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Published in Biol Bull, in 1939, in volume 77, pages 233-257

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Published in Madroño, in 1947, in volume 9, issue 4, pages 133-135

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Published in Madroño, in 1979, in volume 26, issue 3, pages 140-144

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Published in Annals of the Missouri Botanical Garden, in 1969, in volume 56, pages 475-476

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