First Description: Monatschr. Kakteenkunde 20: 108. 1910

Body: Solitary, globose to short cylindric, 6 cm high and 4 cm in diameter, with rounded apex.

Roots: Tuberous.

Sap: With watery sap.

Tubercle: Cylindrical, soft, very finely pitted, 10 mm long and 5 mm thick, dark green. Areoles are round, with some white wool at first, later becoming naked.

Axils: Naked.

Radial spines: 20 or more, 10 mm long, uppermost longer and thinner,all acicular,pubescent, glassy white, ascending in youth, later becoming horizontal.

Central spines: 3, 8-13mm long, the middle one the longest and hooked (13mm),bright brown and black at tip; the uppermost and the lowest straight (8mm), acicular, smooth, brown, sometimes coppery brown.

Flowers: Funnelform, 25-30mm long, whitish with reddish brown midveins.

Fruit: Club shaped, red.

Seed: Black.

Geographic Distribution: According to Craig: near La Maria, San Luis Potosi; according to Bödeker in Guanajuato.

Bibliography: Reppenhagen, die Gattung Mammilaria 64; Craig, the Mammillaria Handbook p 212

Photo: HDC.