Plants solitary, later forming low clumps, barely rising above ground level. Stems globose, glaucous green to blue-green, to 3 cm (1.2 in) high, 5-6 cm (2-2.4 in) in diameter. Tubercles conical to ovoid, to 17 mm (0.7 in) long, usually without
Coryphantha macromeris subsp. macromeris glands. Central spines absent. Radial spines 4-7, straight, rigid, whitish, 7-13 mm (0.3-0.5 in) long. Flowers yellow to creamy white, to 2.7 cm (1.1 in) long and 4 cm (1.6 in) in diameter. Distribution: San Luis Potosi, Mexico.
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