Published in Rhodora, in 1947, in volume 50, issue 590, pages 38-49

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Published in Rhodora, in 1972, in volume 74, issue 800, pages 495-516

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Published in Acta Botánica Mexicana, in 2010, in volume 91, pages 1-7

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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 Contributions from the University of Michigan Herbarium, in 1993, in volume 19, pages 207-239

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Published in Contributions from the University of Michigan Herbarium, in 1982, in volume 15, pages 191-196

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Published in Rhodora, in 1938, in volume 40, issue 472, pages 175-177

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Published in Annals of the Missouri Botanical Garden, in 1965, in volume 52, pages 399-409

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Published in Contributions From The University of Michigan Herbarium, in 1966, in volume 9, issue 1, pages 1-123

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Published in Madroño, in 1958, in volume 14, issue 6, pages 214-216

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Published in Contributions From The University of Michigan Herbarium, in 1980, in volume 14, pages 141-152

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Published in Contributions From The University of Michigan Herbarium, in 1972, in volume 9, issue 5, pages 485-493

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Published in Contributions From The University of Michigan Herbarium, in 1972, in volume 9, issue 6, pages 495-506

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Published in Rhodora, in 1936, in volume 38, issue 452, pages 276-298

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Published in Rhodora, in 1936, in volume 38, issue 453, pages 305-329

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Published in Contributions from the University of Michigan Herbarium, in 1978, in volume 11, issue 5, pages 298-300

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Published in Contributions from the University of Michigan Herbarium, in 1978, in volume 11, issue 5, pages 305-309

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Published in Madroño, in 1946, in volume 8, issue 7, pages 237-240

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Published in Contributions from the University of Michigan Herbarium, in 1990, in volume 17, pages 307-312

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Published in Contributions from the University of Michigan Herbarium, in 1978, in volume 11, issue 5, pages 277-280

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Published in Contributions from the University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 57-63

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Published in Contributions from the University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 65-68

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Published in Contributions from the University of Michigan Herbarium, in 1972, in volume 9, issue 7, pages 507-522

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Published in Field Museum Publications in Botany, in 1958, in volume 13, issue 4, pages 569-818

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Published in Sida, Contributions To Botany, in 1994, in volume 16, issue 1, pages 207

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Published in Novon, in 1997, in volume 7, pages 14-16

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Published in Contributions From The University of Michigan Herbarium, in 1995, in volume 20, pages 173-215

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Published in Contributions From The University of Michigan Herbarium, in 1978, in volume 11, issue 5, pages 289-290

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Published in Contributions From The University of Michigan Herbarium, in 2005, in volume 24, pages 127-171

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Published in Palaeontology, in 1990, in volume 33, issue 3, pages 613-622

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Published in Rhodora, in 1968, in volume 70, issue 783, pages 439-441

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Published in Torreya, in 1922, in volume 22, issue 4, pages 61-63

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Published in Novon, in 2000, in volume 10, pages 67-70

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Published in Nautilis, in 1941, in volume 54, pages 75-77

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Published in Phytologia, in 1979, in volume 41, issue 7, pages 447-448

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Published in Madroño, in 1949, in volume 10, issue 4, pages 108-110

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Published in Entomological News, in 1957, in volume 68, pages 85-88

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Published in Rhodora, in 1998, in volume 100, issue 904, pages 380-441

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Published in Madroño, in 1995, in volume 42, issue 2, pages 123-126

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Published in Madroño, in 1975, in volume 23, issue 3, pages 153-159

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

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Published in Contributions From The University of Michigan Herbarium, in 1978, in volume 11, issue 5, pages 284-288

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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 Sida, Contributions To Botany, in 1979, in volume 8, issue 2, pages 215-216

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Published in The Auk, in 1917, in volume 34, pages 337

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Published in Phytologia, in 1974, in volume 27, issue 6, pages 440

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