Plants solitary, then branching from the sides and bases to form clumps. Stems globose to thick cylindrical, pale green, to 25 cm (9.8 in) or more high, 10-11 cm (3.9-4.3 in) in diameter. Tubercles pyramidal, axils very woolly at first, later sparsely woolly and with a few bristles. Central spines 2-5, similar to the radials. Radial spines 12, slightly curved, orange-brown when young, later white with brown tips, to 9 mm (0.4 in) long. Flowers urn shaped, cherry colored with whitish margins, to 15 mm (0.6 in) long and in diameter. Fruits red. Seeds brown. Distribution: San Pedro Nolasco Island, Sonora, Mexico.
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