Links to Other Oregon and West Coast
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The site I visit most often is:UC Berkeley Digital Photo Library It is generally designed for users who know either the scientific name or the common name of the plant though it does have a menu option for browsing.
Another site I visit almost as often is:Burke Museum Image Collection at the Univ. of Wash. I'm able to easily bring up image pages for any genus they have listed. There is a thumbnail for each species and most species have a short description of the leaves, flowers, etc.
The following link leads to a page that could be used to identify likely plant families (from a set of 400+ families) by checking the appropriate items in a list of 180 plant features. Be sure to check the appropriate continent at the bottom of the list.
If you find this link useful, you may want to download a Windows program that provides similar functionality.