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  1. By: Harms, Vernon L - Hudson, J H - Heilmanternier, J
    Type: Article
    In: Rhodora
    Volume: 82
    Date: 1980
    Page Range: 239--280
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Hudson, J H
    Type: Article
    In: The Canadian field-naturalist
    Volume: 65
    Issue: 6
    Date: 1951
    Page Range: 197--210
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Harms, Vernon L - Hudson, J H
    Type: Article
    In: Rhodora
    Volume: 76
    Date: 1974
    Page Range: 39--44
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]