Mammillaria morganiana Tiegel 1933

Plants solitary at first, later branching dichotomously and forming clumps. Stems globose to short cylindrical, depressed apically, bright blue-green, to 8 cm (3.1 in) in diameter. Tubercles pyramidal, with latex, axils with fine hairs to 20 mm (0.8 in) long. Central spines 4-5, straight, needlelike, white with brown tips, to 10 mm (0.4 in) long. Radial spines 40-50, white, fine, needle- to hairlike, twisting and interlacing, to 12 mm (0.5 in) long. Flowers cream to pink, with deep pink midveins, to 15 mm (0.6 in) long and in diameter. Fruits red. Seeds brown. Distribution: Guanajuato, Mexico.

Mammillaria muehlenpfordtii Förster 1847 Mammillaria celsiana Lemaire 1839, rejected name Mammillaria neopotosina R. T. Craig 1945

Plants usually solitary, sometimes branching dichotomously. Stems globose, massive, blue-green to gray-green, 12-15 cm

(4.7-5.9 in) in diameter. Tubercles conical, without latex, axils with white bristles. Central spines 4, rarely 2-6, pointing outward, brownish yellow, becoming gray with brown tips, extremely variable in length, 2-40 mm (to 1.6 in), lowermost longest. Radial spines 30-50, glassy white or yellowish, bristle-like, radiating, nearly covering the body, to 4 mm long. Flowers carmine red, 10-15 mm (0.4-0.6 in) long. Fruits red. Seeds brown. Distribution: Querétaro, Guanajuato, and San Luis Potosí, Mexico.

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