Cereus argentinensis Britton Rose 1920

Plants treelike, 8-12 m (26-39 ft) high with numerous erect branches and distinct trunks. Stems stout, curved basally but later erect, green, 10-15 cm (3.9-5.9 in) in diameter. Ribs 4-5, thin, widely separated, 4-5 cm (1.6-2 in) high. Central spines 1-2, to 10 cm (3.9 in) long. Radial spines 5-8, brown, 3-5 cm (1.2-2 in) long. Flowers funnelform, 17-22 cm (6.7-8.7 in) long, without scent, white. Fruits smooth. Distribution: Chaco Central region of Argentina.

Cereus bicolor Rizzini & A. Mattos 1985

Plants shrubby, branching basally, 2-3 m (6.6-9.8 ft) high. Stems cylindrical, blue-green, to 90 cm (35 in) long, 6-9 cm (2.4-3.5 in) in diameter. Ribs 7-8, erect, straight, obtuse, to 25 mm (1 in) high. Areoles with whitish wool, 10-15 mm (0.4-0.6 in) apart. Spines sharp, bicolored with dark bases and lighter tips. Central spines 3-5, one longer than the others, 12-45 mm (0.5-1.8 in) long. Radial spines 6-8, 4-15 mm (to 0.6 in) long. Flowers white, 18-19 cm (7.1-7.5 in) long. Distribution: Mato Grosso, Brazil.

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