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By: Beals, A. T. - Graves, Arthur H - Smiley, Daniel, - Melo-Costa, Wanessa de - Thomas, W S - Small, John AType: ArticleIn: TorreyaVolume: 39Series:Issue: 1Date: 1939Page Range: 18--24Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945Subjects: