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