Sclerocactus glaucus is a species oringin to the middle-northern Colorado, and one of the most northern species among the genus. It is characteristic of powdery blue color as scientific name and the straight spine which is not hooked.
　In habitat many of them are scattered at riverside clayey plains. Body is 5-9cm across and 5-30cm high. it's flower is pink-purple and 3-4cm across and 5-6cm long. They have 8-15 ribs and the rib is sometime tuberculous.
　On the classification there are different opinions about the matter if S.wetlandicus which is distributed north-east Utah is include "glaucus". Heil and Porter declare that the two species are the same, against Hochstatter's opinion. Mature specimen of S.glaucus and S.wetlandicus have a lot of characteristics as the spination or flower feature in common. But their seed or juvenileplant are somewhat different and the habitat of wetlandicus and glaucus are too far apart to cross pollinate. So I think it is to be advisable that they are covered to acknowledge each independent value from a point of preservation at least.

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