Tree Identification Websites

Trees of the Pacific Northwest
Oregon State University gives a key to common conifers in the Pacific Northwest
http://www.orst.edu/instruct/for241

Tree Identification from Hillview School
A first tutorial for the budding dendrologist.
http://www.sd22.bc.ca/hillview/treeid.html

Tree identification from Iowa State
Start using a dichotomous key by identifying major Iowa tree species.
http://www.exnet.iastate.edu/Pages/tree/

A simple key to tree ID
A different type of key.
http://www.facstaff.bucknell.edu/abrahmsn/bi330/keys/lewisbg.html

Tree Identification by Tom Simmons
This site offers instruction on markers used for the purpose of identification.
http://www.america.net/~toms/ident.htm

What tree is it?
This site helps you identify a tree by name, leaf, or fruit.
http://www.oplin.lib.oh.us/OHS2/tree/index.html

Dendrology Pages
Now that you know what your tree is, use this site to find it.
http://dcwi.com/~wench/dendrology.html

The Virtual Foliage Home Page
This site is probably the most definitive spot to find a tree picture on the Internet.
http://www.wisc.edu/botany/virtual.html

A gazillion links to plant sites!
You can spend all day on this site.  Use this as a gateway to finding plant sites.
http://dec1.vsz.cz/~holubova/plants.htm