Answer
Hi. There are tons of resources out there on the web. For example, here's a list of all plant species and common names by county in Illinois. http://www.fs.fed.us/ne/delaware/ilpin/il_cntylist.html Here's another list of plants for sale with lots of good wildflowers http://www.prairiefrontier.com/pages/natvpgs/nativeabc.html Here's a good link for the USA http://plants.usda.gov/ Some of my favorites: Blue Flag - Iris virginica Butterfly Weed - Asclepias tuberosa Little Ladies' Tresses - Spiranthes tuberosa Great Angelica - Angelica atropurpurea Obedient Plant - Physostegia viginiana Cardinal Flower - Lobelia cardinalis