Plants treelike, 4-8 m (13-26 ft) high, usually branching about 2 m (6.6 ft) above the ground. Stem segments erect, gray-green, becoming bluish, 10-35 cm (3.9-14 in) long, 10-13 cm (3.9-5.1 in) in diameter. Ribs 8-16,1-2 cm (0.40.8 in) high. Spines needle-like, gray with dark tips. Central spines 1-3, spreading, 2-10 cm (0.8-3.9 in) long. Radial spines 6-12, diverging, a few millimeters long. Flowers not known. Fruits gray-green, to 7 cm (2.8 in) long. Distribution: valley of the Maranon, Peru. Armatocereus arduus is poorly known.
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