Lewisia taylorii J.O'Brien, C.M.Guilliams, S.A.Puentes, & L.Lindstrand (Montiaceae) is described as a new species from northern California. The new taxon is a low, scapose perennial herb growing from a short, thick, single or multi-branched fleshy taproot. When discovered, the taxon best fit the description of L. kelloggii K.Brandegee subsp. hutchisonii Dempster, though morphological traits visible in the field suggested it might be a novel species. Recent morphometric and genetic analysis confirmed this suspicion. The new species is currently known from four general areas in the eastern Klamath Ranges of northeastern Trinity and northwestern Shasta counties, where it occurs on open, often disturbed gravelly-shaley slopes in conifer forest habitat. We describe the morphological and habitat characteristics for L. taylorii and distinguishing characters of L. taylorii and L. kelloggii.