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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Clarkson, Quentin D
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 15
    Date: 1959
    Page Range: 115--122
    Publication Info: Berkeley, California Botanical Society,
  2. By: Clarkson, Quentin D
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 14
    Date: 1958
    Page Range: 246--247
    Publication Info: Berkeley, California Botanical Society,