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W. John Kress displays the Leafsnap app on his iPhone along with tree leaf specimens at the Smithsonian Natural History Museum's specimen storage room in Washington. The free app "is going to be able to populate a database of every tree in the United States," he said. "I mean that's millions and millions and millions of trees, so that would be really neat." (Associated Press)

W. John Kress displays the Leafsnap app on his iPhone along with tree leaf specimens at the Smithsonian Natural History Museum's specimen storage room in Washington. The free app "is going to be able to populate a database of every tree in the United States," he said. "I mean that's millions and millions and millions of trees, so that would be really neat." (Associated Press)

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