Published in Journal of The Arnold Arboretum, in 1936, in volume 17, issue 1, pages 38-41

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Published in Torreya, in 1918, in volume 18, issue 4, pages 74-75

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Published in Sida, Contributions To Botany, in 1976, in volume 6, issue 4, pages 284-310

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Published in Phytologia, in 1975, in volume 31, issue 3, pages 241-245

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Published in American Malacological Bulletin, in 2007, in volume 23, issue 1, pages 191-194

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Published in American Fern Journal, in 1976, in volume 66, pages 113-115

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Published in Biol Bull, in 1956, in volume 111, pages 248-268

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Published in Nautilis, in 1938, in volume 51, pages 142-143

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Published in The Wilson Bulletin, in 1974, in volume 86, issue 4, pages 344-356

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Published in Proceedings of The United States National Museum, in 1907, in volume 33, pages 547-571

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Published in Annals of the Missouri Botanical Garden, in 1941, in volume 28, pages 409-491

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Published in Madroño, in 1981, in volume 28, issue 3, pages 159-162

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Published in Phytologia, in 1977, in volume 37, issue 5, pages 449-450

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Published in Madroño, in 1990, in volume 37, issue 3, pages 195-199

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Published in Biol Bull, in 1969, in volume 136, pages 288-300

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Published in Rhodora, in 1967, in volume 69, issue 777, pages 51-4

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Published in Jour Washington Acad Sci, in 1939, in volume 29, pages 1-14

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Published in Phytologia, in 1976, in volume 33, issue 4, pages 296-302

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Published in Rhodora, in 1919, in volume 21, issue 241, pages 24

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Published in The Auk, in 1895, in volume 12, pages 70-71

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Published in The Auk, in 1892, in volume 9, pages 398-399

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Published in Pacific Science, in 1951, in volume 5, issue 4, pages 291-297

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Published in Rhodora, in 1956, in volume 58, issue 690, pages 160-161

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Published in Madroño, in 1980, in volume 27, issue 3, pages 138-145

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Published in The Wilson Bulletin, in 1972, in volume 84, issue 2, pages 119-135

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Published in Novon, in 2001, in volume 11, pages 360-365

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Published in Annals And Magazine of Natural History, in 1864, in volume 13, pages 184

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Published in Phytoneuron, in 2014, in volume 2014-57, pages 1-12

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Published in Memoirs of the Queensland Museum, in 1945, in volume 12, issue 3, pages 134-135

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Published in Rhodora, in 1920, in volume 22, issue 262, pages 167-168

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Published in Botanical Gazette, in 1893, in volume 18, issue 5, pages 183-186

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Published in Botanical Gazette, in 1919, in volume 68, issue 3, pages 208-221

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Published in Journal of The New York Entomological Society, in 1936, in volume 44, issue 2, pages 124

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Published in The Great Basin Naturalist, in 1990, in volume 50, issue 4, pages 313-319

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Published in Phytologia, in 1972, in volume 24, issue 1, pages 15-18

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Published in Phytologia, in 1974, in volume 28, issue 1, pages 21-23

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Published in The Great Basin Naturalist, in 1982, in volume 42, pages 413-414

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Published in Phytologia, in 2008, in volume 90, pages 41-46

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Published in Phytologia, in 1984, in volume 56, pages 55-60

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Published in Novon, in 2004, in volume 14, pages 365-371

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Published in Entomological News, in 1953, in volume 64, pages 201-204

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Published in Rhodora, in 1962, in volume 64, issue 757, pages 87-91

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Published in Phytologia, in 1998, in volume 84, issue 6, pages 385-388

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