| Psilostrophe hartmanii Rydb., 1914 |
| Psilostrophe mexicana R.C. Br., 1974 |
| Psilostrophe tagetina (Nutt.) Greene, 1891 |
| Psilostrophe villosa Rydb. ex Britton, 1901 |
| Ptarmica Mill., 1754 |
| Pterocaulon Elliott, 1823 |
| Pterocaulon subvirgatum Malme, 1899 |
| Pterocaulon virgatum (L.) DC., 1836 |
| Pteronia L., 1763 |
| Pteronia porophyllum Cav., 1794 |
| Pteroniinae G.L. Nesom, 2020 |
| Ptilomeris Nutt., 1841 |
| Ptilomeris coronaria Nutt., 1841 |
| Ptilostephium Kunth, 1818 |
| Ptilostephium coronopifolium Kunth, 1818 |
| Pyrethrum Medik., 1775 |
| Pyrethrum parthenium (L.) Sm., 1800 |
| Pyrrhopappus DC., 1838 |
| Pyrrhopappus carolinianus (Walter) DC., 1838 |
| Pyrrhopappus pauciflorus (D. Don) DC., 1838 |