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| Common Name | Scientific Name | |
| Naiad, Brittleleaf | Najas minor | |
| Nettle, Stinging | Urtica dioica | |
| New York Ironweed | Vernonia noveboracensis | |
| Nightshade, Bittersweet | Solanum dulcamara | |
| Nightshade, Black | Solanum nigrum | |
| Nightshade, Eastern Black | Solanum ptycanthum | |
| Nightshade, Silverleaf | Solanum eleagnifolium | |
| Nimblewill | Muhlenbergia schreberi | |
| Nutsedge, Purple | Cyperus rotundus | |
| Nutsedge, Yellow | Cyperus esculentus |
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