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  1. By: Ringius, Gordon S
    Type: Article
    In: Phytologia
    Volume: 62
    Issue: 5
    Date: 1987
    Page Range: 432
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  2. By: Ringius, Gordon S
    Type: Article
    In: The Canadian field-naturalist
    Volume: 93
    Issue: 3
    Date: 1979
    Page Range: 326--328
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Ringius, Gordon S
    Type: Article
    In: The Canadian field-naturalist
    Volume: 94
    Issue: 2
    Date: 1980
    Page Range: 110--120
    Publication Info: Ottawa Ottawa Field-Naturalists' Club