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  1. By: Pratt, Robertson
    Type: Article
    In: Torreya
    Volume: 36
    Issue: 6
    Date: 1936
    Page Range: 133--138
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: Pratt, Robertson
    Type: Article
    In: Torreya
    Volume: 34
    Issue: 2
    Date: 1934
    Page Range: 37--39
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945