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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Downie, Stephen R - Palmer, Jeffrey D
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 79
    Date: 1992
    Page Range: 266--283
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Spalik, Krzysztof - Downie, Stephen R
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 88
    Date: 2001
    Page Range: 270--301
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-