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By: Carlsen, Tor - Bleeker, Walter - Hurka, Herbert - Elven, Reidar, - Brochmann, ChristianType: ArticleIn: Annals of the Missouri Botanical GardenVolume: 96Series:Issue: 2Date: 2009Page Range: 215--236Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-Subjects: