Tree Root Architecture (Popularity:  )
Information on research of tree root architecture, root excavation, 3D-digitising of root systems, tree root growth, tree stability, and windthrow.
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International Dendrological Research Institute (Popularity: )
Nonprofit organization dedicated to documenting the woody flora worldwide.
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TreeGuide (Popularity: )
Includes information about almost all North American trees, with brief descriptions, range maps, and a few images. Brief family summaries ...
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Tree Matters (Popularity: )
Site for The Dendrologist, a quarterly magazine. Also contains tree tips and a record of the dates of upcoming dendrology ...
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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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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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Foliage Identification Test (Popularity: )
An interactive guide to identifying trees and shrubs of Ontario. Image intensive.
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Twig Identification Test (Popularity: )
Interactive identification of leafless twigs and axillary buds. For the trees and shrubs of Ontario.
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Taxonomy of Woody Plants (Popularity: )
Links on woody plant taxonomy including original identification keys to major genera.
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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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What Tree is it? (Popularity: )
Tree identification. Especially useful way to work from the shapes of leaves.
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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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SelecTree for California (Popularity: )
A tree database for California. Includes non native trees.
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Palm Tree Photo Gallery (Popularity: )
Over a thousand photographs of palms from around the world.
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Plant Kaleidoscope (Popularity: )
Large image gallery of cultivated woody plants in Europe.
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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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About.com - A Tree Leaf Key (Popularity: )
A quick leaf guide for identification of over 50 common North American trees.
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Trees and Shrubs of Ontario (Popularity: )
Designed to assist those interested in learning some of the common trees and shrubs found in the province.
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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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