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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Thorne, James H - Morgan, Brian J - Kennedy, Jeffery A
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 55
    Date: 2008
    Page Range: 223--237
    Publication Info: Berkeley, California Botanical Society,
  2. By: Morgan, Brian J
    Type: Article
    In: Arnoldia
    Volume: 69
    Issue: 1
    Date: 2011
    Page Range: 14--22
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University