Plants freely clustering to form large clumps of more than 100 stems. Stems cylindrical, green, 5-20 cm (2-7.9 in) high, 2-5 cm (0.8-2 in) in diameter. Tubercles obtuse, without latex, axils with some wool. Central spines usually 4, straight, sometimes one hooked, needle-like, white with brown tips, to 8 mm (0.3 in) long. Radial spines 15-25, spreading, white, 6-8 mm (0.2-0.3 in) long. Flowers white to cream, to 15 mm (0.6 in) long. Fruits club shaped, red, to 15 mm (0.6 in) long. Seeds brown. Distribution: San Pedro Nolasco Island, Gulf of California, Mexico.
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