Indiana Native Plant and Wildflower Society
Promoting the appreciation, conservation, beauty, diversity, and environmental importance of indigenous vegetation.
www.inpaws.org
Guide to the Wildflowers of Twin Swamps Nature Preserve
Created to help people identify the many wildflowers that grow in the preserve, which is in the southwest tip of Indiana, where the Wabash River flows into the Ohio.
www.usi.edu/science/biology/TwinSwamps/Wildflowers_of_Twin_Swamps.htm