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  1. By: Reveal, James L. - York, Dana Adrian - Helliwell, Richard
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 3
    Date: 2009
    Page Range: 639--643
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-
  2. By: Helliwell, Richard
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 4
    Date: 2010
    Page Range: 7--11
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-
  3. By: Christy, John A. (John Ashton), - Helliwell, Richard - Zika, Peter F.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 38
    Date: 1991
    Page Range: 204--205
    Publication Info: Berkeley, California Botanical Society,