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Published in Transactions of the South African Philosophical Society, in 1903, in volume 14, issue 1, pages 66-75
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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 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 1913, in volume 52, issue 212, pages 606-615
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Published in Transactions of the Royal Society of South Africa, in 1910, in volume 2, issue 1, pages 79-82
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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 Rhodora, in 1972, in volume 74, issue 797, pages 154
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Published in Annals of Tropical Medicine & Parasitology, in 1924, in volume 18, issue 3, pages 267-322
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Published in The Wilson Bulletin, in 1967, in volume 79, issue 3, pages 339
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Published in Proceedings of The American Philosophical Society, in 1912, in volume 51, issue 206, pages 269
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