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  1. By: St. John, Harold, - Herbst, Derral R
    Type: Article
    In: Phytologia
    Volume: 30
    Issue: 1
    Date: 1975
    Page Range: 7--8
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  2. By: Herbst, Derral R
    Type: Article
    In: Phytologia
    Volume: 45
    Issue: 1
    Date: 1980
    Page Range: 67--81
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke