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  1. By: Albert, Victor A - Backlund, Anders - Bremer, Kåre, - Chase, Mark W., - Manhart, James R - Mishler, Brent D - Nixon, Kevin C
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 81
    Date: 1994
    Page Range: 534--567
    Publication Info: St. Louis :Missouri Botanical Garden Press,1914-