Tetraneuris is recognized as a genus separate from Hymenoxys and a taxonomic treatment is presented for the 14 taxa recognized as constituting Tetraneuris: T. acaulis var. acaulis, T. acaulis var. arizonica, T. acaulis var. caespitosa, T. acaulis var. epunctata, T. argentea, T. herbacea, T. ivesiana., T. linearifolia var. linearifolia, T. linearifolia var. arenicola, T. scaposa var. scaposa, T. scaposa var. argyrocaulon, T. torreyana, T. turneri, and T. verdiensis. The revision includes synonymies, typifications, descriptions, discussions, and range maps for each of the accepted species.