- Tree Root Architecture - Information on research of tree root architecture, root excavation, 3D-digitising of root systems, tree root growth, tree stability, and windthrow.
- International Dendrological Research Institute - Nonprofit organization dedicated to documenting the woody flora worldwide.
- 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.
- 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.
- Forest Biology and Dendrology at Virginia Tech - Information about courses, trees, and forest biology. Includes fact sheets on over 450 species of trees.
- The American Woods - Wood sections of 350 North American trees from the 14-volume book The American Woods, published between 1888 and 1910 by Romeyn Beck Hough.
- The Ancient Bristlecone Pine - Dedicated to the oldest-known living tree, growing in the White Mountains in east central California. Information about the location, dendrochronology, photo gallery, and bibliography.
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