Novelties from the Northern Mountains Complex of Madagascar VII: A new species of Senecio L. (Compositae)

A new species of Senecio L. (Compositae) is described from the medium altitude moist evergreen forest of the northern mountains of Madagascar. The species presents morphological affinities with S. francoisii Humbert and S. hadiensis Forssk. but differs, among other characters, in having discoid capitula (vs radiate capitula). According to IUCN Red List Categories and Criteria, a preliminary risk of extinction status of "Vulnerable"is assigned to the new species. A line drawing and field pictures are also provided.