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  1. By: Duvall, Melvin R - Noll, Jeffrey D - Larson, Gary E
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 46
    Date: 1999
    Page Range: 199--204
    Publication Info: Berkeley, California Botanical Society,
  2. By: Larson, Gary E
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 4
    Date: 2010
    Page Range: 467--470
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-