Illinois Bundleflower
Illinois Pinweed
Illinois Pondweed
Illscented Wakerobin
Incised Agrimony
Indian Blanket
Indian Breadroot
Indian Cucumber
Indian Goosegrass
Indian Heliotrope
Indian Jointvetch
Indian Lovegrass
Indian Mallow
Indian Paintbrush
Indian Plantain
Indian Shot
Indian Strawberry
Indian Woodoats
Indian-tobacco
Indiangrass
Indianhemp
Indianpipe
Indigo
Inkberry
Inland Muhly
Inland Rush
Intermediate Mermaidweed
Intermediate Woodfern
Interrupted Fern
Inundated Clubmoss
Ipomopsis
Iris
Irish Potato
Irisleaf Yelloweyed Grass
Ironweed
Italian Lords And Ladies
Italian Ryegrass
Itchgrass
Ivy
Ivy Buttercup
Ivyleaf Morning-glory
Ivyleaf Speedwell