Abstract
Phlox pattersonii, a new species from the northern Sierra Madre of Coahuila and Nuevo Leon, Mexico is described. It is morphologically similar toP. pilosa var.ozarkana of the east-central United States, but differs in its suffruticose habit, alternate upper leaves, many nodes, and summer blooming period. None of the subsections ofPhlox can accommodate the new species as currently circumscribed, though it is clearly allied to subsectionsDivaricatae andDrummondianae. A new circumscription of subsect.Divaricatae is proposed which includes subsect.Drummondianae andP. pattersonii.
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