- Forest Biology and Dendrology at Virginia Tech
Information about courses, trees, and forest biology. Includes fact sheets on over 450 species of trees.
- International Dendrological Research Institute
Nonprofit organization dedicated to documenting the woody flora worldwide.
- Tree Matters
Site for The Dendrologist, a quarterly magazine. Also contains tree tips and a record of the dates of upcoming dendrology events in the UK.
- Tree Root Architecture
Information on research of tree root architecture, root excavation, 3D-digitising of root systems, tree root growth, tree stability, and windthrow.
- TreeGuide
Includes information about almost all North American trees, with brief descriptions, range maps, and a few images. Brief family summaries for trees from elsewhere. List of state and provincial trees.
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