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Published in Madroño, in 1977, in volume 24, issue 1, pages 24-29
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Published in Annals of the Missouri Botanical Garden, in 1932, in volume 19, pages 429-496
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Published in Nautilis, in 1942, in volume 56, pages 61-62
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Published in Botanical Gazette, in 1914, in volume 57, issue 1, pages 32-52
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Published in Madroño, in 1948, in volume 9, issue 8, pages 233-238
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Published in Sida, Contributions To Botany, in 1978, in volume 7, issue 3, pages 304
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Published in The Auk, in 1914, in volume 31, pages 112-113
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