Mammillaria sempervivi A P de Candolle 1828

Plants solitary at first, later forming clumps and not rising much above ground level. Taproots large. Stems flattened globose to depressed globose, dull gray-green, 7-10 cm (2.83.9 in) in diameter. Tubercles pyramidal, firm, with latex, axils woolly. Central spines 2-3, short, stout, reddish brown to black, becoming gray with age, to 4 mm long. Radial spines usually on young stems only, 2-6, white, bristle-like, to 3 mm long. Flowers funnelform, barely rising above the tubercles, dingy white to pale yellow, to 10 mm (0.4 in) long and in diameter. Fruits club shaped, red, to 10 mm (0.4 in) long. Seeds brown. Distribution: Hidalgo, San Luis Potosí, Nuevo León, Guanajuato, and Querétaro, Mexico.

Mammillaria sempervivi

Mammillaria scrippsiana

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