In 2019, the key moved to the new Natural Resources Stewardship site. 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. 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. The list of trees with oppositely-arranged leaves and branches is a much shorter list than their alternate counterparts. 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. Also known as Alnus rubra, its Latin name, this deciduous tree can be identified by oval-shaped leaves with serrated edges and a defined tip, as well as rust-red bark. This interactive dichotomous tree key was developed to help identify the most common trees in Iowa. When it comes to the most common North American trees, the red alder is number one.
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