| Grindelia oxylepis var. eligulata Steyerm., 1934 |
| Grindelia palmeri Steyerm., 1934 |
| Grindelia pusilla (Steyerm.) G.L. Nesom, 1992 |
| Grindelia robinsonii Steyerm., 1934 |
| Grindelia robusta Nutt., 1840 |
| Grindelia scabra Greene, 1898 |
| Grindelia squarrosa (Pursh) Dunal, 1819 |
| Grindelia squarrosa var. hirtella B.L. Rob. & Greenm., 1895 |
| Grindelia subdecurrens DC., 1836 |
| Grindelia sublanuginosa Steyerm., 1934 |
| Grindelia tenella Steyerm., 1934 |
| Grindelia tricuspis (Sch. Bip.) A. Bartoli & Tortosa, 2011 |
| Grindelia turneri G.L. Nesom, 1990 |
| Grindelia vetimontis G.L. Nesom, 1990 |
| Grindelia villarrealii G.L. Nesom, 1992 |
| Grypocarpha Greenm., 1903 |
| Grypocarpha nelsonii Greenm., 1903 |
| Guardiola Cerv. ex Humb. & Bonpl., 1807 |
| Guardiola angustifolia (A. Gray) B.L. Rob., 1899 |
| Guardiola arguta (A. Gray) B.L. Rob., 1899 |