Spiny, low, clumping, whitish cactus from northeastern Mexico with pink to red flowers and red fruit. Stems grow to about 6-8 inches tall and are about 3 inches wide. 2-6 straight or somewhat curved central spines, 16-20 radial spines, axils with wool and bristles. Central spines may be quite variable in length.

The type subspecies Mammillaria (Mammillaria geminispina subsp. geminispina) has 2 centrals (white with dark tips) and Biznaga Vestida de Blanco (Mammillaria geminispina subsp. leucocentra) has 5-6 all-white centrals.

Found over a wide area of the Sierra Madre Oriental and Sierra Gorda, from north-central San Luis Potosí and southern Tamaulipas south to Veracruz, including Guanajuato, Querétaro and Hidalgo.

Relatively common in cultivation, where it can grow into large multi headed clumps.

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