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  1. By: Kondratieff, Boris C - Okane, S L - Schaal, Barbara A.
    Type: Article
    In: Rhodora
    Volume: 95
    Date: 1993
    Page Range: 254--260
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Schaal, Barbara A. - Learn, Gerald H
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 75
    Date: 1988
    Page Range: 1207--1216
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-