Compass Barrel Cactus
Synonym: Echinocactus acanthodes, Echinocactus rostii, Ferocactus acanthodes var. rostii, Ferocactus rostii, Echinocactus acanthodes var. rostii, Ferocactus acanthodes, Echinocactus cylindraceus, Echinocactus viridescens var. cylindraceus, Thelocactus hertrichii, Echinocactus hertrichii
This cactus was known for years as Ferocactus acanthodes, until the name was found invalid. The valid name is now F. cylindraceus.
The Compass Barrel Cactus grows slanted in the direction of the south. This is due to the fact that the northern side in the cactus, somewhat protected from the sun grows faster than the south side. The picture is taken from the south side.
The different varieties are distinguished by the shape and color of the spines, although the spine color can vary widely within the same population.
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