| Polypogon subverticillatus (Forssk.) Hyl., 1945 |
| Polypogon tarapacanus Phil., 1891 |
| Polypogon tenellus (Kunth) Spreng., 1825 |
| Polypogon viridis (Gouan) Breistr., 1966 |
| Polyraphis (Trin.) Lindl., 1847 |
| Polyraphis Trin., 1830 |
| Polytrias Hack., 1887 |
| Polytrias indica (Houtt.) Veldkamp, 1991 |
| Ponceletia Thouars, 1811 |
| Pooideae Benth., 1861 |
| Poranthera Raf., 1830 |
| Poranthera ciliata (Elliott) Raf. ex B.D. Jacks., 1894 |
| Poranthera nutans Raf. ex B.D. Jacks., 1894 |
| Porroteranthe Steud., 1854 |
| Preissia Opiz, 1852 |
| Pringleochloa Scribn., 1896 |
| Pringleochloa stolonifera (E. Fourn.) Scribn., 1896 |
| Procerae Ohwi, 1942 |
| Prosphysis Dulac, 1867 |
| Psammophila Schult., 1822 |