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Published in Journal of The Arnold Arboretum, in 1946, in volume 27, issue 4, pages 355-360
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Published in Botanical Gazette, in 1876, in volume 2, issue 1, pages 54-55
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Published in Botanical Gazette, in 1898, in volume 25, issue 6, pages 427-436
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Published in Madroño, in 1939, in volume 5, issue 4, pages 105-119
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