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Published in Botanical Gazette, in 1913, in volume 56, issue 6, pages 490-495

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Published in Proceedings of The United States National Museum, in 1921, in volume 59, pages 667-676

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Published in Botanical Gazette, in 1922, in volume 74, issue 3, pages 314-319

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Published in Annals of the Missouri Botanical Garden, in 1938, in volume 25, pages 1-94

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