A website titled Eastern Colorado Wildflowers is at http://www.easterncoloradowildflowers.com/ . He site contains photographs of wildflowers described in Weber and Wittman's Colorado Flora: Eastern Slope. Currently, the site includes about 300 species, but coverage will expand each year.
For the southwestern portion of Colorado, http://www.swcoloradowildflowers.com is even more extensive and contains valuable descriptions of the species.
