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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Lortie, J P - Sorrie, Bruce A. - Holt, D W
    Type: Article
    In: Rhodora
    Volume: 93
    Date: 1991
    Page Range: 361--389
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Royte, Joshua L. - Lortie, J P
    Type: Article
    In: Rhodora
    Volume: 102
    Date: 2000
    Page Range: 210--213
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],