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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Soderstrom, Thomas R. - Young, Stephen M.
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 70
    Date: 1983
    Page Range: 128--136
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Young, Stephen M. - Judd, Walter S.
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 79
    Date: 1992
    Page Range: 737--769
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-