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Senecioneae is the largest tribe of Asteraceae, comprised of ca. 150 genera and 3,000 species. Approximately one‐third of its species are placed in Senecio, making it one of the largest genera of flowering plants. Despite considerable efforts to classify and understand the striking morphological diversity in Senecioneae, little is known about its intergeneric relationships. This lack of phylogenetic understanding is predominantly caused by conflicting clues from morphological characters, the large size of the tribe, and the absence of a good delimitation of Senecio. Phylogenetic analyses of nrITS and plastid DNA sequence data were used to produce a hypothesis of evolutionary relationships in Senecioneae and a new, monophyletic, delimitation of Senecio. The results of separate and combined phylogenetic analyses of the two datasets were compared to previous taxonomic treatments, morphological and …