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  1. By: Johnson, Leigh A - Gowen, David
    Type: Article
    In: PhytoKeys
    Volume: 91
    Date: 2017
    Page Range: 39-83
    Publication Info: Pensoft Publishers 2017
  2. By: Gowen, David
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 55
    Date: 2008
    Page Range: 82--87
    Publication Info: Berkeley, California Botanical Society,
  3. By: Gowen, David
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 7
    Issue: 1
    Date: 2013
    Page Range: 21--24
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-