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I have now put an explanation of why these two appear not to be the same species after all at Sclerocactus sileri#Taxonomy and Pediocactus sileri#Taxonomy. There are now two separate articles. My apologies for the confusion, which was because editors had been following Anderson (2001) in treating these two as synonyms, which seems to be wrong – at least according to the Flora of North America. Peter coxhead (talk) 12:57, 4 May 2012 (UTC)[reply]
