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  1. By: Ungar, Irwin A.
    Type: Article
    In: Rhodora
    Volume: 73
    Date: 1971
    Page Range: 548--551
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Khan, M Ajmal - Ungar, Irwin A.
    Type: Article
    In: The Great Basin naturalist
    Volume: 59
    Issue: 2
    Date: 1999
    Page Range: 144--150
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,
  3. By: Ungar, Irwin A.
    Type: Article
    In: Rhodora
    Volume: 78
    Date: 1976
    Page Range: 143--144
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Ungar, Irwin A.
    Type: Article
    In: Rhodora
    Volume: 70
    Date: 1968
    Page Range: 450--451
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],