Senecio anastasioi Montesinos, a new species of Asteraceae / Compositae: Senecioneae allied to Senecio ser. Suffruticosi subser. Caespitosi, is described from the Andean regions located in South Peru. In morphological terms, S. anastasioi is similar to S. gamolepis Cabrera but clearly distinguished by its larger habit size, irregular arrangement of leaves, greater length and width of leaves, leaf lamina covered by scarce fimbriate or sericeous trichomes, capitules with larger, calycular bracts and phyllaries, both densely pubescent apically, and longer pedicels and pappus bristles. The morphological differences between these species are identified and further discussed. The preliminary IUCN status for the new species is assessed.

Keywords: Asteraceae, Senecio subser. Caespitosi, South America, taxonomy, Trey Anastasio

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