Plants sometimes solitary but usually forming clusters. Taproots large. Stems connected to taproots by necks, stems depressed globose, rarely rising above ground level, gray to brown to reddish, 3-6.5 cm (1.2-2.6 in) in diameter. Ribs 10-16, present only as low spiraling tubercles, with grooves running from the areoles to the base. Central spine 0-1, black, to 15 mm (0.6 in) long. Radial spines 1-10, sometimes absent, to 5 mm long. Flowers yellow, 1.5-2.2 cm (0.6-0.9 in) long. Fruits very small, round. Distribution: coastal hills from Chanaral, Antofagasta, south to the vicinity of Puerto Viejo, Atacama, Chile.
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