In 2019, the key moved to the new Natural Resources Stewardship site. Deciduous trees drop their leaves in the fall while coniferous trees keep their needles year-round, except for tamarack which drops its needles in the fall. Deciduous trees have leaves and covered seeds. Coniferous trees have needles and seeds in cones. In 2011, Claudette Sandoval-Green built upon the original design, relocated the tree identification key within ISU Forestry Extension's web site, and updated the content and graphics under the direction of Dr. The first step in identifying a tree is determining whether it is coniferous or deciduous.
Paul Wray, Professor Emeritus, at the Department of Natural Resource and Ecology and Management was the source for most of the original content for these web pages. Many times the steps can be retraced to this point and the sample can be identified.Īcknowledgements: Some of the pictures on these web pages are from USDA's Natural Resources Conservation Service Trees and Shrubs Pocket Guide, The Sibley Guide to Trees, and Forestry Images. If at the end, the solution does not match the specimen, one can usually identify a point in the process where the choice of direction was in doubt. One must always choose the best route which matches the characteristics of the tree. The proper use of the key may be compared to the use of road signs where a choice of two directions must be made at each intersection. It does not include all trees grown in Iowa. Check out our definition of special terms page to learn more about the characteristics you'll see in the key.
The key is based on vegetative characteristics such as leaves, twigs, fruits, and bark. This interactive dichotomous tree key was developed to help identify the most common trees in Iowa.
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