Mammillaria luethyi

Mammillaria luethyi
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Caryophyllales Family: Cactaceae Subfamily: Cactoideae Tribe: Cacteae Genus: Mammillaria Species: M. luethyi
Binomial name
Mammillaria luethyi

Wikipedia has an article on Mammilaria.