| Harpagonella A. Gray, 1876 |
| Harpagonella palmeri A. Gray, 1876 |
| Harpagonella palmeri var. arizonica I.M. Johnst., 1924 |
| Johnstonella Brand, 1925 |
| Johnstonella albida (Kunth) M.E.Mabry & M.G. Simpson, 2019 |
| Johnstonella angelica (I.M. Johnst.) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella angustifolia (Torr.) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella costata (Brandegee) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella echinosepala (J.F. Macbr) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella fastigiata (I.M. Johnst.) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella geohintonii (B.L. Turner) M.G. Simpson & R.B. Kelley, 2019 |
| Johnstonella grayi (Vasey & Rose) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella grayi var. cryptochaeta (J.F. Macbr.) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella grayi var. nesiotica (I.M. Johnst.) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella gypsites (I.M. Johnst.) Hasenstab & M.E.Mabry, 2019 |
| Johnstonella holoptera (A. Gray) Hasenstab & M.G. Simpson, 2021 |
| Johnstonella mexicana (Brandegee) M.E. Mabry & M.G. Simpson, 2019 |
| Johnstonella micromeres (A. Gray) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella pusilla (Torr. & A. Gray) Hasenstab & M.G. Simpson, 2012 |
| Johnstonella racemosa (S. Watson ex A. Gray) Brand, 1925 |