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  1. By: Lei, Simon A - Walker, Lawrence R
    Type: Article
    In: The Great Basin naturalist
    Volume: 57
    Issue: 2
    Date: 1997
    Page Range: 155--162
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,
  2. By: Vanier, Cheryl H - Walker, Lawrence R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 46
    Date: 1999
    Page Range: 46--48
    Publication Info: Berkeley, California Botanical Society,