Plants cylindrical, green, to 22 cm (8.7 in) high, 10-17 cm (3.9-6.7 in) in diameter. Ribs 12-16, somewhat high and narrow but with rounded edges. Spines round, usually curved, dull red, becoming black. Central spine usually one, sometimes as many as 4,40-60 mm (1.6-2.4 in) long. Radial spines 8-9, lowermost longest, to 80 mm (3.1 in). Cephalia to 13 cm (5.1 in) high and 6 cm (2.4 in) in diameter, with reddish bristles and white wool. Flowers open in midafter-noon, exserted to 12 mm (0.5 in) above the cephalia, pink, to 37 mm (1.5 in) long, 15-18 mm (0.6-0.7 in) in diameter. Fruits elongate club shaped, red, 30-40 mm (1.2-1.6 in) long, without seeds in lower half. Distribution: northern Ro-raima, Brazil.
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