Plants usually solitary with the stems obscured by spines. Roots sometimes large. Stems globose to cylindrical, green, 4-12 cm (1.6-4.7 in) long, 2.5-5.5 cm (1-2.2 in) in diameter. Ribs 16-26, low, slightly tuberculate. Central spines present only on young stems, 1-3, hairlike, brownish, to 15 mm (0.6 in) long. Radial spines 20-28, in two comblike rows, dirty white, to 4 mm long. Flowers borne near the stem tips from very woolly buds, broadly funnelform, bright pink, 5.5-9 cm (2.2-3.5 in) long, 5-9 cm (2-3.5 in) in diameter. Fruits ovoid, nearly dry, dehiscing longitudinally, with dense wool and spines. Distribution: edge of the Sierra de la Paila, Coahuila, Mexico.
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