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By: Thomson, Paul M. - Mohlenbrock, Robert HType: ArticleIn: Journal of the Arnold ArboretumVolume: 60Series:Issue: 3Date: 1979Page Range: 350--366Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-Subjects:
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By: Thomson, Paul M.Type: ArticleIn: RhodoraVolume: 79Series:Issue:Date: 1977Page Range: 453--464Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]Subjects: