About.com - A Tree Leaf Key (Popularity:  )
A quick leaf guide for identification of over 50 common North American trees.
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About.com: Top 100 Trees (Popularity: )
Find information on more than 100 trees in North America
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Ariadne's Trees and Forests (Popularity: )
Glossary of tree-related terms; articles on California trees, hiking, and meditation.
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Bartosz Pacula's Pictures of Trees (Popularity: )
Large photo gallery of cultivated and wild trees in Europe.
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Basics of Tree ID (Popularity: )
A basic guide to identifying trees. Describes leaves, fruits, barks, with many images.
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British Trees (Popularity: )
Guide to the native trees of Britain, plus links to other web resources on forestry and conservation of British Native ...
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Catalog of the Woody Plants of Oklahoma (Popularity: )
Descriptions, images, and range maps.
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Common Trees of Pennsylvania (Popularity: )
Guide to common trees with laymans descriptions of each tree, and a simple key to start with. Line drawings of ...
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Conifers in the Pacific Northwest (Popularity: )
A site that covers common conifers only. Uses an interactive web based dichotomous key.
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Dendrology at Virginia Tech (Popularity: )
Includes ID keys and fact sheets on over 450 species of wild and cultivated trees in the eastern USA.
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Fact Sheets for 680 Trees (Popularity: )
Descriptions, illustrations, US range maps, and cultivation of cultivated species from around the world.
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Foliage Identification Test (Popularity: )
An interactive guide to identifying trees and shrubs of Ontario. Image intensive.
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Forest Biology and Dendrology at Virginia Tech (Popularity: )
Information about courses, trees, and forest biology. Includes fact sheets on over 450 species of trees.
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Forest Trees of Florida (Popularity: )
Descriptions and images of over 70 species.
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Goo's Tree Encyclopedia (Popularity: )
Names and illustrations of Japanese trees.
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Identification of Common Trees of Iowa (Popularity: )
An interactive guide to trees, using a simple visual dichotomous key.
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Identifying Trees of Michigan (Popularity: )
A page on the common trees of Michigan with a key.
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International Dendrological Research Institute (Popularity: )
Nonprofit organization dedicated to documenting the woody flora worldwide.
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Introduction to Tree Identification (Popularity: )
A resource for beginners and others. Includes a collection of descriptive graphics showing leaves, and buds, with notes.
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Palm Tree Photo Gallery (Popularity: )
Over a thousand photographs of palms from around the world.
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