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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ehrle, Elwood B
    Type: Article
    In: Rhodora
    Volume: 60
    Date: 1958
    Page Range: 7--9
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Ehrle, Elwood B
    Type: Article
    In: Rhodora
    Volume: 62
    Date: 1960
    Page Range: 95--97
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],