Tree ID

Tree identification is a useful skill for people of any age and background. All trees have different requirements. In order to know what conditions a tree requires, you must know what kind of tree it is. Knowing a tree’s requirements can help determine what tree should be planted in an area, why a particular tree may be unhealthy, or why certain trees are not found in a particular location. Tree identification is also useful in management. Decisions for planting, harvesting, thinning, conducting prescribed burns, etc., are all based on the tree species present and what the site can support. Finally, tree identification is important for communicating with others. If two people know tree characteristics and can identify species, they share a common language and can each understand what the other is trying
to communicate.


Dichotomous Tree ID Keys

A dichotomous key is a tool that can be used to identify trees or flowers, animals, rocks, fish, and more. “Dichotomous” means “divided into two parts.” Therefore, a dichotomous key will always give two choices in each step, and following all the steps will lead you to the name of the tree you’re identifying.

Online Key
Printable Winter Key

LEAF’s Printable Winter Tree ID Key (uses buds, twigs, and other features to identify Wisconsin trees)
Tips for printing the Winter Tree Identification Key:

  • Choose “Landscape” page orientation​
  • Choose “Print on both sides”
  • Legal size paper works best, though Letter will also work
  • To ensure the pages print in booklet form, be certain the paper is flipping on the short side; if the second page is printing upside down, the pages are not flipping on the short side.
Urban Tree Key

Urban Tree Key – (not dichotomous) Courtesy of the Wisconsin Department of Natural Resources – Division of Forestry

Lesson Ideas

Kevin Hall’s High School Lab :
A high school lab that Biology teacher Kevin Hall created using the LEAF Online Dichotomous Tree Key.

LEAF Field Enhancement 1 – Tree Identification :
In this lesson, students learn to use a dichotomous key to identify Wisconsin trees with LEAF’s Summer Tree ID Key.

Other Tree ID resources

American Forests’ Tree Doctor – Confused but curious about pruning? Baffled by bugs? Stumped by a tree ID? American Forests’ Tree Doctor is in and online. Send your tree-related questions to an expert at treedoc@amfor.org, and they’ll respond directly to you. 


Dichotomous Tree Key – EEK! Wisconsin Department of Natural Resources – This is the DNR’s tree ID site for kids. It utilizes descriptions and line drawings.


National Arbor Day Foundation – Detailed information on dozens of commonly planted landscape trees that grow throughout the United States as well as tree terms, forest layers, tree classification, and anatomy of tree.


National Arbor Day Foundation – Also, from the National Arbor Day Foundation, line drawings of tree leaves found throughout the U.S. and an animated “how to” identify trees guide.


Tree and Shrub Identification – Wisconsin Department of Natural Resources – Basic ID key with photos and descriptions of many Wisconsin tree species.


Trees of Wisconsin – Cofrin Center for Biodiversity – Features an on-line key and list of tree species with photos.


University of Wisconsin-Stevens Point Herbarium – An incredible collection of identification resources including photos, keys, and descriptions of natural communities, fungi, plants, and more.


UI Plants – A database on woody landscape plant identification, culture, and usage for the Midwest, including native and introduced species and their major varieties and cultivars. Search by common or scientific name. Images and information on habitat, leaves, buds, stems, flowers, fruits, fall color, bark, and culture. 

LEAF – Wisconsin’s K-12 Forestry Education Program • 1108 Fremont St. SSC 202, Stevens Point, WI 54481 • 715-346-4956 • leaf@uwsp.edu