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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Mitchell, W M - Hodgson, H J
    Type: Article
    In: Rhodora
    Volume: 70
    Date: 1968
    Page Range: 467--473
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Hodgson, H J
    Type: Article
    In: Rhodora
    Volume: 58
    Date: 1956
    Page Range: 144--48
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],