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  1. By: Ritchie, J C
    Type: Article
    In: Rhodora
    Volume: 58
    Date: 1956
    Page Range: 321--325
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Ritchie, J C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 86
    Issue: 2
    Date: 1972
    Page Range: 184--184
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Ritchie, J C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 93
    Issue: 4
    Date: 1979
    Page Range: 457--458
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Ritchie, J C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 96
    Issue: 1
    Date: 1982
    Page Range: 118--118
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Ritchie, J C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 72
    Issue: 3
    Date: 1958
    Page Range: 147--148
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  6. By: Ritchie, J C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 103
    Issue: 4
    Date: 1989
    Page Range: 632--632
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  7. By: Ritchie, J C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 70
    Issue: 4
    Date: 1956
    Page Range: 171--181
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  8. By: Ritchie, J C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 86
    Issue: 2
    Date: 1972
    Page Range: 183--184
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  9. By: Ritchie, J C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 103
    Issue: 3
    Date: 1989
    Page Range: 470--470
    Publication Info: Ottawa Ottawa Field-Naturalists' Club