Plant Edu
This is just a short list of a few tools, articles and other resources on the web I found helpful. If you have links you think should be included in this list please let me know or leave in comments.
Edible Wild Plant bibliography by Russ Cohen
Excellent list of book titles on foraging and wild edible plants.
Botany and Horticulture (Morphology)
Plant parts, structure and function
Horticultural Basics and Plant ID
Plant families from the author of Botany in a Day
Plant Morphology chart and terminology
Trees
Tree Identification from Michigan State University
Excellent resource for tree huggers 
Tree ID at ArborDay.org
Dendrology at Virginia Tech
Everything about trees.
Additional Resources A smattering of books and video at Amazon for foraging and wildcrafting.
