The numbers below correspond to the numbers in photo captions from frequent sources of photos. Photo use on this web site should not be understood to mean that the photos are free to use or borrow. Some may be copyrighted; please contact source for permission to re-use photos. This includes photos credited to Julie Craves or Dana Wloch (authors of this website). Contact for permission at jcraves AT umich DOT edu
[1] USDA Natural Resources Conservation Service PLANTS Database web site
[2] Center for Invasive Species and Ecosystem Health (Invasive.org)
[3] University of Wisconsin Robert W. Freckmann Herbarium
[4] Julie Craves
[5] Darrin O'Brien
[6] U.S. Forest Service Forestry Images
[7] Bioimages
[8] Dana Wloch
[9] Wikipedia
[10] Discover Life
[11] University of Missouri Extension
[12] U.S. Forest Service Woody Plants Manual
[13] Wildflower.org
