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  1. By: Simpson, D R
    Type: Article
    In: Phytologia
    Volume: 29
    Date: 1974
    Page Range: 277--280
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  2. By: Simpson, D R
    Type: Article
    In: Fieldiana
    Volume: 36
    Date: 1972
    Page Range: 1--11
    Publication Info: [Chicago], Chicago Natural History Museum, 1958-
  3. By: Simpson, D R
    Type: Article
    In: Phytologia
    Volume: 30
    Date: 1975
    Page Range: 304--316
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  4. By: Simpson, D R
    Type: Article
    In: Phytologia
    Volume: 51
    Date: 1982
    Page Range: 303--322
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  5. By: Simpson, D R
    Type: Article
    In: Phytologia
    Volume: 33
    Date: 1976
    Page Range: 4--8
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke