Plants shrubby with inclined to erect branches. Stems cylindrical, 2.5-3 cm (1-1.2 in) in diameter. Ribs as many as 17, notched. Central spines usually 4, needle-like, amber to light yellow, one directed downward, another upward. Radial spines 17-18, thin, white. Flowers red, to 5 cm (2 in) long and 1.6 cm (0.6 in) in diameter; perianths expanded. Distribution: Paraguay. There is serious question whether, in fact, Cleistocactus grossei exists. Ritter (1979-1981) questioned whether it is a good species or not.
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