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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Riba, R
    Type: Article
    In: Rhodora
    Volume: 71
    Date: 1969
    Page Range: 7--17
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Riba, R
    Type: Article
    In: Rhodora
    Volume: 69
    Date: 1967
    Page Range: 65--68
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],