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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hilsenbeck, Richard A
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 36
    Date: 1989
    Page Range: 198--207
    Publication Info: Berkeley, California Botanical Society,
  2. By: Ralston, Barbara E. - Hilsenbeck, Richard A
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 39
    Date: 1992
    Page Range: 281--284
    Publication Info: Berkeley, California Botanical Society,