About.com - A Tree Leaf Key - A quick leaf guide for identification of over 50 common North American trees.
Bartosz Pacula's Pictures of Trees - Large photo gallery of cultivated and wild trees in Europe.
Basics of Tree ID - A basic guide to identifying trees. Describes leaves, fruits, barks, with many images.
Dendrology at Virginia Tech - Includes ID keys and fact sheets on over 450 species of wild and cultivated trees in the eastern USA.
Fact Sheets for 680 Trees - Descriptions, illustrations, US range maps, and cultivation of cultivated species from around the world.
Foliage Identification Test - An interactive guide to identifying trees and shrubs of Ontario. Image intensive.
Introduction to Tree Identification - A resource for beginners and others. Includes a collection of descriptive graphics showing leaves, and buds, with notes.
Palm Tree Photo Gallery - Over a thousand photographs of palms from around the world.
Plant Kaleidoscope - Large image gallery of cultivated woody plants in Europe.
SelecTree for California - A tree database for California. Includes non native trees.
Taxonomy of Woody Plants - Links on woody plant taxonomy including original identification keys to major genera.
Twig Identification Test - Interactive identification of leafless twigs and axillary buds. For the trees and shrubs of Ontario.
What Tree is it? - Tree identification. Especially useful way to work from the shapes of leaves.
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