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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Preston, Robert E
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 57
    Date: 2010
    Page Range: 261--267
    Publication Info: Berkeley, California Botanical Society,
  2. By: Preston, Robert E
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 53
    Date: 2006
    Page Range: 46--54
    Publication Info: Berkeley, California Botanical Society,
  3. By: Preston, Robert E - Schafer, Brad D - Widdowson, Margaret
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 57
    Date: 2010
    Page Range: 242--245
    Publication Info: Berkeley, California Botanical Society,
  4. By: Preston, Robert E
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 61
    Date: 2014
    Page Range: 350--366
    Publication Info: Berkeley, California Botanical Society,