⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-5106163, with some changes.
This name is a synonym of Mammillaria densispina (J.M. Coult.) Orcutt.
The record derives from Tropicos which reports it as a synonym (record 5106163) with original publication details: Cactaceae 4: 119-120, f. 126 119 1923.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:168694-2.