Trees of Illinois
Trees of Illinois Field Guide (Tree Identification Guides)
Newcomb's Wildflower Guide
Tallgrass Prairie Wildflowers: A Field Guide to Common Wildflowers and Plants of the Prairie Midwest, 2nd Edition
Birds of Indiana Field Guide
Wetland Plants of Illinois: A Complete Guide to the Wetland and Aquatic Plants of the Prairie State
Wildflowers of Illinois Woodlands
Exploring Nature in Illinois: A Field Guide to the Prairie State
Prairie Plants of the University of Wisconsin-Madison Arboretum: Including Horsetails, Ferns, Rushes, Sedges, Grasses, Shrubs, Vines, Weeds, and Wildflowers
Illinois Trees & Wildflowers: A Folding Pocket Guide to Familiar Species (Pocket Naturalist Guide Series)