| Odontonema breedlovei V.M. Baum, 1982 |
| Odontonema callistachyum (Schltdl. & Cham.) Kuntze, 1891 |
| Odontonema cuspidatum (Nees) Kuntze, 1891 |
| Odontonema foliaceobracteatum (Oerst.) Kuntze, 1891 |
| Odontonema galbanum Leonard, 1943 |
| Odontonema glaberrimum (M.E. Jones) V.M. Baum, 1982 |
| Odontonema glabrum Brandegee, 1915 |
| Odontonema hondurense (Lindau) D.N. Gibson, 1972 |
| Odontonema mortonii V.M. Baum, 1982 |
| Odontonema strictum (Nees) Kuntze, 1891 |
| Odontonema tubaeforme (Bertol.) Kuntze, 1891 |
| Onychacanthus Nees, 1847 |
| Onychacanthus berlandierianus Nees, 1847 |
| Onychacanthus speciosus Oerst., 1855 |
| Ophthalmacanthus Nees, 1847 |
| Ophthalmacanthus parvus Nees, 1847 |
| Oplonia Raf., 1838 |
| Oplonia armata (Sw.) Stearn, 1971 |
| Pachystachys Nees, 1847 |
| Pachystachys lutea Nees, 1847 |