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By: Albert, Victor A - Backlund, Anders - Bremer, Kåre, - Chase, Mark W., - Manhart, James R - Mishler, Brent D - Nixon, Kevin CType: ArticleIn: Annals of the Missouri Botanical GardenVolume: 81Series:Issue:Date: 1994Page Range: 534--567Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-Subjects: