| Ichnanthus tamayonis Chase, 1952 |
| Ichnanthus tenuifolius K.E. Rogers, 1972 |
| Ichnanthus tenuis (J. Presl & C. Presl) Hitchc. & Chase, 1917 |
| Ichnanthus tipuaniensis K.E. Rogers, 1973 |
| Ichnanthus tonkinensis K.E. Rogers, 1968 |
| Ichnanthus trinitensis Mez, 1918 |
| Ichnanthus venezuelanus Mez, 1918 |
| Ichnanthus venturii K.E. Rogers, 1971 |
| Ichnanthus verticillatus Mez, 1918 |
| Ichnanthus vestitus Swallen, 1964 |
| Ichnanthus vicinus (F.M. Bailey) Merr., 1922 |
| Imperata Cirillo, 1792 |
| Imperata (Triarrhena) Maxim., 1859 |
| Imperata arundinacea Cirillo, 1792 |
| Imperata arundinacea var. africana Andersson, 1855 |
| Imperata arundinacea var. americana Andersson, 1855 |
| Imperata arundinacea var. indica Andersson, 1855 |
| Imperata brasiliensis Trin., 1832 |
| Imperata brasiliensis var. mexicana Rupr., 1842 |
| Imperata brevifolia Vasey, 1886 |