Abstract
Four new species of Asteraceae are described and illustrated, two belonging to the tribe Senecioneae [Pentacalia (Pentacalia) guambiana y Pentacalia (Microchaete) fimbriifera] and two belonging to the tribe Astereae (Diplostephium fernandez-alonsoi y D. perijaense). Also a new combination and a new synonym are proposed in the genus Oyedaea (Heliantheae).
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