⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record kew-2813925, and has not been changed.

Frailea perumbilicata var. spinosior F.Ritter is a synonym of Frailea castanea Backeb.

This name is a synonym of Frailea castanea Backeb..

The record derives from WCSP (in review) which reports it as a synonym with original publication details: Kakteen Südamer. 1: 207 1979.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:105550-2.