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Guynesomia (Asteraceae: Astereae), a new genus restricted to the western slopes of the Andes mountains in central Chile, is described. Guynesomia is a shrub characterised by raceme-like or panicle-like capitulescences, disciform capitula, alveolate receptacles, pistillate zygomorphic marginal florets with three or four short lobes, and a pappus of two series of subequal scabrid bristles. Diplostephium is the putative closest relative of Guynesomia. The new combination Guynesornia scoparia is based on Nardophyllum scoparium. [ABSTRACT FROM AUTHOR]