| 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 |
| Packera bellidifolia (Kunth) W.A. Weber & Á. Löve, 1981 |
| Packera candidissima (Greene) W.A. Weber & Á. Löve, 1981 |
| Packera coahuilensis (Greenm.) C. Jeffrey, 1992 |
| Packera hintoniorum (B.L. Turner) C. Jeffrey, 1992 |
| Packera loratifolia (Greenm.) W.A. Weber & Á. Löve, 1981 |
| Packera millelobata (Rydb.) W.A. Weber & Á. Löve, 1981 |
| Packera montereyana (S. Watson) C. Jeffrey, 1992 |