Butterflies of North America This fabulous website by the Northern state except Alaska including a County by County distribution map. This site provides color photos of the butterfly in all stages of life as well as lists of larval host plants and adult nectar plants.
http://www.OurOhio.org - The Ohio Farm Bureau established the Our Ohio brand as a means of encouraging the public to purchase food and products raised locally.
Prairie Nursery Sells native plants and has a very informative catalog on native plants and the wildlife attracted to them.
USEPA Green Acres Gives excellent native plants lists. Their website has great links to other native plant sites such as Landscaping with Native Plants, Great Lakes plants and the Wild Ones Handbook.
WE-DU Nurseries Sells many native plants.Check out their wildflower lists.
Wild Ones Offers the Wild Ones Handbook and good links to other native plant sites.