⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-2781966, with some changes.
This name is a synonym of Echinocactus horizonthalonius Lem..
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Pacif. Railr. Rep. Parke, Bot. 4: 32 1857.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:131928-1.