Abstract
Sclerocactus dawsoniae McGlaughlin & Naibauer (Cactaceae), a new species from western Colorado, is described. Sclerocactus dawsoniae is segregated from S. glaucus (K. Schum.) L. D. Benson, differing by having a smaller overall size, fewer spines per areole, an allopatric distribution, and substantial genetic differentiation.
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