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By: Reveal, James L. - York, Dana Adrian - Helliwell, RichardType: ArticleIn: Journal of the Botanical Research Institute of TexasVolume: 3Series:Issue:Date: 2009Page Range: 639--643Publication Info: Fort Worth, Tex Botanical Research Institute of Texas 2007-Subjects:
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By: Helliwell, RichardType: ArticleIn: Journal of the Botanical Research Institute of TexasVolume: 4Series:Issue:Date: 2010Page Range: 7--11Publication Info: Fort Worth, Tex Botanical Research Institute of Texas 2007-Subjects:
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By: Christy, John A. (John Ashton), - Helliwell, Richard - Zika, Peter F.Type: ArticleIn: Madroño; a West American journal of botanyVolume: 38Series:Issue:Date: 1991Page Range: 204--205Publication Info: Berkeley California Botanical SocietySubjects: