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  1. By: Stewart, W G
    Type: Article
    In: Rhodora
    Volume: 80
    Date: 1978
    Page Range: 587--590
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Britton, Donald M. - Stewart, W G - Cody, William J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 99
    Issue: 3
    Date: 1985
    Page Range: 380--382
    Publication Info: Ottawa Ottawa Field-Naturalists' Club