Rangeland Ecology & Management
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Tree
A woody perennial, usually single stemmed plant that has a definite crown shape and reaches a mature height of at least 16 feet (5 meters). There is no clearcut distinction between trees and shrubs. Some plants, such as oaks (Quercus spp.) may grow as either trees or shrubs.
Source
Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.