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By: Barghoorn, Elso S. (Elso Sterrenberg), - Wolfe, Margaret K - Clisby, Kathryn HType: ArticleIn: Botanical Museum leaflets, Harvard UniversityVolume: 16Series:Issue: 9Date: 1954-07-12Page Range: 229--240Publication Info: Cambridge, Mass Botanical Museum, Harvard University 1932-Subjects: