Ilihia
Illinois Bundleflower
Illinois Dewberry
Illinois Flatsedge
Illinois Greenbrier
Illinois Hawthorn
Illinois Horse-gentian
Illinois Pinweed
Illinois Pondweed
Illinois Ticktrefoil
Illinois Wart Lichen
Illinois Woodsorrel
Illosporium Lichen
Illscented Wakerobin
Illyrian Cottonthistle
Imberis Woodyaster
Imbricate Lorentziella Moss
Imbricate Phacelia
Imbricate Wattle
Imbricate Wreath Lichen