British Trees (Popularity: )
http://www.british-trees.com Guide to the native trees of Britain, plus links to other web resources on forestry and conservation of British Native trees, including forest conservation organizations.
TreeGuide (Popularity: )
http://www.treeguide.com/ Includes information about almost all North American trees, with brief descriptions, range maps, and a few images. Brief family summaries for trees from elsewhere. List of state and provincial trees.