Xerophyte

Habit

Usually solitary, (or clumps forming over time)

Central Spines

None.

Seeds

Black.

Forma Rubra

The red schizochromic form (Mammillaria sanchez-mejoradae f. rubraSN|10779]]SN|26145]]) has bright orange-red stems due to the absence (or reduced production) of chlorophyll pigments

Tubercles

Conical, without latex, axils naked.

Flowers

Campanulate,up to 16 mm long and 20 mm in across variable from white to pink-rose.

Stem

Flattened-globose or globose, bright green to 3 cm high, 1-3 cm in diameter.

Radial Spines

30 to 40 hairlike (or plumose) pectinate, rigid, white, flattened against the tubercles, 1,5-2 mm long (rarely up to 3 mm) long.

Fruits

Club shaped to globose, completely embedded in the plant (cryptocarpic), red, 3-8 mm in diameter.