| Poidium Nees, 1836 |
| Poinae Dumort., 1829 |
| Pollinia Spreng., 1815 |
| Pollinia brevifolia (Sw.) Spreng., 1815 |
| Pollinia fastigiata (Sw.) Spreng., 1815 |
| Pollinia microstachya (Desv. ex. Ham.) Desv., 1831 |
| Pollinia scoparia (Michx.) Spreng., 1815 |
| Pollinia vaginata Spreng., 1815 |
| Polyantherix Nees, 1838 |
| Polyantherix (Nees) J.G. Sm., 1899 |
| Polyantherix hystrix (Nutt.) Nees, 1838 |
| Polyneura Peter, 1929 |
| Polyodon Kunth, 1815 |
| Polyodon distichus Kunth, 1815 |
| Polyodon texanus (S. Watson) Nash, 1903 |
| Polypogon Desf., 1798 |
| Polypogon adscensionis Trin., 1841 |
| Polypogon alopecuroides Buckley, 1862 |
| Polypogon alpestris (Kunth) Spreng., 1825 |
| Polypogon australis Brongn., 1829 |