- Basics of Tree ID
- Presents details and insights on identifying trees by type, leaf, bark, fruit, twig, and form.
- FOR 141 and 241
- Introductory courses on tree identification at Oregon State University.
- Identifying Trees Grown in Britain
- Information and guides on the process of identifying broad-leaved genera, conifers, and other groups of trees found in Britain.
- Key to Leaves of Virginia Trees
- Illustrated guide to identifying Virginia trees through leaf attributes or descriptions.
- Luidp-Trees
- Easy-to-use tree identification online tool. Identifies a tree by searching for attributes and common names in a number of languages.
- Natural Resource Skills - Tree Identification
- Features a tree identification lecture, leaf test, and guides to various tree types.
- Tree Leaf Key
- Simplified guide to identifying fifty common Native North American trees. Also offers a beginner tree identification e-course.
- Tree-Identification.com
- Definition of a tree and details on identifying trees through a number of means. Also includes information on tree evolution, benefits, and problems.
- UI Plants
- Database on identifying woody landscape plants. Includes data on native and introduced species.
- What Tree Is It?
- Online guide facilitates the identification of trees by leaf, fruit, and name.
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