⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-50335381, and has not been changed.

Mammillaria ritteriana var. quadricentralis R.T. Craig bis is a synonym of Mammillaria chionocephala J.A. Purpus

This name is a synonym of Mammillaria chionocephala J.A. Purpus.

The record derives from Tropicos which reports it as a synonym (record 50335381) with original publication details: 1945.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:151608-2.