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.
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.
TreeWeb: The Natural History of Trees The TreeWeb is devoted to the natural history of trees, including their biology, evolution, geography and utilization. Descriptions of tree families, genera and species are included.
