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By: Alexander, Patrick J - Douglas, Norman A - Ochoterena, Helga - Flores-Olvera, Hilda - Moore, Michael JType: ArticleIn: Journal of the Botanical Research Institute of TexasVolume: 8Series:Issue: 2Date: 2014Page Range: 383--393Publication Info: Fort Worth, Tex Botanical Research Institute of Texas 2007-Subjects: