Illinois Bundleflower
Illinois Pinweed
Illinois Pondweed
Indian Cucumber
Indian Goosegrass
Indian Lovegrass
Indian Mallow
Indian Plantain
Indian Strawberry
Indian Woodoats
Indian-tobacco
Indiangrass
Indianhemp
Indianpipe
Inflated Narrow-leaf Sedge
Intermediate Woodfern
Interrupted Fern
Iris
Ironweed
Italian Ryegrass
Ivy
Ivyleaf Morning-glory
Ivyleaf Speedwell