1923 needle mulee
Plants solitary, globose to ovoid cylindrical, pale blue-gray to blue-green, 10-17 cm (3.9-6.7 in) high, 8-15 cm (3.1-5.9 in) in diameter. Tubercles hemispheric to broadly conical, to 20 mm (0.8 in) long, axils naked, sometimes with red glands. Central spine one, straight, very rigid, usually erect, whitish to blackish, 20-50 mm (0.8-2 in) long. Radial spines 8-14, reddish brown, lower ones similar to the central, upper ones tufted, slender. Flowers yellow or pale purplish pink, 4-6 cm (1.6-2.4 in) in diameter. Fruits green, to 50 mm (2 in) long. Distribution: Chihuahua, Coahuila, Durango, and possibly San Luis Potosí, Mexico.
Coryphanthapotosiana (Jacobi) Glass and R. Foster 1970 Mammillaria potosiana Jacobi 1856
Plants solitary, globose, gray-green, to 8 cm (3.1 in) in diameter. Tubercles small, conical, to 8 mm (0.3 in) long, axils and furrows with yellowish orange glands. Central spine usually absent, sometimes one, erect, yellowish with dark tip, bent downward slightly, 15-23 mm (0.6-0.9 in) long. Radial spines 12-18, whitish with brown tips, radiating, interlacing. Flowers pale tan to cream, to 2.2 cm (0.9 in) long and 2 cm (0.8 in) in diameter. Fruits dull green, becoming tan, to 1.2 cm (0.5 in) long. Distribution: San Luis Potosí, Mexico.
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