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Published in Torreya, in 1906, in volume 6, issue 12, pages 249-250
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Published in Asa Gray correspondence. Senders Ca-Cl, in 1897, pages 1
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Published in Pacific Science, in 1967, in volume 21, issue 4, pages 503-522
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Published in Phytologia, in 1983, in volume 52, issue 5, pages 349-361
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Published in Western Australian Naturalist, in 1979, in volume 14, issue 6, pages 165-168
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Published in Rhodora, in 1919, in volume 21, issue 252, pages 217-218
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Published in Madroño, in 1975, in volume 23, issue 1, pages 24-40
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