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Published in Journal of the Arnold Arboretum, in 1982, in volume 63, pages 327-336

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Published in Journal of the Arnold Arboretum, in 1982, in volume 63, pages 375-386

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Published in Journal of the Arnold Arboretum, in 1982, in volume 63, pages 357-373

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Published in Journal of the Arnold Arboretum, in 1986, in volume 67, pages 143-185

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Published in Journal of the Arnold Arboretum, in 1983, in volume 64, pages 383-424

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Published in Madroño, in 1986, in volume 33, issue 4, pages 278-283

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Published in Journal of the Arnold Arboretum, in 1987, in volume 68, pages 137-183

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Published in Journal of the Arnold Arboretum, in 1984, in volume 65, pages 5-55

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Published in Proceedings of The Biological Society of Washington, in 1934, in volume 47, pages 91-92

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Published in The Canadian Entomologist, Ontario, in 1880, in volume 12, pages 148-152

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Published in Copeia, in 1917, in volume 47, pages 74-76

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Published in Rhodora, in 1964, in volume 66, pages 406-07

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Published in Journal of Raptor Research, in 1989, in volume 23, issue 3, pages 108-110

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Published in Rhodora, in 1976, in volume 78, pages 761-766

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Published in Rhodora, in 1965, in volume 66, issue 767, pages 278-279

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Published in Rhodora, in 1963, in volume 65, issue 761, pages 50-55

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Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 2, pages 309-314

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Published in Contributions From The University of Michigan Herbarium, in 1972, in volume 9, issue 4, pages 359-484

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Published in Proceedings of The American Philosophical Society, in 1912, in volume 51, issue 204, pages 103-117

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Published in Biol Bull, in 1957, in volume 112, pages 241-248

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Published in Novon, in 2002, in volume 12, pages 249-252

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