By Region - Musharof Chy
The Tree Register of the British Isles
Historical, ancient, and biggest trees of Great Britain and Ireland.
Conifers in the Pacific Northwest
A site that covers common conifers only. Uses an interactive web based dichotomous key.
About.com: Top 100 Trees
Find information on more than 100 trees in North America
Catalog of the Woody Plants of Oklahoma
Descriptions, images, and range maps.
Ariadne's Trees and Forests
Glossary of tree-related terms; articles on California trees, hiking, and meditation.
Identify America’s Common Trees
Provides quick identification of 100 common conifer and evergreen trees of the North American fores...
SelecTree for California
A tree database for California. Includes non native trees.
Trees of London
Tree identification using examples of trees located in London. Illustrated with photographs of tree...
Trees, Shrubs, and Woody Vines of North Carolina
Photographs and information on over 450 species, identification key, and full species list for the ...
British Trees
Guide to the native trees of Britain, plus links to other web resources on forestry and conservatio...