Small offsetting Mammillaria with white flowers from north-central Mexico. 0-2 central spines, 3-11 radial spines. From San Luis Potosí, Guanajuato, and Querétaro.

Provide strong light and excellent drainage. Avoid deep pots and do not overwater.

Three subspecies are recognized: Biznaga Enganosa (Mammillaria decipiens subsp. decipiens) (5-11 whitish radial spines); Biznaga Blanquecina (Mammillaria decipiens subsp. albescens) (3-5 short, white radial spines); and Bird's Nest Mammillaria (Mammillaria decipiens subsp. camptotricha) (4-5 long, bristly, somewhat curved radial spines; from Querétaro). The latter subspecies is a nice looking plant due to its spines.

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