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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Riggins, Rhonda
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 35
    Date: 1988
    Page Range: 92--104
    Publication Info: Berkeley, California Botanical Society,
  2. By: Riggins, Rhonda - Goodrich, Sherel - Henderson, Douglass - Cholewa, Anita F - Caicco, Steven L. - Civille, Janie - Brunsfeld, Steven J. - Lackschewitz, Klaus
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 30
    Date: 1983
    Page Range: 63--65
    Publication Info: Berkeley, California Botanical Society,