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Science, engineering, and mathematics — biology, chemistry, physics, astronomy, earth sciences, social sciences, and technology research. A curated gateway to academic and professional scientific resources.
57129 resources
Links on woody plant taxonomy including original identification keys to major genera.
A quick leaf guide for identification of over 50 common North American trees.
Tree identification. Especially useful way to work from the shapes of leaves.
Provides information about the general identification of trees as well as more specific techniques for a limited number of species. Includes information about dendrology.
Offers software which identifies northern forest trees. Includes details of the trees covered and an FAQ.
Descriptions, illustrations, US range maps and cultivation of species from around the world.
Includes ID keys and fact sheets on over 900 species of wild and cultivated trees in North America.