| Gymnanthes schlechtendaliana Müll. Arg., 1863 |
| Gymnanthes treculiana Müll. Arg., 1865 |
| Gymnostillingia Müll. Arg., 1863 |
| Gymnostillingia macrantha Müll. Arg., 1863 |
| Gynamblosis Torr., 1853 |
| Halecus Rumph. ex Raf., 1838 |
| Halliophytum I.M. Johnst., 1923 |
| Halliophytum capense (I.M. Johnst.) I.M. Johnst., 1923 |
| Halliophytum fasciculatum (S. Watson) I.M. Johnst., 1923 |
| Halliophytum fasciculatum var. hallii (Brandegee) McMinn, 1939 |
| Halliophytum hallii (Brandegee) I.M. Johnst., 1923 |
| Hasskarlia Baill., 1860 |
| Hebecocca Beurl., 1856 |
| Hebecocca panamensis (Klotzsch) Beurl., 1856 |
| Hecatea Thouars, 1804 |
| Hemecyclia Wight & Arn., 1833 |
| Hendecandra Eschsch., 1826 |
| Hendecandra texensis Klotzsch, 1841 |
| Heptallon Raf., 1825 |
| Hermesia Kunth ex Willd., 1806 |