Abstract
A new species of Tagetes, T. imbricata, is described and photographed. This species that grows in northwestern Argentina and Bolivia is characterized by annual habit, lax terminal corymbiform inflorescences, partially purplish 5-lobed involucres, and imbricated ray flowers with yellowish-white corollas. A taxonomic description complemented with photographs and a map of geographical distribution is provided. In addition, a detailed comparison of the new species and its closely morphologically similar species is also presented, as well as a key to differentiate annual species of Tagetes that grow in northwestern Argentina and Bolivia.
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