In this work Tigridia riedemanniae Aldunate, Mun` oz -Schick & V. Morales it is described, a new species for Chile and Peru; pointing its distribution, habitat and identification of accompanying species. Additionally, it is compared with Tigridia philippiana I.M.Johnst. and Tigridia arequipensis Montesinos, Pauca & I. Revilla, species to which it shares morphological and ecological affinities. A key for their differentiation is included.