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Published in Torreya, in 1941, in volume 41, issue 5, pages 145-150

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Published in Proceedings of the Biological Society of Washington, in 1921, in volume 34, pages 157-162

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Published in Proceedings of the Biological Society of Washington, in 1921, in volume 34, pages 157-162

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Published in Botanical Gazette, in 1910, in volume 49, issue 6, pages 445-452

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Published in Madroño, in 1957, in volume 14, issue 2, pages 54-73

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Published in Rhodora, in 1929, in volume 31, issue 366, pages 119

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Published in Rhodora, in 1924, in volume 26, issue 312, pages 229-231

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Published in Torreya, in 1928, in volume 28, issue 3, pages 51-53

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Published in Torreya, in 1914, in volume 14, issue 7, pages 125-127

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Published in Torreya, in 1914, in volume 14, issue 9, pages 155-159

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