Mammillaria boelderliana Wohlschlager 1988
Plants solitary. Roots tuberous. Stems flattened globose, blue-green, 1-3 cm (0.4-1.2 in) high, 2.5-5.5 cm (1-2.2 in) in diameter. Roots long, thick. Tubercles widely separated, conical, axils naked. Spines 4-5, needle-like, yellowish brown, 4-7 mm (to 0.3 in) long. Flowers funnelform, whitish with pinkish midveins, 18-20 mm (0.7-0.8 in) long, 20-24 mm (0.8-0.9 in) in diameter. Fruits pear shaped, red, 7-10 mm (0.3-0.4 in) long. Seeds dark brown or black. Distribution: Zacatecas, Mexico.
Mammillaria bombycina Quehl 1910 Neomammillaria bombycina (Quehl) Britton & Rose 1923, Chilita bombycina (Quehl) Orcutt 1926, Ebnerella bombycina (Quehl) Buxbaum 1951
Plants often forming clumps to 80 cm (31 in) wide. Stems depressed globose to club shaped, bright green, 7-14 cm
(2.8-5.5 in) high, 5-6 cm (2-2.4 in) in diameter. Tubercles conical to cylindrical, firm, occasionally with latex, axils with dense white wool and bristles. Central spines 3-8, yellow with dark tips or reddish brown, lowermost one hooked and to 20 mm (0.8 in) long, others straight and to 11 mm (0.4 in) long. Radial spines 30-64, stiff, thin, needle-like, glassy white, to yellowish white to 8 mm (0.3 in) long. Flowers funnelform, pink to white, to 15 mm (0.6 in) long and in diameter. Fruits pale pinkish green. Seeds dark reddish brown, with partially lateral hilum. Distribution: Aguascalientes and Jalisco, Mexico.
Mammillaria boolii G. E. Lindsay 1953 Chilita boolii (G. E. Lindsay) Buxbaum 1954
Plants usually solitary, occasionally clustering. Stems globose to short cylindrical, pale gray-green, to 3.5 cm (1.4 in) high and 3 cm (1.2 in) in diameter. Tubercles round, without latex, axils naked. Central spine one, awl-like, strongly hooked, yellow to yellowish brown, with darker tip, 15-20 mm (0.6-0.8
Mammillaria bocasana subsp. eschauzieri
Mammillaria bocasana subsp. eschauzieri in) long. Radial spines about 20, needle-like, flattened against the stem surface, white, spreading, to 15 mm (0.6 in) long. Flowers pink or lavender-pink, to 25 mm (1 in) long and in diameter. Fruits long, club shaped, orange. Seeds black. Distribution: Sonora, Mexico.
Continue reading here: Mammillaria brachytrichion J M Luthy 1987
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