| Psilactis odysseus (G.L. Nesom) D.R. Morgan, 1993 |
| Psilactis tenuis S. Watson, 1891 |
| Psilocarphus Nutt., 1840 |
| Psilocarphus brevissimus Nutt., 1840 |
| Psilocarphus chilensis Remy, 1886 |
| Psilocarphus oregonus Nutt., 1840 |
| Psilocarphus oregonus var. brevissimus (Nutt.) Jeps., 1901 |
| Psilocarphus tenellus Nutt., 1840 |
| Psilostrophe DC., 1838 |
| Psilostrophe cooperi (A. Gray) Greene, 1891 |
| Psilostrophe gnaphalodes DC., 1838 |
| Psilostrophe gnaphalodes var. gnaphalodes DC., 1838 |
| Psilostrophe gnaphalodes var. mexicana (R.C. Br.) B.L. Turner, 1988 |
| 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 |