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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Clark, Robert Brown,
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 29
    Date: 1942
    Page Range: 155--182
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Clark, Robert Brown,
    Type: Article
    In: Arnoldia
    Volume: 32
    Issue: 3
    Date: 1972
    Page Range: 133--135
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University