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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Barnes, Burton V.
    Type: Article
    In: Rhodora
    Volume: 63
    Date: 1961
    Page Range: 311--324
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Barnes, Burton V.
    Type: Article
    In: Rhodora
    Volume: 69
    Date: 1967
    Page Range: 70--81
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],