Coryphantha unicornis Boedeker 1928

Plants often solitary but sometimes forming clumps. Roots thick. Stems globose, shiny pale blue-green, 6-8 cm (2.4-3.1 in) in diameter. Tubercles conical, rounded apically, not crowded, to 15 mm (0.6 in) long, axils and spine clusters often with red glands. Central spine one, erect, straight or slightly curved, dark reddish brown, 18-20 mm (0.7-0.8 in) long. Radial spines 7-8, yellow to brownish gray, with dark tips, straight, to 15 mm (0.6 in) long. Flowers rose colored. Fruits green with reddish tint, to 20 mm (0.8 in) long. Distribution: Coahuila, Mexico.

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