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In the course of a detailed molecular study of the tribe   Gochnatieae   (  Compositae  :   Gochnatioideae  ) it became apparent that the genus    Gochnatia    (sensu Cabrera) was not monophyletic but composed of a number of morphologically, geographically, and molecularly distinct clades. All but one of these clades had previously been recognized at the generic or sectional level and therefore had a name that could be applied. However, one clade, whose members are from Mexico and adjacent parts of the United States, had never been recognized as a distinct taxon. The Mexican clade is the sister group of the Caribbean clade which seems to indicate a dispersal event from Southern South America to Mexico and from Mexico to the Caribbean. Here we provide the Mexican clade with a genus name,    Nahuatlea   , and make the necessary new combinations. The name is derived from   Nahuatl  , the major indigenous language that is spoken in the area where most of the collections were gathered. A genus description, key to species, images, and a short, species descriptions, are provided.

Nahuatlea : a new genus of compositae ( Gochnatieae ) from North America