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Published in Rhodora, in 1926, in volume 28, issue 2, pages 31-34
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Published in Journal of The Arnold Arboretum, in 1955, in volume 36, issue 2/3, pages 165-170
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Published in Phytologia, in 1948, in volume 3, issue 1, pages 1-26
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Published in Rhodora, in 1907, in volume 9, issue 101, pages 86-90
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