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By: Torres-Colín, Leticia - Torres Colín, Rafael - Ramírez de Anda, Miriam P. - Mcdonald, J AndrewType: ArticleIn: Journal of the Botanical Research Institute of TexasVolume: 2Series:Issue:Date: 2008Page Range: 793--797Publication Info: Fort Worth, Tex Botanical Research Institute of Texas 2007-Subjects: