| Forasaccus mollis (L.) Bubani, 1901 |
| Fourniera Scribn., 1897 |
| Fourniera mexicana Scribn., 1897 |
| Frumentum E.H.L. Krause, 1898 |
| Fussia Schur, 1866 |
| Fussia caryophyllea (L.) Schur, 1866 |
| Gastridium P. Beauv., 1812 |
| Gastridium australe P. Beauv., 1812 |
| Gastridium lendigerum (L.) Desv., 1818 |
| Gastridium phleoides (Nees & Meyen) C.E. Hubb., 1954 |
| Gastridium scabrum C. Presl, 1826 |
| Gastridium ventricosum (Gouan) Schinz & Thell., 1913 |
| Gastropyrum (Jaub.) Á. Löve, 1982 |
| Geminata Hitchc.& Chase ex Honda, 1930 |
| Genea (Dumort.) Dumort., 1868 |
| Genea Dumort., 1823 |
| Genea madritensis (L.) Dumort., 1868 |
| Genea maxima (Desf.) Dumort., 1868 |
| Genea rigida (Roth) Dumort., 1868 |
| Genea sterilis (L.) Dumort., 1868 |