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  1. By: Wipff, J. K. - Lonard, Robert I - Jones, Stanley D., - Hatch, Stephan L
    Type: Article
    In: SIDA, contributions to botany
    Volume: 15
    Date: 1993
    Page Range: 405--413
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  2. By: Lonard, Robert I - Gould, Frank W
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 22
    Date: 1974
    Page Range: 217--230
    Publication Info: Berkeley, California Botanical Society,