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  1. By: Crawford, Daniel J. - Gardner, Robert Carl
    Type: Article
    In: SIDA, contributions to botany
    Volume: 5
    Date: 1974
    Page Range: 292--294
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  2. By: Gardner, Robert Carl
    Type: Article
    In: Rhodora
    Volume: 79
    Date: 1977
    Page Range: 139--146
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Gardner, Robert Carl
    Type: Article
    In: Rhodora
    Volume: 81
    Date: 1979
    Page Range: 291--343
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Gardner, Robert Carl
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 22
    Date: 1974
    Page Range: 239--265
    Publication Info: Berkeley, California Botanical Society,