Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 2, pages 251-259
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Published in Journal of The Arnold Arboretum, in 1967, in volume 48, issue 2, pages 152-158
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Published in Rhodora, in 1960, in volume 62, issue 735, pages 81-84
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Published in Journal of The Arnold Arboretum, in 1968, in volume 49, issue 4, pages 502-508
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Published in Journal of The Arnold Arboretum, in 1965, in volume 46, issue 3, pages 362-365
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Published in Journal of The Arnold Arboretum, in 1963, in volume 44, issue 1, pages 60-80
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Published in Journal of the Arnold Arboretum, in 1968, in volume 49, pages 278-279
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Published in Journal of the Arnold Arboretum, in 1966, in volume 47, pages 293-300
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Published in Journal of the Arnold Arboretum, in 1963, in volume 44, pages 462-501
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Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 346-357
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Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 439-463
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Published in Journal of the Arnold Arboretum, in 1966, in volume 47, pages 60-74
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Published in Journal of the Arnold Arboretum, in 1965, in volume 46, pages 48-67
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Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 206-234
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Published in Journal of the Arnold Arboretum, in 1961, in volume 42, pages 321-333
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Published in Journal of the Arnold Arboretum, in 1962, in volume 43, pages 359-375
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Published in Journal of the Arnold Arboretum, in 1962, in volume 43, pages 80-93
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Published in Journal of the Arnold Arboretum, in 1962, in volume 43, pages 1-22
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Published in Journal of the Arnold Arboretum, in 1965, in volume 46, pages 286-307
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Published in Journal of the Arnold Arboretum, in 1962, in volume 43, pages 173-186
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Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 76-79
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Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 36-75
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Published in The Auk, in 1892, in volume 9, pages 173
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Published in The Auk, in 1892, in volume 9, pages 322-329
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Published in Contributions in Science, in 1959, in volume 31, pages 1-47
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Published in Proceedings of The United States National Museum, in 1892, in volume 15, pages 27-28
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Published in Sida, Contributions To Botany, in 1998, in volume 18, issue 1, pages 356-358
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