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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pireh, W - Tyrl, Ronald J.
    Type: Article
    In: Rhodora
    Volume: 82
    Date: 1980
    Page Range: 361--367
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Phillippi, Ann - Tyrl, Ronald J.
    Type: Article
    In: Rhodora
    Volume: 81
    Date: 1979
    Page Range: 345--361
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Prather, L Alan - Tyrl, Ronald J. - Warde, William D
    Type: Article
    In: SIDA, contributions to botany
    Volume: 16
    Date: 1995
    Page Range: 447--458
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-