Abstract
Perityle vigilans is described from the Sierra Madre Occidental of southwestern Chihuahua. It differs from other Perityle by the combination of its white ligules, sparsely setose- hispid achenes, finely grayish-villosulous tomentum, and absence of pappus bristles. The new species is believed to be most closely related to P. rosei and P. trichodonta, which occur about 800 km to the south. A key is presented that distinguishes the 12 known taxa of Perityle occurring in the northern Sierra Madre Occidental, an area of high diversity in the genus.
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