⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-2782179, with some changes.
This name is a synonym of Echinocactus polycephalus subsp. xeranthemoides (J.M.Coult.) N.P.Taylor.
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Contr. U. S. Natl. Herb. 3: 358 1896.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:87635-2.