Donald E. Davis Arboretum - Auburn University
http://www.auburn.edu/academic/cosam/arboretum/collections/alabama native plants/

Alabama Plant Atlas- Alabama Herbarium Consortium & The University of West Alabama
http://www.floraofalabama.org/Default.aspx

Alabamaplants.com
http://wwwalabamaplants.com/

Lady Bird Johnson Wildflower Center
http://www.wildflower.org/collections/collection.php?collection=AL

Missouri Botanical Gardens Plant Finder
http://www.missouribotanicalgarden.org/plantfinder/plantfindersearch.aspx