Iguana Hackberry
Illinois Bundleflower
Illinois Flatsedge
Illinois Pondweed
Incised Agrimony
Indian Blanket
Indian Breadroot
Indian Goosegrass
Indian Hedgemustard
Indian Heliotrope
Indian Jointvetch
Indian Lovegrass
Indian Mallow
Indian Paintbrush
Indian Parsley
Indian Plantain
Indian Ricegrass
Indian Rushpea
Indian Shot
Indian Strawberry
Indian Swampweed
Indian Valley False Mallow
Indian Woodoats
Indiangrass
Indianhemp
Indianola Beaksedge
Indianpipe
Indigo
Indigoberry
Inflated Narrow-leaf Sedge
Inflatedscale Flatsedge
Inkberry
Inland Bluegrass
Inland Muhly
Inland Rush
Interior Ironweed
Intermediate Cliffbrake
Intermediate Needle And Thread
Intermediate Pepperweed
Intermediate Wheatgrass
Iodanthus
Iodinebush
Ipomopsis
Irion County Buckwheat