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By: Wiens, Delbert - Rourke, John P - Casper, Brenda B - Rickart, Eric A. - LaPine, Timothy R - Peterson, C Jeanne - Channing, AlanType: ArticleIn: Annals of the Missouri Botanical GardenVolume: 70Series:Issue:Date: 1983Page Range: 1--31Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-Subjects: