| Oxylobus macrocephalus Paray, 1958 |
| Oxylobus oaxacanus S.F. Blake, 1942 |
| Oxylobus preecei B.L. Turner, 1988 |
| Oxylobus subglabrus R.M. King & H. Rob., 1974 |
| Oxylobus trinervius Moc. ex DC., 1836 |
| Oxypappus Benth., 1845 |
| Oxypappus scaber Benth., 1845 |
| Oxypappus seemannii S.F. Blake, 1930 |
| Oxytenia Nutt., 1848 |
| Oyedaea DC., 1836 |
| Oyedaea lundellii H. Rob., 1979 |
| Oyedaea mexicana Rzed., 1973 |
| Oyedaea ovalifolia A. Gray, 1861 |
| Oyedaea seemannii (Sch. Bip.) A. Gray, 1883 |
| Pachythamnus (R.M. King & H. Rob.) R.M. King & H. Rob., 1972 |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob., 1972 |
| Pachythelia Steetz, 1864 |
| Pachythelia mexicana (Less.) Steetz, 1863 |
| Packera Á. Löve & D. Löve, 1976 |
| Packera actinella (Greene) W.A. Weber & Á. Löve, 1981 |