodr. 3: 460. 1828
Melocactus placentiformis, Prodr. 3: 460. 1828
is new combination for Cactus placentiformis in Del. Sem. Hort. Hamburg. 1826
Melocactus placentiformis, Prodr. 3: 460. 1828
Taxon for this name