Plants commonly forming clumps basally. Stems cylindrical, to 55 cm (22 in) high, 4-5 cm (1.6-2 in) in diameter. Tubercles conical and slightly four-angled basally, with dilute latex, axils sparsely woolly at first, later naked. Central spines 2, pointing upward and downward, needle-like, straight, brown with yellowish tips, later gray, to 10 mm (0.4 in) long. Radial spines 17-19, straight, brown with lighter tips, later gray, 3-6 mm (to 0.2 in) long. Flowers narrowly funnelform, purple, to 18 mm (0.7 in) long. Fruits club shaped, light purplish pink with greenish tint, to 20 mm (0.8 in) long. Seeds brown. Distribution: Michoacán and México, Mexico.
Mammillaria microhelia Werdermann 1930 Leptocladodia microhelia (Werdermann) Buxbaum 1960 Mammillaria microheliopsis Werdermann 1931, Leptocladodia micro-
heliopsis (Werdermann) Buxbaum 1960 Mammillaria droegeana Hildmann ex Reppenhagen 1987, not validly published
Plants sometimes solitary but usually forming clumps. Stems cylindrical, medium green, to 15 cm (5.9 in) or more high, 35 cm (1.2-2 in) in diameter. Tubercles blunt conical, rounded apically, keeled, without latex, axils slightly woolly, later naked. Central spines 1-4, sometimes absent, occasionally as many as 8, stout, needle-like, straight or curved, reddish brown to yellowish brown, to 11 mm (0.4 in) long. Radial spines 30-50, radiating, straight or slightly curved backward, white to yellowish, 4-6 mm (0.2 in) long. Flowers whitish cream to reddish pink to purple, to 15 mm (0.6 in) long and in diameter. Fruits white, pale green, or pale pink. Seeds brown. Distribution: Querétaro, Mexico.
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