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Published in Veliger, in 1977, in volume 19, pages 331-340
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Published in Journal of The Arnold Arboretum, in 1941, in volume 22, issue 1, pages 60-80
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Published in Journal of The Arnold Arboretum, in 1941, in volume 22, issue 3, pages 343-374
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Published in Journal of The Arnold Arboretum, in 1941, in volume 22, issue 2, pages 231-252
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Published in Rhodora, in 1954, in volume 56, issue 671, pages 242-252
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Published in Pacific Science, in 1964, in volume 18, issue 1, pages 34-40
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Published in Phytologia, in 1996, in volume 81, issue 1, pages 44-45
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Published in Journal of The Arnold Arboretum, in 1942, in volume 23, issue 3, pages 366-368
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Published in Journal of The Arnold Arboretum, in 1944, in volume 25, issue 2, pages 222-270
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Published in Journal of The Arnold Arboretum, in 1945, in volume 26, issue 2, pages 169-179
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