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Forestry

Recognize these leaves?

The species shown here represent many of the genera, or kinds, of trees in the United States.

All these leaves make food for the tree, and leaf shape is important. For example, the narrow needles of a Douglas fir can expose as much as three acres of chlorophyll surface to the sun. The lobes, leaflets and jagged edges of many broad leaves have their uses, too. They help evaporate the water used in food-building, reduce wind resistance--even provide "drip tips" to shed rain that, left standing, could decay the leaf.
 

Red alder White ash Quaking aspen Baldcypress American basswood
Beech Paper birch Box elder Butternut Northern catalpa
Black cherry Eastern redcedar Northern white-cedar Kentucky coffee tree Eastern cottonwood
Flowering dogwood American elm Balsam fir Douglas fir Ginkgo
Hackberry Hawthorn Eastern hemlock Shagbark hickory American holly
American hornbeam Horse-chestnut Rocky mountain juniper California laurel Black locust
Honeylocust Southern magnolia Sugar maple Red mulberry White oak
Osage-orange Cabbage palmetto Pecan Persimmon Eastern white pine
Balsam poplar Eastern redbud Redwood Sassafras Giant sequoia
Red spruce Sweetbay Sweetgum American sycamore Tamarack
Tuliptree Black tupelo Black walnut Black willow Pacific yew

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