| Common Name | Latin Name |
|---|---|
| Illinois Bundleflower | Desmanthus illinoensis |
| Indian Currant | see Buckbrush |
| Indian Mock-Strawberry | Duchesnea indica |
| Indian Mustard | Brassica juncea |
| Indian Paint | see Bloodroot |
| Indian Woodoats | Chasmanthium latifolium |
| Inland Ironweed | see Baldwins Ironweed |
| Irish Moss | see Cypress Spurge |
| Ironweed | see Baldwins Ironweed |
| Italian Ryegrass | see Annual Ryegrass |
| Ivyleaf Morningglory | Ipomoea hederacea |
