⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50149156, with some changes.
This name is a synonym of Mammillaria voburnensis subsp. collinsii (Britton & Rose) U. Guzmán.
The record derives from Tropicos which reports it as a synonym (record 50149156) with original publication details: Cactography 7 7 1926.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:150796-2.