Northern Virginia Ecology: Organism Menu - This is an excellent site that gives a description of the tree and its uses by humans. Offers a wide variety of pictures. The greatest value is how this organism interacts with other organisms.
UConn: Plant Database - Offers descriptions to many tree that can be used in determining the habitat and niche of the tree.
USDA: Plant Fact Sheet - Offers one page descriptions of a wide variety of trees.
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