| Ginannia lanata (L.) F.T. Hubb., 1916 |
| Ginannia pubescens Bubani, 1901 |
| Glandiloba (Raf.) Steud., 1840 |
| Glutinosa Zuloaga, 1978 |
| Glyceria R. Br., 1810 |
| Glyceria borealis (Nash) Batch., 1900 |
| Glyceria brevifolia (Muhl.) Schult., 1824 |
| Glyceria elata (Nash) M.E. Jones, 1910 |
| Glyceria fluitans (L.) R. Br., 1810 |
| Glyceria fluitans var. acutiflora Döll, 1855 |
| Glyceria fluitans var. angustata Vasey ex Fernald, 1895 |
| Glyceria mexicana (Kelso) Beetle, 1981 |
| Glyceria michauxii Kunth, 1829 |
| Glyceria micrantha Steud., 1854 |
| Glyceria neogaea Steud., 1854 |
| Glyceria nervata (Willd.) Trin., 1830 |
| Glyceria nervata var. rigida (Nash) Lunell, 1915 |
| Glyceria rigida (L.) Sm., 1824 |
| Glyceria septentrionalis Hitchc., 1906 |
| Glyceria striata (Lam.) Hitchc., 1928 |