Mammillaria varieaculeata Buchenau 1966

Plants forming clusters from offsets, sometimes dividing dichotomously. Stems globose to cylindrical, green to dark green, to 13 cm (5.1 in) or more high and 9 cm (3.5 in) in diameter. Tubercles pyramidal, axils with 10-25 white bristles

4-8 mm (to 0.3 in) long. Central spines 1-5, fewer with age, needle-like, light brown, becoming darker with age, 5-10 mm (0.2-0.4 in) at first, later to 25 mm (1 in) long. Radial spines 17-24, white, yellowish brown basally, later dark brown, 4-8 mm (to 0.3 in) long. Flowers red, to 15 mm (0.6 in) long and in diameter. Fruits club shaped, scarlet, 15-20 mm (0.6-0.8 in) long. Seeds brown. Distribution: Puebla, Mexico.

Mammillaria vetula Martius 1832 Chilita vetula (Martius) Orcutt 1926

Mammillaria gracilis Pfeiffer 1838, M. vetula subsp .gracilis (Pfeiffer)

D. R.Hunt 1997 Mammillaria magneticola J. Meyrán 1961 Mammillaria kuentziana P. Fearn & B. Fearn 1963, not validly published

Plants freely clustering to form flat-topped mounds. Stems globose to cylindrical, glossy blue-green, to 10 cm (3.9 in) in diameter. Tubercles firm to slightly flabby, bluntly conical, four-sided basally, without latex, axils slightly woolly or naked. Central spines 1-2, sometimes absent, reddish brown, straight, stout, needle-like, to 10 mm (0.4 in) long. Radial spines 11-25 at first, later as many as 50, or only 11-16, white, thin, straight, needle-like, 3-10 mm (to 0.4 in) long. Flowers lemon yellow, to 17 mm (0.7 in) long. Fruits whitish to greenish. Seeds black. Distribution: Hidalgo, Guanajuato, and Queretaro, Mexico.

Two subspecies of Mammillaria vetula are recognized. Subspecies vetula typically has 1-2 central spines, at least 25 radials, and flowers to 15 mm (0.6 in) or more long; it occurs at high elevations in Hidalgo, Guanajuato, and Queretaro. Subspecies gracilis often lacks central spines, has only 11-16 radials, and flowers to only 12 mm (0.5 in) long; it occurs in both Hidalgo and Queretaro.

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