| Paspalum virgatum var. subplicatum Hack., 1909 |
| Paspalum virgatum var. undulatum Alph. Wood, 1871 |
| Paspalum virletii E. Fourn., 1886 |
| Paspalum vulnerans Salzm. ex Steud., 1841 |
| Paspalum wagenerianum Schltdl., 1854 |
| Paspalum wrightii Hitchc. & Chase, 1917 |
| Paspalum yecorae Sánchez-Ken, 2010 |
| Paspalum yucatanum Chase, 1929 |
| Patropyrum Á. Löve, 1982 |
| Pechea Lapeyr., 1818 |
| Pectinaria (Benth.) Hack., 1887 |
| Pectinaria Benth., 1881 |
| Pedicellata Hitchc. & Chase, 1910 |
| Pedicellata Hitchc. & Chase ex Freckmann & Lelong, 2002 |
| Peltophorus Desv., 1810 |
| Penicillaria Willd., 1809 |
| Penicillaria spicata (L.) Willd., 1809 |
| Peniculus Swallen, 1932 |
| Peniculus angustifolius Swallen, 1932 |
| Pennisetum Rich., 1805 |