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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Clifton, Glenn L. - Buck, Roy E. - Hill, Steven R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 56
    Date: 2009
    Page Range: 285--292
    Publication Info: Berkeley, California Botanical Society,
  2. By: Clifton, Glenn L. - Buck, Roy E.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 54
    Date: 2007
    Page Range: 94--98
    Publication Info: Berkeley, California Botanical Society,