Index of plants by genus
| Species | Common Name | Family |
| Nabalus albus | White Rattlesnake-root | Asteraceae |
| Nabalus altimissus | Tall Rattlesnake-root | Asteraceae |
| Nabalus autumnalis | Slender Rattlesnake-root | Asteraceae |
| Nabalus boottii | Boott's Rattlesnake-root | Asteraceae |
| Nabalus trifoliatus | Gall-of-the-Earth | Asteraceae |
| Najas flexilis | Slender Naiad | Najadaceae |
| Najas guadalupensis | Southern Naiad | Najadaceae |
| Napaea dioica | Glade Mallow | Malvaceae |
| Narthecium americanum | Bog Asphodel | Nartheciaceae |
| Nelumbo lutea | American Lotus | Nymphaeaceae |
| Nemopanthus mucronatus | Common Mountain Holly | Aquifoliaceae |
| Neottia bifolia | Southern Twayblade | Orchidaceae |
| Neottia convallarioides | Broad-leaved Twayblade | Orchidaceae |
| Neottia cordata | Heart-leaved Twayblade | Orchidaceae |
| Nuphar advena | Yellow Pond Lily | Nymphaeaceae |
| Nymphaea odorata | Fragrant White Waterlily | Nymphaeaceae |
| Nymphoides cordata | Little Floating-heart | Menyanthaceae |
| Nyssa sylvatica | Black Tupelo | Nyssaceae |
© 2004 Michael Hough