| Galarhoeus Haw., 1812 |
| Galarhoeus trichotomus (Kunth) Small, 1933 |
| Galurus Spreng., 1817 |
| Garcia Vahl, 1792 |
| Garcia nutans Vahl, 1792 |
| Garcia parviflora Lundell, 1945 |
| Garciinae Müll. Arg., 1865 |
| Geiseleria Klotzsch, 1841 |
| Geiseleria chamaedryfolia Klotzsch, 1843 |
| Geiseleria corchorifolia Klotzsch, 1843 |
| Guya Frapp. ex Cordem., 1895 |
| Gymnalypha Griseb., 1858 |
| Gymnanthes Sw., 1788 |
| Gymnanthes actinostemoides Müll. Arg., 1863 |
| Gymnanthes guatemalensis Standl. & Steyerm., 1944 |
| Gymnanthes insolita Ferris, 1927 |
| Gymnanthes longipes Müll. Arg., 1865 |
| Gymnanthes lucida Sw., 1788 |
| Gymnanthes pavoniana Müll. Arg., 1863 |
| Gymnanthes riparia (Schltdl.) Klotzsch, 1841 |