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  1. By: Razifard, Hamid - Tucker, Gordon C. (Gordon Charles), - Ahart, Lowell - Les, Donald
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 63
    Issue: 1
    Date: 2016
    Page Range: 3--4
    Publication Info: Berkeley, California Botanical Society,
  2. By: Zika, Peter F. - Janeway, Lawrence P - Wilson, Barbara L - Ahart, Lowell
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 7
    Issue: 1
    Date: 2013
    Page Range: 25--35
    Publication Info: Fort Worth, Tex Botanical Research Institute of Texas 2007-