Mammillaria columbiana - Cacti and Succulents

Mammillaria columbiana

I regard this species designation as VERY tentative

Scientific classification

Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Cactaceae

                         – Wikipedia.

Comment on this plant

The identifications on these pages are tentative

I would appreciate any corrections