Plants solitary at first, later forming clusters. Stems flattened globose, gray-green, to 2.5 cm (1 in) high, 4.5-6 cm (1.8-2.4 in) in diameter. Ribs 9-11, shallow, with weak chinlike protrusions. Spines reddish brown to grayish brown, later gray, thin, needle-like, straight to slightly curved. Central spines 1-2, sometimes absent, to 11 mm (0.4 in) long. Radial spines 7-10, pointing sideways or downward, 3-8 mm (to 0.3 in) long. Flowers white with yellowish throats, 4-5.5 cm (1.62.2 in) long, 3-4.5 cm (1.2-1.8 in) in diameter. Fruits usually club shaped, blue-green, to 2 cm (0.8 in) long. Distribution: Córdoba, Argentina.
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