Iberian Geranium
Ice Cold Buttercup
Icegrass
Icelandic Poppy
Idaho Bentgrass
Idaho Blue-eyed Grass
Idaho Buttercup
Idaho Fescue
Idaho Licorice-root
Illinois Bundleflower
Illinois Pondweed
Indian Blanket
Indian Breadroot
Indian Goosegrass
Indian Lovegrass
Indian Mallow
Indian Milkvetch
Indian Paintbrush
Indian Parsley
Indian Potato
Indian Ricegrass
Indian Rushpea
Indiangrass
Indianhemp
Indianpipe
Inland Bluegrass
Inland Gooseberry
Inland Rush
Inland Sedge
Interior Ironweed
Intermediate Barley
Intermediate Fishhook Cactus
Intermediate Needle And Thread
Intermediate Pepperweed
Intermediate Wheatgrass
Intermountain Clover
Intermountain Indian Breadroot
Intermountain Lupine
Intermountain Phacelia
Intermountain Rubberweed
Introduced Sage
Iowa Moonwort
Ipomopsis
Iris