| Nicotiana trigonophylla Dunal, 1852 |
| Nicotianeae G. Don, 1838 |
| Nierembergia Ruiz & Pav., 1794 |
| Nierembergia angustifolia Kunth, 1818 |
| Nierembergia petunioides Dunal, 1852 |
| Nierembergia viscosa Torr., 1859 |
| Noctiflorae Goodsp., 1945 |
| Pachyphylla Dunal, 1813 |
| Parascopolia Baill., 1888 |
| Parascopolia acapulcensis Baill., 1888 |
| Perennans Bitter, 1919 |
| Periloba Raf., 1836 |
| Periloba paradoxa Raf., 1836 |
| Persicariae Dunal, 1813 |
| Petota Dumort., 1827 |
| Petunia Juss., 1803 |
| Petunia axillaris (Lam.) Britton, Sterns & Poggenb., 1888 |
| Petunia hybrida E. Vilm., 1863 |
| Petunia integrifolia (Hook.) Schinz & Thell., 1915 |
| Petunia parviflora Juss., 1803 |