The following websites have excellent images to use and are free of charge:

http://calphotos.berkeley.edu/

http://www.invasive.org/weeds.cfm

http://tncweeds.ucdavis.edu/photos.html

http://ontariotrees.com/index.php

http://www.cas.vanderbilt.edu/bioimages/frame.htm

http://gallery.cs.umb.edu/gallery/main.php

http://www.eflora.bc.ca/

http://plants.ifas.ufl.edu/node/22

http://www.biodiversity.sk.ca/database/search.htm

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