I should have mentioned: the programs are for trees and wildflowers in
the U.S. and Canada east of the Rockies. Sorry, left-coasters.

Eric Haines wrote:
With Spring here, I decided to make a few little improvements to my free
wildflower and tree identification programs:

http://www.realtimerendering.com/trees/trees.html for trees
http://www.realtimerendering.com/flowers/flowers.html for wildflowers