| Nabalus altissimus | Tall Rattlesnake-root |
| Nabalus serpentarius | Lion's-foot Rattlesnake-root |
| Narcissus pseudonarcissus | Daffodil |
| Nasturtium officinale | Watercress |
| Nelumbo lutea | American Lotus |
| Neottia bifolia | Southern Twayblade |
| Nepeta cataria | Catnip |
| Nuphar advena | Spatterdock |
| Nuphar lutea subsp. advena | Spatterdock |
| Nuttallanthus canadensis | Old-field Toadflax |
| Nymphaea odorata subsp. odorata | Waterlily |