Cirsium arizonicum var. chellyense

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R. J. Moore and C. Frankton (1974b) recognized three narrowly defined new species in the Cirsium arizonicum complex, all from a small area in the Defiance Plateau and Chuska Mountains in northeastern Arizona and northwestern New Mexico. The characters used to differentiate these taxa break down when additional specimens are examined, and they are all combined here as a single variety of C. arizonicum.