Mammillaria theresae Cutak 1967

Plants usually solitary, sometimes clustering. Taproots stout. Stems subglobose to cylindrical, olive green, sometimes with purplish tint, to 4 cm (1.6 in) high, 1-3 cm (0.4-1.2 in) in diameter. Tubercles cylindrical, axils sparsely woolly. Central spines absent. Radial spines 22-30, plumose, translucent white to yellowish white, to 2 mm long. Flowers funnelform, violet-purple, 35-45 mm (1.4-1.8 in) long, to 30 mm (1.2 in) in diameter. Fruits club shaped, remaining embedded in the body, to 10 mm (0.4 in) long. Seeds black. Distribution: Durango, Mexico.

Continue reading here: Mammillaria thornberi Orcutt 1902

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