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  1. By: Peterson, Paul M. - Soreng, Robert John, - Styer, David - Neubauer, Dylan - Morgan, Randall - Yadon, Vern
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 5
    Date: 2011
    Page Range: 421--426
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-
  2. By: Stromberg, Mark R - Kephart, Paul - Yadon, Vern
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 48
    Date: 2001
    Page Range: 236--252
    Publication Info: Berkeley, California Botanical Society,