Copiapoa brunnescens Backeberg 1959, not validly published
Plants usually solitary, sometimes branched. Taproots large, tuberous. Stems depressed globose to globose, gray-green, very spiny, 5-10 cm (2-3.9 in) in diameter. Ribs 10-21, slightly tuberculate. Areoles separated. Spines awl shaped or needle-like, straight to somewhat curved, yellow to black, becoming gray with age. Central spines 1-6,15-40 mm (0.61.6 in) long. Radial spines 8-10, 5-25 mm (0.2-1 in) long. Flowers yellow, 2.5-4 cm (1-1.6 in) long. Fruits green, with a few scales, to 10 mm (0.4 in) in diameter. Distribution: near the city of Copiapo, Atacama, Chile.
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