⚠ Version 1 of The Plant List has been superseded.
This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Melocactus maxonii in version 1.1 of The Plant List.
This name is a synonym of Melocactus curvispinus .
The record derives from Tropicos which reports it as a synonym (record 5107980
) with original publication details: Brenesia 10: 128-129, 127, f. 1-3 128 1977.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:280713-2
.