Cost: Free 4th Grade, 6th Grade, 7th Grade, 8th Grade
This free mobile app uses visual recognition software to help identify tree species from photographs of their leaves.
Leafsnap contains beautiful high-resolution images of leaves, flowers, fruit, petiole, seeds, and bark. Leafsnap currently includes the trees of the Northeast and will soon grow to include the trees of the entire continental United States.
Take picture of a leaf with the device and this app will identify the type of leaf.