Plants solitary. Stems globose to short cylindrical, to 20 cm (7.9 in) high, 7-8 cm (2.8-3.1 in) in diameter. Tubercles cylindrical, without latex, axils with scant wool at first, later with curly wool. Central spines 2-4, yellow, becoming brownish or whitish, with dark tips, upper one to 5 mm long, lower to 15 mm (0.6 in) long. Radial spines 19-20, thin, white, 2-4 mm long. Flowers small, light red to pale pinkish red. Fruits yellow below, orange above. Seeds brown. Distribution: Oaxaca and Puebla, Mexico.
Mammillaria duoformis R. T. Craig & E. Y. Dawson 1948 ? Mammillaria hamata Lehmann ex Pfeiffer 1832 ?Mammillaria rossiana Heinrich 1958 Mammillaria erythrocalyx Buchenau 1966 Mammillaria claviformis Reppenhagen 1989
Plants usually forming clumps. Stems cylindrical, to 9 cm (3.5 in) high, 3-4 cm (1.2-1.6 in) in diameter. Tubercles without latex but latex present in the stem, axils with bristles. Central spines 4, pinkish tan below, blackish brown above, 10-12 mm (0.4-0.5 in) long, lowermost one hooked and longer. Radial spines 18-20, slender, needle-like, straight, chalky white to pale yellow above, orange-brown below, 5-7 mm (0.2-0.3 in) long. Flowers bright crimson, to 15 mm (0.6 in) long and 12 mm (0.5 in) in diameter. Fruits pale brownish pink. Seeds brown. Distribution: Puebla, Oaxaca, and Morelos, Mexico.
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