A new species from the Malesherbia sect. Malesherbia is described for the department of Lima, Peru. Malesherbia anxia is found in arid areas of the valley of the Chancay River (Huaral, Lima), on the western slope of the Andes, between 1,580 to 2,600 m. This species has morphological affinities with M. weberbaueri and M. splendens. A key for the identification of other related species is presented, accompanied by a comparative table of diagnostic morphological characters. With this taxonomic novelty, the number of Malesherbia species in Peru rises to 14, of which 12 are endemic.
