Virginia Tech has a web site for their Dendrology class that should be very helpful to anyone wanting information on North American trees. There are several sections, but these look to be the most useful:
A searchable database in which you can find information on a tree by entering its scientific or common name: http://www.cnr.vt.edu/dendro/dendrology/factsheets.cfm
A map-based database in which you can find information on which trees grow in which states or provinces: http://www.cnr.vt.edu/dendro/LandownerF ... /index.htm
A dichotomous key that can identify a tree from a leaf or a twig: http://www.cnr.vt.edu/dendro/dendrology/idit.htm
Lots of photos on the tree pages and information on water and sunlight requirements, value to wildlife, etc.
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