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  1. By: Penneys, Darin S - Jost, Lou
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 60
    Series: 4
    Issue: 6
    Date: 2009
    Page Range: 69--72
    Publication Info: San Francisco California Academy of Sciences
  2. By: Penneys, Darin S - Judd, Walter S.
    Type: Article
    In: SIDA, contributions to botany
    Volume: 20
    Date: 2003
    Page Range: 877--884
    Publication Info: [Dallas W. F. Mahler, etc.] 1962-