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Our illustrated, step-by-step process makes it easy to identify a tree by its leaves. Begin identifying by choosing your tree's region below.
We inspire people to plant, nurture, and celebrate trees. The Arbor Day Foundation is a 501(c)(3) nonprofit conservation and education organization. A million members, donors, and partners support our programs to make our world greener and healthier.
The Arbor Day Foundation trees site offers complete resources for planting, pruning, identifying, care of, and information about trees. Plant the right tree in the right place.
What Tree Is That? is a tree identification guide from the Arbor Day Foundation, featuring an easy-to-use, step-by-step process to identify nearly any tree in North America.
Our tree guide offers extensive information on tree height and spread, soil and sunlight needs, leaf characteristics, historical background, wildlife habitat, and much more. Find detailed information about nearly 200 different tree species. Learn the different layers of a tree and why each is important.
Browse the Tree Database. Learn about more than 200 trees and shrubs. Entries are listed alphabetically by common name. Click on another category heading to sort the list alphabetically by that category.
Explore the breakdown of how trees are classified and the definitions of various tree terms, from acid to xeriscape.
Leaves. Leaves carry out photosynthesis, making food for the tree and releasing oxygen into the air. And this tells us much about their shapes. For example, the narrow needles of a Douglasfir can expose as much as three acres of chlorophyll surface to the sun.
The head of foliage of a tree or shrub. This is the form or shape of the tree. deciduous A tree that shed all leaves annually. entire A leaf margin with smooth, untoothed edges. evergreen A tree with needles or leaves that remain alive and on the tree through the winter and into the next growing season. exfoliate
Students collect leaves and work as individuals, then as teams, to identify the trees in their sampling area. Class data is pooled to allow simple calculations of rarity indices for the various tree species.