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  1. By: Barbour, Michael G - De Jong, Theodore M - Johnson, Ann F
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 23
    Date: 1975
    Page Range: 130--134
    Publication Info: Berkeley, California Botanical Society,
  2. By: Johnson, Ann F - Blyth, Amelie C.,
    Type: Article
    In: SIDA, contributions to botany
    Volume: 13
    Date: 1988
    Page Range: 137--140
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-