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By: Crow, Garrett E. - Countryman, William D. - Church, George Lyle, - Eastman, L. M. - Hellquist, C B - Mehrhoff, L L - Storks, I MType: ArticleIn: RhodoraVolume: 83Series:Issue:Date: 1981Page Range: 259--299Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],Subjects: