International Dendrological Research Institute International Dendrological Research Institute: Nonprofit organization dedicated to documenting the woody flora worldwide. (Dendrology) http://www.interdendr.org/
TreeGuide 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. (Dendrology) http://www.treeguide.com/
Forest Biology and Dendrology at Virginia Tech Forest Biology and Dendrology at Virginia Tech: Information about courses, trees, and forest biology. Includes fact sheets on over 450 species of trees. (Dendrology) http://www.cnr.vt.edu/dendro/wwwmain.html
Tree Root Architecture Tree Root Architecture: Information on research of tree root architecture, root excavation, 3D-digitising of root systems, tree root growth, tree stability, and windthrow. (Dendrology) http://www.chez.com/mdrexhage/
The American Woods 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. (Dendrology) http://www.lib.ncsu.edu/archives/forestry/hough/
Tree Matters 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. (Dendrology) http://www.treematters.freeserve.co.uk/