When it comes to Stenocactis species confirmation I'm always in great doubt, unless it is S. coptogonus or S.vaupelianus that are reasonably distinct. Everything else could easily go as forms of S. multicostatus, as the borders between the species are fuzzy.
Stenocacti are among the most sun loving and heat tolerant cacti, and the strongest spination will develop only under the most unforgiving sun.
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