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Published in Proceedings of The American Philosophical Society, in 1869, in volume 11, issue 81, pages 419
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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1868, in volume 20, pages 305-313
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1866, in volume 18, pages 293-300
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Published in Proc. Biol. Soc. Wash, in 1945, in volume 58, pages 147-154
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Published in Botanical Gazette, in 1893, in volume 18, issue 6, pages 242
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