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

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Published in Torreya, in 1936, in volume 36, issue 2, pages 37-40

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Published in Annals of the Missouri Botanical Garden, in 1990, in volume 77, pages 110-117

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Published in The Wilson Bulletin, in 2000, in volume 112, issue 4, pages 505-509

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Published in Biol Bull, in 1947, in volume 93, pages 114-121

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Published in Biol Bull, in 2002, in volume 203, pages 338-346

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Published in Annals of the Missouri Botanical Garden, in 1931, in volume 18, pages 509-540

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Published in Annals of the Missouri Botanical Garden, in 1981, in volume 68, pages 524-526

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Published in Iheringia Serie Zoologia, in 1998, in volume 85, pages 67-73

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Published in Acta Botánica Mexicana, in 2013, in volume 103, pages 1-9

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Published in Phytologia, in 2016, in volume 98, issue 4, pages 241-249

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Published in Psyche: A Journal of Entomology, in 1959, in volume 66, issue 1-2, pages 1-12

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Published in Acta Botánica Mexicana, in 2001, in volume 55, pages 1-5

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Published in Sida, Contributions To Botany, in 1996, in volume 17, issue 2, pages 423-435

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